Expedition 324 Thin Sections, Site U1349

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Site U1349 core descriptions Thin sections around the rim hematite is present as patches in the groundmass OBSERVER:THIN SECTION:TS205 OBSERVER:THIN lacirehps yletaredom lacirehps esalcoigalp lardehbus50.0x50.01.0x1.0 ralucica10.0x1.010.0x51.0 elcisev elcisev ssalg vesicle plagioclase Unit:5 4.2 8 SIZE(mm) min. max. mode. REPLACING/FILLING COMMENTS 04 0 100 001 04 06 04 51 01 02 amygdules or vesicles. Some irregular veins connected to amygdules. Plagioclase microlites concentrated around amygdules or vesicles. Some irregular veins connected to amygdules. Alteration Degree: 81%; 20%; Crystallinity: 27%; Aphyric Hyalophytic Basalt; Microcrystalline; Lower part of lava flow; Vesicularity Vein Filling: None; Vesicle Filling: Calcite, brown clays and orange clays; Structure: Plagioclase microlites concentrated around Filling: None; Vesicle Vein 75 aphyric basalt microcrystalline [324] aphyric,hyalophytic PERCENTORIGINAL REL. VOL. REPLACED SIZE(mm) min. max. mode. MORPHOLOGY COMMENTS COMMENTS SUMMARY calcite STRUCTURE brown clays orange clays brown clays SECONDARY brown clays MINERALOGY hematite glass plagioclase DESCRIPTION GROUNDMASSopaque Minerals 100 THIN SECTION: 324-U1349A-7R-1-W 65_67-TS205 Piece No: VESICLES WHERE SAMPLED:GRAINSIZE: TEXTURE: lower part of flow PRIMARY MINERALOGY PHENOCRYSTSMICROPHENOCRYST 0 ROCK NAME: U1349A-7R-1,65-67 cm, TS 205

Proc. IODP | Volume 324 1 Site U1349 core descriptions Thin sections stnemgarf citlasab yb dellif yb citlasab stnemgarf 2 types of sediments + one layer glass shards overlain by calcite OBSERVER:THIN SECTION:TS206 OBSERVER:THIN yticirehps wol yticirehps esalcoigalp lardehbus1.0x1.01.0x2.0 lardehbus1.0x1.01.0x2.0 lardehbus4.0x5.08.0x8.0 enexoryp ralucica50.0x1.050.0x5.0 enivilo ssalg vesicle Unit:4 6 01 SIZE(mm) min. max. mode. REPLACING/FILLING COMMENTS 001 03 04 0 100 001 001 03 04 51 03 glass shards; Structure: Thick composite vein of rock fragments cemented by calcite/clay. glass shards; Structure: 83%; Vein Filling: Fibrous calcite and 2 layers of sediments and glass shards within calcite; Vesicle Filling: Sediment and altered Filling: Fibrous calcite and 2 layers of sediments glass shards within calcite; Vesicle 83%; Vein Some veins and amygdules filled with sedimentary materials or calcite. Calcite are polycrystaline syntaxal. 5 5 75 99 1 aphyric basalt microcrystalline [324] intersertal,aphyric PERCENTORIGINAL REL. VOL.0 REPLACED SIZE(mm) min. max. mode. MORPHOLOGY COMMENTS 324-U1349A-7R-1-W 112_115-TS206 Piece No: STRUCTURE sediment and altered glass shards COMMENTS DESCRIPTIONSUMMARY Alteration Degree: 30%; Crystallinity: 26%; Aphyric Intersertal Basalt; Microcrystalline; Lower part of inflated lava flow; Vesicularity brown clays brown clays iddingsite SECONDARY MINERALOGY orange-brown clays glass pyroxene opaque Minerals GROUNDMASS plagioclase VESICLES WHERE SAMPLED:GRAINSIZE: TEXTURE: PRIMARY Lower part of inflated flow MINERALOGY PHENOCRYSTS MICROPHENOCRYST olivine ROCK NAME: THIN SECTION: U1349A-7R-1,112-115 cm, TS 206

Proc. IODP | Volume 324 2 Site U1349 core descriptions Thin sections r ion OBSERVER:THIN SECTION:TS207 OBSERVER:THIN Alteration of vitric and lithic clasts vesicles in lithic clasts Unit:5 olivine glass plagioclase vesicle 10 2 moderately spherical filled by sediments 0.8x0.8 0.5x0.3 subhedral 0.3x0.02 0.15x0.02 acicular 0.15x0.15 0.05x0.05 subhedral SIZE(mm) min. max. mode. REPLACING/FILLING COMMENTS 100 100 40 0 Degree: 94%; Vein Filling: None; Vesicle Filling: Calcite; Structure: Frotty texture. Amygdules and connected amygdules (vein o Filling: Calcite; Structure: Frotty texture. Filling: None; Vesicle Degree: 94%; Vein aphyric basalt middle part of vesicular basalt flow microcrystalline [324] aphyric,hyalophytic PERCENTORIGINAL REL. VOL.0 REPLACED SIZE(mm) min.1 75 99 max.0.1 90 10 mode. MORPHOLOGY100 100 40 COMMENTS Amygdules and connected amygdules (vein or pipe) filled with calcite sedimentary materials. Aphyric Hyalophytic Basalt; Microcrystalline; Middle part of vesicular lava flow; Vesicularity 75%; Crystallinity: 11%; Alterat 75%; Crystallinity: 11%; Aphyric Hyalophytic Basalt; Microcrystalline; Middle part of vesicular lava flow; Vesicularity pipe) filled with calcite or sedimentary materials. ROCK NAME: THIN SECTION:WHERE SAMPLED: GRAINSIZE: 324-U1349A-7R-2-W 29_33-TS207TEXTURE: PRIMARY MINERALOGY Piece No: PHENOCRYSTS MICROPHENOCRYST olivine VESICLES GROUNDMASS opaque Minerals glass plagioclase SECONDARY MINERALOGY iddingsite brown clays brown clays calcite STRUCTURE COMMENTS SUMMARY DESCRIPTION U1349A-7R-2, 29-33 cm, TS 207 cm, 29-33 U1349A-7R-2,

Proc. IODP | Volume 324 3 Site U1349 core descriptions Thin sections places where reddish oxidized fluides OBSERVER:THIN SECTION:TS208 OBSERVER:THIN layering of the sediment in vesicle pyroxenes are relatively well-preserved in at the interface between sediment and calcite Unit:6 glass pyroxene olivine vesicle vesicle subhedral plagioclase vesicle 100.2x0.10.05x0.05 4 0.1x0.05 0.02x0.02 subhedral 0.4x0.02 0.3x0.02 low sphericity acicular 0.5x0.5 0.5x0.5 subhedral SIZE(mm) min. max. mode. REPLACING/FILLING COMMENTS 70 0 100 90 100 aphyric basalt middle part of vesicular basalt flow very fine grained intersertal,aphyric PERCENTORIGINAL REL. VOL.0 REPLACED SIZE(mm) min.0.1 30 100 max.10 10 40 mode.40 MORPHOLOGY100 COMMENTS 70 100 5 80-100 Some irregular calcite veins penetrated through groundmass and amygdules. No structure in groundmass. 15 Degree: Alteration 30%; Crystallinity: 60%; fine grained; Middle part of vesicular lava flow; Vesicularity Aphyric Intersertal Basalt; Very veins penetrated through groundmass and amygdules. No structure in groundmass. 83%; Vein Filling: None; Vesicle Filling: Majority of carbonate sediment, with some zeolite and calcite; Structure: Some irregular calcite Filling: Majority of carbonate sediment, with some zeolite and calcite; Structure: Some irregular Filling: None; Vesicle 83%; Vein ROCK NAME: iddingsite carbonate sediment opaque Minerals THIN SECTION:WHERE SAMPLED: GRAINSIZE: 324-U1349A-7R-2-W 78_81-TS208TEXTURE: PRIMARY MINERALOGY Piece No: PHENOCRYSTS MICROPHENOCRYST olivine VESICLES GROUNDMASS pyroxene glass plagioclase SECONDARY MINERALOGY orange-brown claysorange-brown clays brown clays 90 Mn-oxides? calcite zeolite STRUCTURE COMMENTS SUMMARY DESCRIPTION U1349A-7R-2, 78-81 cm, TS 208 cm, 78-81 U1349A-7R-2,

Proc. IODP | Volume 324 4 Site U1349 core descriptions Thin sections selcisev eht dnuora mir sa mir dnuora eht selcisev ssamdnuorg yradnoces OBSERVER:THIN SECTION:TS209 OBSERVER:THIN lacirehps yletaredom lacirehps esalcoigalp lardehbus1.0x1.01.0x1.0 lardehbus5.0x6.05.0x8.0 ralucica20.0x1.020.0x2.0 elcisev elcisev elcisev enivilo enivilo Unit:8 2 51 SIZE(mm) min. max. mode. REPLACING/FILLING COMMENTS 001 08 0 100 001 001 001 1.0 1.0 09 01 08 01 06 (amygdules). No structure in groundmass. Some shear vesicles (amygdules). No structure in groundmass. Alteration 60%; Crystallinity: 10%; Aphyric Hyalophytic Basalt; Microcrystalline; Middle part of vesicular lava flow; Vesicularity Degree: 98%; Vein Filling: None; Vesicle Filling: All calcite (A) or zeolites and orange clays (B); Structure: Some shear vesicles All calcite (A) or zeolites and orange clays (B); Structure: Some shear vesicles Filling: Filling: None; Vesicle Degree: 98%; Vein 90 aphyric basalt microcrystalline [324] hyalophytic,aphyric PERCENTORIGINAL REL. VOL. REPLACED SIZE(mm) min. max. mode. MORPHOLOGY COMMENTS COMMENTS SUMMARY STRUCTURE zeolites orange clays calcite iddingsite DESCRIPTION iddingsite SECONDARY MINERALOGY orange clays opaque Minerals GROUNDMASSglass 100 plagioclase VESICLES THIN SECTION: 324-U1349A-7R-3-W 39_43-TS209 Piece No: WHERE SAMPLED:GRAINSIZE: TEXTURE: middle part of vesicular basalt flow PRIMARY MINERALOGY PHENOCRYSTSMICROPHENOCRYST olivine 0 ROCK NAME: U1349A-7R-3,39-43 cm, TS 209

Proc. IODP | Volume 324 5 Site U1349 core descriptions Thin sections elcisev eht dnuora mir sa mir dnuora eht elcisev OBSERVER:THIN SECTION:TS210 OBSERVER:THIN yticirehps wol yticirehps esalcoigalp lardehbus1.0x1.02.0x2.0 lardehbus3.0x6.06.0x8.0 enexoryp ralucica50.0x1.050.0x3.0 elcisev elcisev enivilo ssalg ssalg subhedral Unit:9 20.0x50.050.0x50.0 2 6 SIZE(mm) min. max. mode. REPLACING/FILLING COMMENTS 001 08 04 04 100 001 02 08 04 08 01 01 09 02 91%; Vein Filling: None; Vesicle Filling: Calcite and yellowish-green clay; Structure: Subophitic structure. Thin, irregular and syntaxic Filling: Calcite and yellowish-green clay; Structure: Subophitic structure. Filling: None; Vesicle 91%; Vein Aphyric Intersertal Basalt; Microcrystalline; Middle part of vesicular lava flow; Vesicularity 20%; Crystallinity: 24%; Alteration Degree: 20%; Crystallinity: 24%; Aphyric Intersertal Basalt; Microcrystalline; Middle part of vesicular lava flow; Vesicularity 100 Thin, irregular and syntaxic veins are heterogeneously distributed connect amygdules. Subophitic structure. veins are heterogeneously distributed and connect amygdules. 5 78 7 3 aphyric basalt microcrystalline [324] aphyric,intersertal PERCENTORIGINAL REL. VOL. REPLACED SIZE(mm) min. max. mode. MORPHOLOGY COMMENTS COMMENTS SUMMARY STRUCTURE yellowish-green clay iddingsite calcite light green clay light green clay calcite DESCRIPTION SECONDARY iddingsite MINERALOGY light yellow clay glass plagioclase pyroxene GROUNDMASSopaque Minerals 97 VESICLES olivine WHERE SAMPLED:GRAINSIZE: TEXTURE: middle part of vesicular basalt flow PRIMARY MINERALOGY PHENOCRYSTSMICROPHENOCRYST 0 THIN SECTION:ROCK NAME: 324-U1349A-7R-3-W 111_113-TS210 Piece No: U1349A-7R-3,111-113 cm, TS 210

Proc. IODP | Volume 324 6 Site U1349 core descriptions Thin sections contain fibrous brown clay seperated by a layer contain Fe some vesicles are calcite free and there are two generations of calcite fill opaques oxyhydroxide, zeolite and rare OBSERVER:THIN SECTION:TS211 OBSERVER:THIN lacirehps yletaredom lacirehps esalcoigalp lardehbus2.0x4.04.0x6.0 etitengam ralucica20.0x1.020.0x2.0 elcisev elcisev elcisev elcisev elcisev enivilo ssalg Unit:10 2 7 SIZE(mm) min. max. mode. REPLACING/FILLING COMMENTS 001 04 100 ecart ecart 001 001 03 03 07 02 04 01 07 trace trace Most of vesicles (amygdules) elongated to approximately 30 60-degree west. Alteration Degree: 94%; Vein 70%; Crystallinity: 11%; Aphyric Intersertal Basalt; Microcrystalline; Middle part of flow; Vesicularity 90 Most of vesicles (amygdules) elongated. Thin calcite irregular vein penetrats both amygdules and groundmass. Most of vesicles (amygdules) elongated. 1 Filling: Calcite and brown clay; Vesicle Filling: Calcite, zeolite, Fe-oxyhydroxide, opaques (A) or calcite, brown clay (B); Structure: Filling: Calcite and brown clay; Vesicle aphyric basalt microcrystalline [324] aphyric,intersertal PERCENT REL. VOL. SIZE(mm) ORIGINAL REPLACED min. max. mode. MORPHOLOGY COMMENTS COMMENTS SUMMARY brown clay STRUCTURE Fe oxyhydroxide calcite opaque calcite zeolite brown clay Fe oxyhydroxide brown clay white clay glass SECONDARY MINERALOGY iddingsite DESCRIPTION GROUNDMASSplagioclase 99 VESICLES THIN SECTION: 324-U1349A-7R-4-W 32_35-TS211 Piece No: WHERE SAMPLED:GRAINSIZE: TEXTURE: middle part of sheet flow PRIMARY ROCK NAME: MINERALOGY PHENOCRYSTSMICROPHENOCRYST olivine 0 U1349A-7R-4,32-35 cm, TS 211

Proc. IODP | Volume 324 7 Site U1349 core descriptions Thin sections decslaoc emoslacirehps yletaredom emoslacirehps decslaoc and rock tabular zeolite which could be phillipsite as rim around the vesicle uniform in size growing at the interface between calcite OBSERVER:THIN SECTION:TS214 OBSERVER:THIN esalcoigalp la rdehbus elcisev elcisev ssalg vesicle Unit:14 6.0 2 0.02x0.2 acicular 4 SIZE(mm) min. max. mode. REPLACING/FILLING COMMENTS 001 100 95 001 1.0 89 59 06 elongated to the oblique direction core. Filling: None; Vesicle Filling: Calcite and minor zeolite and a trace of orange-yellow clays; Structure: Vesicules (amygdules) are Filling: Calcite and minor zeolite a trace of orange-yellow clays; Structure: Vesicules Filling: None; Vesicle 2 (amygdules) are elongated to the oblique direction core. Vesicules Alteration Degree: 99%; Vein 60%; Crystallinity: 20%; Aphyric Intersertal Basalt; Microcrystalline; Highly vesicular flow; Vesicularity 80 20 aphyric basalt microcrystalline [324] aphyric,intersertal PERCENTORIGINAL REL. VOL. REPLACED SIZE(mm) min. max. mode. MORPHOLOGY COMMENTS COMMENTS SUMMARY zeolite orange-yellow clay STRUCTURE calcite GROUNDMASSglass plagioclase 100 SECONDARY hematite brown orange clays MINERALOGY brown orange clays VESICLES THIN SECTION:WHERE SAMPLED:GRAINSIZE: 324-U1349A-9R-1-W 24_26-TS214TEXTURE: highly vesicular flow PRIMARY MINERALOGY Piece No: PHENOCRYSTSMICROPHENOCRYST olivine 0 ROCK NAME: DESCRIPTION U1349A-9R-1,24-26 cm, TS 214

Proc. IODP | Volume 324 8 Site U1349 core descriptions Thin sections e which could be phillipsite tiloez ralubat tiloez OBSERVER:THIN SECTION:TS215 OBSERVER:THIN yticirehps wol5.2 yticirehps esalcoigalp ra lucica1.0x20.02.0x50.0 elcisev elcisev enivilo ssalg Unit:14 01 max. mode. REPLACING/FILLING COMMENTS .n im SIZE(mm) 59 100 001 001 59 59 01 05 5 No structure. Alteration Degree: 100%; Vein 50%; Crystallinity: 10%; Aphyric Intersertal Basalt; Cryptocrystalline; Highly vesicular flow; Vesicularity Filling: None; Vesicle Filling: Calcite and minor zeolite; Structure: No structure. Filling: None; Vesicle 90 aphyric basalt cryptocrystalline aphyric,intersertal PERCENTORIGINAL REL. VOL. REPLACED SIZE(mm) min. max. mode. MORPHOLOGY COMMENTS YGOLARENIM STRUCTURE COMMENTS SUMMARY zeolite calcite orange clays glass hematite iddingsite SECONDARY brown orange clays GROUNDMASSplagioclase 100 WHERE SAMPLED:GRAINSIZE: TEXTURE: highly vesicular flow PRIMARY MINERALOGY PHENOCRYSTSMICROPHENOCRYST VESICLES 0 ROCK NAME: THIN SECTION: 324-U1349A-9R-1-W 36_40-TS215 Piece No: DESCRIPTION U1349A-9R-1,36-40 cm, TS 215

Proc. IODP | Volume 324 9 Site U1349 core descriptions Thin sections nworgretni esalcoigalp nworgretni the veins. Away from the veins both Away the veins. fresh the rock is completely altered close to pyroxene and plagioclase are relatively OBSERVER:THIN SECTION:TS216 OBSERVER:THIN ralugna ,yticirehps wol5.0 ,yticirehps ralugna esalcoigalp esalcoigalp lardehbus lardehbus lardehbus etitengam ralucica1.0x10.0 elcisev enivilo ssalg vesicle Unit:15 4. 0 4. 0 8. 0 6.0 8.0 3.1 2 SIZE(mm) min. max. mode. REPLACING/FILLING COMMENTS 001 001 05 05 100 001 001 1.0 1.0 07 05 05 01 51 02 Filling: Calcite and minor clay or partially filled with brown clay; Structure: En echelon veins. Deformed amygdules. Degree: 92%; Vein Filling: Two generations with calcite, brown clay (A) and calcite, brown clay, Fe-oxyhydroxide and opaques; Vesicle Fe-oxyhydroxide and opaques; Vesicle generations with calcite, brown clay (A) and clay, Two Filling: Degree: 92%; Vein 50 5 Amygdaloidal structure with en echelon veins, sometimes amygdules are deformed. Alteration 20%; Crystallinity: 17%; Aphyric Intersertal Basalt; Microcrystalline; Lava mingling or intrusion into vesicular lava; Vesicularity 95 85 2 aphyric basalt microcrystalline [324] aphyric,intersertal PERCENTORIGINAL REL. VOL. REPLACED SIZE(mm) min. max. mode. MORPHOLOGY COMMENTS COMMENTS SUMMARY clay STRUCTURE calcite brown clay brown clay brown clay white clay white clay Fe oxyhydroxide SECONDARY MINERALOGY iddingsite GROUNDMASSglass 98 plagioclase DESCRIPTION VESICLES olivine MICROPHENOCRYST pyroxene WHERE SAMPLED:GRAINSIZE: TEXTURE: lava intrusion to vesicular PRIMARY MINERALOGY PHENOCRYSTSolivine 0 ROCK NAME: THIN SECTION: 324-U1349A-9R-1-W 127_132-TS216 Piece No: U1349A-9R-1,127-132 cm, TS 216

Proc. IODP | Volume 324 10 Site U1349 core descriptions Thin sections rved and 0%; Alteration Degree: 78%; 0%; saponite? OBSERVER:THIN SECTION:TS217 OBSERVER:THIN olivine vesicle plagioclase glass pyroxene Unit:16 mode. MORPHOLOGY COMMENTS 0.2x0.1 0.1x0.1 subhedral max. 6 2 low sphericity 0.3x0.1 0.2x0.05 subhedral 0.8x0.8 0.6x0.4 subhedral SIZE(mm) min. max. mode. REPLACING/FILLING COMMENTS 100 10 35 100 Vein Filling: Calcite and yellow clay; Vesicle Filling: Calcite and yellow clay; Structure: Subophitic structure. Irregular, cu Filling: Calcite and yellow clay; Structure: Subophitic structure. Irregular, Filling: Calcite and yellow clay; Vesicle Vein Subophitic structure. Irregular, curved and anastomosed veins are heterogeneously distributed. Subophitic structure. Irregular, 100 35 100 10 70 324-U1349A-9R-2-W 96_98-TS217 Piece No: 10 aphyric basalt middle part of massive flow microcrystalline [324] aphyric,intersertal PERCENTORIGINAL REL. VOL.0 REPLACED SIZE(mm) min. 0.1 3 100 20 anastomosed veins are heterogeneously distributed. DESCRIPTION 3%; Crystallinity: 3 Aphyric Intersertal Basalt; Microcrystalline; Middle part of massive flow; Vesicularity Y calcite yellow clay STRUCTURE COMMENTS SUMMAR iddingsite white clays MINERALOGY yellowish clay SECONDARY hematite orange clays glass pyroxene THIN SECTION: ROCK NAME: PHENOCRYSTS VESICLES WHERE SAMPLED: GRAINSIZE: TEXTURE: PRIMARY MINERALOGY MICROPHENOCRYST olivine GROUNDMASS plagioclase U1349A-9R-2, 96-98 cm, TS 217 cm, 96-98 U1349A-9R-2,

Proc. IODP | Volume 324 11 Site U1349 core descriptions Thin sections ree: 69%; ing gentle fected by clay forming completely unaf pyroxene looks to be almost OBSERVER:THIN SECTION:TS218 OBSERVER:THIN adjacent to it vesicle glass plagioclase olivine pyroxene Unit:16 1.6x0.7 1.6x0.70.5x0.46 subhedral 0.5x0.3 subhedral 0.2x0.10.2x0.02 1.4 0.1x0.1 0.1x0.02 subhedral subhedral moderately spherical SIZE(mm) min. max. mode. REPLACING/FILLING COMMENTS 100 100 10 10 100 aphyric basalt middle part of massive flow microcrystalline [324] aphyric,intersertal PERCENTORIGINAL REL. VOL. REPLACED0.1 SIZE(mm) min. max. mode. MORPHOLOGY COMMENTS 100 Some irregular calcite veins are heterogeneously distributed having gentle dips. Subophitic structure. Alteration Deg 20%; Crystallinity: 36%; Aphyric Intersertal Basalt; Microcrystalline; Middle part of massive flow; Vesicularity 1 20 99 65 10 25 100 10 100 10 Vein Filling: Calcite; Vesicle Filling: Brown clay; Structure: Some irregular calcite veins are heterogeneously distributed hav Filling: Calcite; Vesicle Vein dips. Subophitic structure.

Y THIN SECTION:WHERE SAMPLED: GRAINSIZE: 324-U1349A-9R-3-W 6_9-TS218 TEXTURE: PRIMARY MINERALOGY PHENOCRYSTSolivine 0 COMMENTS SUMMAR ROCK NAME: brown clay STRUCTURE glass MICROPHENOCRYST olivine VESICLES GROUNDMASS pyroxene plagioclase SECONDARY MINERALOGY brown clay white clay iddingsite brown clay DESCRIPTION U1349A-9R-3, 6-9 cm, TS 218 TS 6-9 cm, U1349A-9R-3,

Proc. IODP | Volume 324 12 Site U1349 core descriptions Thin sections nity: 36%; plagioclase intergrown plagioclase intergrown OBSERVER:THIN SECTION:TS219 OBSERVER:THIN COMMENTS Unit:17 pyroxene pyroxene plagioclase vesicle vesicle 0.05x0.5 tabular 2 subangular low sphericity, (mm) SIZE (mm) SIZE 0.10.2 0.05 0.1 skeletal anhedral 55 2 subangular low sphericity, 0.6 0.4 subhedral 1.21.6 0.6 1 subhedral subhedral min. max. mode. REPLACING/FILLING COMMENTS 100 10 5 100 100 5 5 67 10 5 5 100 100 One irregular and curved vein. 20 10 20 96 3 20 1 20 sparsely pyroxene phyric basalt middle part of vesicular lava microcrystalline sparsely phyric,intersertal PERCENTORIGINAL REL. VOL. REPLACED0.1 min.3 max. mode. MORPHOLOGY 100 100 5 20%; Crystalli Sparsely Pyroxene Phyric Intersertal Basalt; Microcrystalline; Middle part of versicular lava flow; Vesicularity Alteration Degree: 68%; Vein Filling: Calcite and zeolite; Vesicle Filling: Calcite; Structure: One irregular and curved vein. Filling: Calcite and zeolite; Vesicle Alteration Degree: 68%; Vein

Y brown clay COMMENTS SUMMAR glass SECONDARY MINERALOGY iddingzite brown clay white clay brown clay Fe oxyhydroxide calcite calcite STRUCTURE plagioclase pyroxene GROUNDMASS opaque Minerals MICROPHENOCRYST olivine VESICLES THIN SECTION:WHERE SAMPLED: GRAINSIZE: 324-U1349A-10R-2-W 10_12-TS219TEXTURE: PRIMARY MINERALOGY Piece No: ROCK NAME: PHENOCRYSTSolivine pyroxene 3 DESCRIPTION U1349A-10R-2, 10-12 cm, TS 219 cm, 10-12 U1349A-10R-2,

Proc. IODP | Volume 324 13 Site U1349 core descriptions Thin sections noisulcni )m u 05-03(l enips 05-03(l u )m noisulcni nworgretni esalcoigalp nworgretni plagioclase intergrown OBSERVER:THIN SECTION:TS220 OBSERVER:THIN lardehbus la rdehbus lardehbus et itengam la rdehna50.0 enexoryp lateleks30.0 ralucica2.0x50.0 enivilo enivilo ssalg Unit:17 5.0 4.0 1 (mm) 8.0 8.0 SIZE SIZE(mm) 3 min. max. mode. REPLACING/FILLING COMMENTS 001 001 03 03 03 5 100 001 03 07 02 02 veins are network and highly curved. 30 trace Composite and polycrystalline veins are network highly curved. 0%; Crystallinity: 32%; Sparsely Olivine Phyric Intersertal Basalt; Microcrystalline; Middle part of massive lava flow; Vesicularity 5 Alteration Degree: 79%; Vein Filling: Calcite in multiple generations; Vesicle Filling: None; Structure: Composite and polycrystalline Filling: Calcite in multiple generations; Vesicle Alteration Degree: 79%; Vein 5 3 72 3 0 95 1 1 324-U1349A-10R-2-W 85_91-TS220 Piece No: sparsely olivine phyric basalt microcrystalline sparsely phyric,intersertal PERCENT REL. VOL. ORIGINAL REPLACED min. max. mode. MORPHOLOGY COMMENTS hematite STRUCTURE COMMENTS DESCRIPTION SUMMARY brown clay white clay Fe oxyhydroxide yellow clay iddingzite SECONDARY MINERALOGY brown clay glass pyroxene Opaque Minerals VESICLES GROUNDMASS plagioclase pyroxene olivine MICROPHENOCRYST THIN SECTION: ROCK NAME: WHERE SAMPLED:GRAINSIZE: TEXTURE: PRIMARY middle part of massive flow MINERALOGY PHENOCRYSTS olivine U1349A-10R-2, 85-91 cm, TS 220

Proc. IODP | Volume 324 14 Site U1349 core descriptions Thin sections ; Alteration massive calcite replaces the glass in OBSERVER:THIN SECTION:TS212 OBSERVER:THIN the groundmass and pyroxenes glass pyroxene plagioclase olivine Unit:17 0.6x0.3 0.2x0.2max. subhedral mode. REPLACING/FILLING COMMENTS 0.6x0.4 0.4x0.4 subhedral 1.40.5x0.05 0.2x0.02 1.2 acicular elongate max.2.0x0.8 mode. 1.6x0.80.8x0.3 MORPHOLOGY subhedral 0.6x0.3 subhedral COMMENTS SIZE(mm) min. 45 100 40 100 100 40 100 40 45 100 Subophitic structure. Curved and anastomosed veins are heterogeneously distributed. sparsely phyric basalt middle part of massive basalt flow very fine grained sparsely phyric,intersertal PERCENTORIGINAL REL. VOL. REPLACED SIZE(mm) min. 1 95 20 75 5 100 1%; Crystallinity: 29% fine grained; Middle part of massive flow; Vesicularity Sparsely Olivine Phyric Intersertal Basalt; Very Filling: None; Structure: Subophitic structure. Curved and anastomosed veins are Filling: Calcite; Vesicle Degree: 86%; Vein 1 2 2 heterogeneously distributed.

Y MINERALOGY SECONDARY calcite calcite calcite iddingsite iddingsite STRUCTURE COMMENTS SUMMAR ROCK NAME: WHERE SAMPLED: GRAINSIZE: TEXTURE: PRIMARY MINERALOGY VESICLES GROUNDMASS glass pyroxene plagioclase THIN SECTION: 324-U1349A-10R-2-W 106_109-TS212 Piece No: PHENOCRYSTSolivine MICROPHENOCRYST olivine 1 pyroxene DESCRIPTION U1349A-10R-2, 106-109 cm, TS 212 TS cm, 106-109 U1349A-10R-2,

Proc. IODP | Volume 324 15 Site U1349 core descriptions Thin sections nworgretni esalcoigalp nworgretni noisulcni lenips noisulcni altered glass hematite forms tiny veins through the OBSERVER:THIN SECTION:TS221 OBSERVER:THIN lardehbus lardehbus ralucica2.0x20.0 elcisev elcisev magnetite olivine glass pyroxene glass Unit:17 5.0 1 8.0 2 SIZE(mm) min. max. mode. REPLACING/FILLING COMMENTS 001 001 52 100 ecart 03 09 (B); Vesicle Filling: Brown clay with trace of zeolite; Structure: Composite and polycrystalline veins are networked conjugated. (B); Vesicle Composite and polycrystalline veins are networked conjugated. 0%; Crystallinity: 32%; Sparsely Olivine Phyric Intersertal Basalt; Microcrystalline; Middle part of massive lava flow; Vesicularity 2 0 70 Alteration Degree: 78%; Vein Filling: Two generations with calcite, brown clay and a trace of zeolite (A) calcite clay Two Filling: Alteration Degree: 78%; Vein 1 sparsely olivine phyric basalt microcrystalline [324] sparsely phyric,intersertal PERCENTORIGINAL REL. VOL. REPLACED SIZE(mm) min. max. mode. MORPHOLOGY COMMENTS COMMENTS SUMMARY SECONDARY STRUCTURE white clay brown clay zeolite MINERALOGY Fe oxyhydroxide VESICLES GROUNDMASSglass 97 iddingsite white clay brown clay brown clay hematite plagioclase MICROPHENOCRYST olivine WHERE SAMPLED:GRAINSIZE: TEXTURE: middle of massive flow PRIMARY MINERALOGY PHENOCRYSTSolivine 1 ROCK NAME: THIN SECTION: 324-U1349A-10R-3-W 43_48-TS221 Piece No: DESCRIPTION U1349A-10R-3, 43-48 cm, TS 221

Proc. IODP | Volume 324 16 Site U1349 core descriptions Thin sections OBSERVER:THIN SECTION:TS222 OBSERVER:THIN spinel inclusion olivine pyroxene olivine glass Unit:17 0.02x0.1 0.1 0.05 1.80.4 10.3 0.2 subhedral 0.1 subhedral SIZE(mm) min. max. mode. REPLACING/FILLING COMMENTS 0 100 100 100 30 90 94%; Vein Filling: None; Vesicle Filling: Calcite; Structure: Thick and thin veins are network en echelon. Filling: Calcite; Structure: Filling: None; Vesicle 94%; Vein 2 83 100 30 100 100 Thick and thin veins are network en echelon. aphyric basalt middle part of massive flow cryptocrystalline aphyric,intersertal PERCENTORIGINAL REL. VOL. REPLACED0.1 SIZE(mm) min.1 0 max.100 5 10 mode. MORPHOLOGY COMMENTS 90 Degree: Alteration 0%; Crystallinity: 18%; Aphyric Intersertal Basalt; Cryptocrystalline; Middle part of massive lava flow; Vesicularity

Y Opaque Minerals glass SECONDARY MINERALOGY iddingsite COMMENTS SUMMAR brown clays iddingsite brown clays brown clays STRUCTURE WHERE SAMPLED: GRAINSIZE: TEXTURE: PRIMARY MINERALOGY PHENOCRYSTSolivine 0 GROUNDMASS pyroxene ROCK NAME: MICROPHENOCRYST olivine VESICLES plagioclase THIN SECTION: 324-U1349A-10R-3-W 97_99-TS222 Piece No: DESCRIPTION U1349A-10R-3, 97-99 cm, TS 222 cm, 97-99 U1349A-10R-3,

Proc. IODP | Volume 324 17 Site U1349 core descriptions Thin sections altered ; OBSERVER:THIN SECTION:TS223 OBSERVER:THIN Unit:18 plagioclase olivine glass pyroxene olivine 1.20.8 0.80.40.15 0.6 subhedral 0.3 0.2 0.08 subhedral 0.15 anhedral skeletal acicular SIZE(mm) min. max. mode. REPLACING/FILLING COMMENTS 100 100 20 0 100 70 minerals in groundmass. Alteration Degree: 65%; Vein Filling: Fibrous Calcite; Vesicle Filling: None; Structure: Thin veins are network and connecting Filling: None; Structure: Filling: Fibrous Calcite; Vesicle Alteration Degree: 65%; Vein sparsely phyric basalt unit with large coalesced vesicles microcrystalline [324] sparsely phyric,intersertal PERCENTORIGINAL REL. VOL. REPLACED1 SIZE(mm) min.2 99 max.30 3 40 mode.27 MORPHOLOGY COMMENTS 70 100 70 20 100 Thin veins are network and connecting altered minerals in groundmass. 30 0%; Crystallinity: 60% Amygdaloidal Intersertal Basalt; Microcrystalline; Lava flow with large coalesced vesicles; Vesicularity

Y WHERE SAMPLED: GRAINSIZE: TEXTURE: PRIMARY MINERALOGY PHENOCRYSTSolivine 1 pyroxene ROCK NAME: MICROPHENOCRYST olivine GROUNDMASS opaque Minerals glass plagioclase SECONDARY MINERALOGY clays COMMENTS SUMMAR iddingsite calcite clays iddingsite white clays STRUCTURE THIN SECTION: 324-U1349A-10R-4-W 44_45-TS223 Piece No: DESCRIPTION U1349A-10R-4, 44-45 cm, TS 223 cm, 44-45 U1349A-10R-4,

Proc. IODP | Volume 324 18 Site U1349 core descriptions Thin sections OBSERVER:THIN SECTION:TS225 OBSERVER:THIN rdehbus ot lardehue ot la rdehbus lacirehps ylhgih lacirehps esalcoigalp lardehbus30.0 lardehbus lardehna ralucica enivilo enivilo ssalg Unit:19 2.0 3.0 5.2 2.0 1.1 4.0 1.0 8.0 5.3 4.0 4.1 SIZE(mm) min. max. mode. REPLACING/FILLING COMMENTS 1 001 001 52 0 100 1 001 001 001 52 03 03 Crystallinity: 62%; Alteration Degree: 48%; Vein Filling: Calcite and orange clays; Vesicle Filling: None; Structure: Thick syntaxic Filling: None; Structure: Filling: Calcite and orange clays; Vesicle Alteration Degree: 48%; Vein Crystallinity: 62%; Thick syntaxic veins connecting amygdules. Subophitic structure in groundmass. 30%; Sparsely Olivine Phyric Intergranular Basalt; Microcrystalline; Middle part of highly vesicular inflation unit; Vesicularity veins connecting amygdules. Subophitic structure in groundmass. 1 39 1 1 1 sparsely phyric basalt very fine grained sparsely phyric,ophimottled PERCENTORIGINAL REL. VOL. REPLACED SIZE(mm) min. max. mode. MORPHOLOGY COMMENTS STRUCTURE COMMENTS SUMMARY brown clays iddingsite brown clays SECONDARY MINERALOGY iddingsite plagioclase DESCRIPTION glass opaque Minerals GROUNDMASSpyroxene 98 VESICLES MICROPHENOCRYST olivine THIN SECTION: 324-U1349A-10R-5-W 2_4-TS225 Piece No: WHERE SAMPLED:GRAINSIZE: TEXTURE: middle part of highly vesicular inflation unit PRIMARY MINERALOGY PHENOCRYSTSolivine 1 ROCK NAME: U1349A-10R-5, 2-4cm,TS 225

Proc. IODP | Volume 324 19 Site U1349 core descriptions Thin sections e. ty 30%; OBSERVER:THIN SECTION:TS226 OBSERVER:THIN as rim Unit:20 glass glass olivine plagioclase olivine vesicle 1.40.8 0.9 0.6 subhedral subhedral max. mode. MORPHOLOGY COMMENTS 0.250.30.3 0.15 0.08 0.2 acicular skeletal subhedral min. 0.5 7SIZE(mm) 1.2min. elongate max. mode. REPLACING/FILLING COMMENTS 90 95 sparsely phyric basalt highly visicular spongy inflation unit microcrystalline [324] sparsely phyric,intergranular PERCENTORIGINAL REL. VOL. REPLACED SIZE(mm) 1 30 40 1 55 Sparsely olivine phyric Intersertal Basalt; Microcrystalline; Middle part of highly vesicular spongy inflation unit; Vesiculari 10 100 80 100 No structure. 98 1 40 19 90 Crystallinity: 81%; Alteration Degree: 74%; Vein Filling: None; Vesicle Filling: Calcite and brown clay; Structure: No structur Filling: None; Vesicle Alteration Degree: 74%; Vein Crystallinity: 81%;

Y WHERE SAMPLED: GRAINSIZE: TEXTURE: PRIMARY MINERALOGY ROCK NAME: MICROPHENOCRYST olivine VESICLES THIN SECTION: 30_32-TS226 324-U1349A-11R-1-W Piece No: PHENOCRYSTSolivine 1 COMMENTS SUMMAR calcite iddingsite clays clays iddingsite brown clays calcite STRUCTURE GROUNDMASS MINERALOGY clays plagioclase SECONDARY opaque Minerals pyroxene glass DESCRIPTION U1349A-11R-1, 30-32 cm, TS 226 cm, 30-32 U1349A-11R-1,

Proc. IODP | Volume 324 20 Site U1349 core descriptions Thin sections edils eht ni elbisiv si enexoryp on enexoryp si elbisiv ni eht edils OBSERVER:THIN SECTION:TS227 OBSERVER:THIN rdehbus ot lardehue ot la rdehbus lacirehps ylhgih lacirehps esalcoigalp lardehbus30.080.0 lardehbus51.0 lardehbus ralucica51.052.0 elcisev enivilo ssalg Unit:20 2.1 6.0 1 5.0 8.0 2.1 6 THIN SECTION DESCRIPTIONS SIZE(mm) min. max. mode. REPLACING/FILLING COMMENTS 1 001 001 100 001 001 1.0 1.0 99 04 03 51 54 structure. Amygdaloidal structure. Vesicles filled with calcite. Aphyric Intersertal Basalt; Microcrystalline; Middle part of highly vesicular basalt; Vesicularity 45%; Crystallinity: 47%; Alteration 45%; Crystallinity: 47%; Aphyric Intersertal Basalt; Microcrystalline; Middle part of highly vesicular basalt; Vesicularity 2 Degree: 69%; Vein Filling: Calcite, Brown clay and Fe oxyhydroxide; Vesicle Filling: Calcite and Brown clay; Structure: Amygdaloidal Filling: Calcite and Brown clay; Structure: Amygdaloidal Filling: Calcite, Brown clay and Fe oxyhydroxide; Vesicle Degree: 69%; Vein 53 aphyric basalt microcrystalline [324] intersertal,aphyric PERCENTORIGINAL REL. VOL. REPLACED SIZE(mm) min. max. mode. MORPHOLOGY COMMENTS STRUCTURE COMMENTS SUMMARY calcite brown clay brown clay SECONDARY MINERALOGY iddingsite opaque Minerals DESCRIPTION plagioclase GROUNDMASSglass 100 pyroxene VESICLES MICROPHENOCRYST olivine WHERE SAMPLED:GRAINSIZE: TEXTURE: middle part of highly vesicular basalt PRIMARY MINERALOGY PHENOCRYSTSolivine 0 THIN SECTION:ROCK NAME: 124_128-TS227 324-U1349A-11R-1-W Piece No: U1349A-11R-1, 124-128 cm, TS 227

Proc. IODP | Volume 324 21 Site U1349 core descriptions Thin sections OBSERVER:THIN SECTION:TS228 OBSERVER:THIN (100%) compared to the other adjacent part (90%) One part of the TS is more altered One part of the etagnole ylhgih etagnole lardehbus20.050.0 lardehbus la rdehbus la rdehna51.0 enivilo enivilo glass plagioclase Unit 22 6.0 1.1 2 2.0 8.0 0.25 0.2 acicular 4 2 SIZE(mm) min. max. mode. REPLACING/FILLING COMMENTS 1 001 001 1.0 02 06 100 Massive structure and amygdaloidal structure. Vesicles filled with calcite. Alteration 60%; Crystallinity: 65%; Aphyric Intersertal Basalt; Microcrystalline; Middle part of highly vesicular basalt; Vesicularity 5 35 40 clay; Structure: Massive structure and amygdaloidal structure. Yellow Filling: Calcite and Filling: None; Vesicle Degree: 55%; Vein 1 aphyric basalt microcrystalline [324] intersertal,aphyric PERCENTORIGINAL REL. VOL. REPLACED SIZE(mm) min. max. mode. MORPHOLOGY COMMENTS COMMENTS SUMMARY yellow clay STRUCTURE iddingsite SECONDARY MINERALOGY light brown clays 100 light brown clays iddingsite pyroxene GROUNDMASSplagioclase 99 glass opaque Minerals VESICLES DESCRIPTION MICROPHENOCRYST olivine THIN SECTION: 3_6-TS228 324-U1349A-11R-4-W Piece No: WHERE SAMPLED:GRAINSIZE: TEXTURE: middle part of highly vesicular basalt PRIMARY MINERALOGY PHENOCRYSTSolivine 1 ROCK NAME: U1349A-11R-4, 3-6cm,TS 228

Proc. IODP | Volume 324 22 Site U1349 core descriptions Thin sections cluding OBSERVER:THIN SECTION:TS229 OBSERVER:THIN few spinel inclusions coalesced vesicles Unit:22 olivine plagioclase glass vesicle REPLACING/FILLING COMMENTS mode. 1.20.5 0.60.2 0.4 euhedral 0.30.1 0.15 subhedral 0.15 anhedral 0.05 acicular subhedral max. mode. MORPHOLOGY COMMENTS SIZE(mm) min. max. min. 0.5 8 5 elongate g host-basaltic clasts. 100 100 90 Alteration Degree: 68%; Vein Filling: Calcite and Orange clay; Vesicle Filling: Calcite and Fe oxide; Structure: Thick veins in Filling: Calcite and Fe oxide; Structure: Filling: Calcite and Orange clay; Vesicle Alteration Degree: 68%; Vein host-basaltic clasts. sparsely phyric basalt middle part of highly vesicular basalt microcrystalline [324] intersertal,sparsely phyric PERCENTORIGINAL REL. VOL. REPLACED SIZE(mm) Sparsely olivine phyric Intersertal Basalt; Microcrystalline; Middle part of highly vesicular basalt; Vesicularity 70%; Crystallinity: 66%; 70%; Crystallinity: Sparsely olivine phyric Intersertal Basalt; Microcrystalline; Middle part of highly vesicular basalt; Vesicularity 80 100 Thick veins includin 1 70 98 20 35 40 5 100 1

Y WHERE SAMPLED: GRAINSIZE: TEXTURE: PRIMARY MINERALOGY ROCK NAME: brown clays brown clays calcite Fe-oxides STRUCTURE pyroxene MICROPHENOCRYST olivine VESICLES GROUNDMASS glass plagioclase Opaque Minerals SECONDARY iddingsite MINERALOGY THIN SECTION: 88_93-TS229 324-U1349A-11R-4-W Piece No: PHENOCRYSTSolivine 1 COMMENTS SUMMAR DESCRIPTION U1349A-11R-4, 88-93 cm, TS 229 cm, 88-93 U1349A-11R-4,

Proc. IODP | Volume 324 23 Site U1349 core descriptions Thin sections t; OBSERVER:THIN SECTION:TS230 OBSERVER:THIN Unit:22 olivine plagioclase olivine plagioclase vesicle REPLACING/FILLING COMMENTS mode. 20.6 1.2 0.4 euhedral subhedral 0.350.15 0.150.05 0.1 anhedral 0.02 acicular subhedral Alteration Degree: 79%; Vein Filling: Calcite; Vesicle Filling: Calcite; Structure: One calcite vein Filling: Calcite; Structure: One calcite Filling: Calcite; Vesicle Alteration Degree: 79%; Vein 0.5 4 3 highly elongate coalesced vesicles SIZE(mm) min. max. 100 100 100 esicularity 75%; Crystallinity: 36%; V sparsely phyric basalt middle part of high vesicular basalt; mixing with massive basalt microcrystalline [324] intersertal,sparsely phyric PERCENTORIGINAL REL. VOL. REPLACED1 SIZE(mm) min.1 75 max. mode. MORPHOLOGY COMMENTS 30 85 60 100 One calcite vein connectin g am yg dules. Sparsely olivine phyric Intersertal Basalt; Microcrystalline; Middle part of highly vesicular basalt, mixing with massive basal 98 15 65 15 5 15 connecting amygdules.

Y WHERE SAMPLED: GRAINSIZE: TEXTURE: PRIMARY MINERALOGY PHENOCRYSTSolivine 1 ROCK NAME: MICROPHENOCRYST olivine VESICLES THIN SECTION: 11_14-TS230 324-U1349A-11R-5-W Piece No: white clays iddingsite brown clays gray clays calcite STRUCTURE COMMENTS SUMMAR GROUNDMASS pyroxene glass plagioclase Opaque Minerals SECONDARY calcite MINERALOGY DESCRIPTION U1349A-11R-5, 11-14 cm, TS 230 cm, 11-14 U1349A-11R-5,

Proc. IODP | Volume 324 24 Site U1349 core descriptions Thin sections saponite, rim around the vesicles 100% altered mesostasis, probably contained pyroxene, which is not identified now OBSERVER:THIN SECTION:TS231 OBSERVER:THIN rdehbus ot lardehue ot la rdehbus esalcoigalp lardehbus lardehna80.0 et agnole ralucica enivilo ssalg vesicle Unit:22 1.051.0 4.0 4 1 1.0 7.0 8 2 SIZE(mm) min. max. mode. REPLACING/FILLING COMMENTS 2 001 100 001 001 1.0 08 52 52 structure with vein. Alteration Degree: 92%; Vein Filling: Calcite, Brown clay and Fe-oxide; Vesicle Filling: Calcite, Yellow clay; Structure: amygdaloidal Yellow Filling: Calcite, Filling: Calcite, Brown clay and Fe-oxide; Vesicle Alteration Degree: 92%; Vein Amygdaloidal structure with vein. 25%; Crystallinity: 29%; Aphyric Intersertal Basalt; Microcrystalline; Middle part of highly vesicular spongy lava flow; Vesicularity 3 72 1 aphyric basalt microcrystalline [324] intersertal,aphyric PERCENTORIGINAL REL. VOL. REPLACED SIZE(mm) min. max. mode. MORPHOLOGY COMMENTS yellow clay COMMENTS SUMMARY STRUCTURE light brown clays light brown clays SECONDARY MINERALOGY iddingsite plagioclase glass GROUNDMASSOpaque Minerals 100 DESCRIPTION VESICLES MICROPHENOCRYST olivine THIN SECTION: 75_77-TS231 324-U1349A-11R-5-W Piece No: WHERE SAMPLED:GRAINSIZE: TEXTURE: middle part of highly vesicular spongy lava flow PRIMARY MINERALOGY PHENOCRYSTSolivine 0 ROCK NAME: U1349A-11R-5, 75-77 cm, TS 231

Proc. IODP | Volume 324 25 Site U1349 core descriptions Thin sections ty: 35%; OBSERVER:THIN SECTION:TS232 OBSERVER:THIN spinel inclusions esicularity 40%; Crystallini Unit:22 plagioclase olivine pyroxene olivine glass vesicle 40.8 1.3 0.6 euhedral subhedral max. mode. MORPHOLOGY COMMENTS 0.10.3 0.05 0.2 anhedral acicular min. 0.5 6 3 elongate SIZE(mm) min. max. mode. REPLACING/FILLING COMMENTS ein Filling: None; Vesicle Filling: Calcite and Light brown clay; Structure: Sheared bubbles (amygdule s). ein Filling: None; Vesicle 100 90 sparsely phyric basalt Middle part of inflation flow unit microcrystalline [324] sparsely phyric,intersertal PERCENTORIGINAL REL. VOL. REPLACED SIZE(mm) 2 40 1 95 Sheared bubbles ( am yg dules ) are obli q ue to the core. Sparsely olivine phyric Intersertal Basalt; Microcrystalline; Middle part of inflation flow unit; V 97 3 67 30 95 95 50 5 100 5 Alteration Degree: 96%; V

Y WHERE SAMPLED: GRAINSIZE: TEXTURE: PRIMARY MINERALOGY ROCK NAME: MICROPHENOCRYST olivine VESICLES THIN SECTION: 17_23-TS232 324-U1349A-11R-6-W Piece No: PHENOCRYSTSolivine 1 GROUNDMASS opaque Minerals glass plagioclase SECONDARY MINERALOGY light brown clays iddingsite brown clays calcite brown clays calcite light brown clays STRUCTURE COMMENTS SUMMAR DESCRIPTION U1349A-11R-6, 17-23 cm, TS 232 cm, 17-23 U1349A-11R-6,

Proc. IODP | Volume 324 26 Site U1349 core descriptions Thin sections elpmas eht ni tneserp si etitameH si tneserp ni eht elpmas isgniddi yb decalper yb et isgniddi OBSERVER:THIN SECTION:TS233 OBSERVER:THIN esalcoigalp la rdehbus la rdehna la rdehue et agnole la teleks30.060.0 ra lucica21.051.0 enivilo ssalg vesicle Unit:22 1.0 4.0 6.0 4 2.0 5.0 2.1 01 5.0 SIZE(mm) min. max. mode. REPLACING/FILLING COMMENTS 001 09 100 001 001 1. 0 08 04 02 07 Spongy amygdaloidal structure. Alteration 70%; Crystallinity: 63%; Aphyric Intersertal Basalt; Microcrystalline; Middle part of highly vesicular basalt; Vesicularity Degree: 79%; Vein Filling: None; Vesicle Filling: Calcite; Structure: Spongy amygdaloidal structure. Filling: None; Vesicle Degree: 79%; Vein 3 37 1 aphyric basalt microcrystalline [324] aphyric,intersertal PERCENTORIGINAL REL. VOL. REPLACED SIZE(mm) min. max. mode. MORPHOLOGY COMMENTS COMMENTS SUMMARY STRUCTURE calcite brown clays iddingsite SECONDARY MINERALOGY brown clays plagioclase DESCRIPTION Opaque Minerals GROUNDMASSglass pyroxene 99 VESICLES MICROPHENOCRYST olivine THIN SECTION: 64_66-TS233 324-U1349A-11R-6-W Piece No: WHERE SAMPLED:GRAINSIZE: TEXTURE: middle part of highly vesicular basalt PRIMARY MINERALOGY PHENOCRYSTSolivine 0 ROCK NAME: U1349A-11R-6, 64-66 cm, TS 233

Proc. IODP | Volume 324 27 Site U1349 core descriptions Thin sections OBSERVER:THIN SECTION:TS234 OBSERVER:THIN rdehbus ot lardehue ot la rdehbus esalcoigalp lardehbus lardehna lateleks60.0 ra lucica enivilo enivilo enivilo ssalg Unit:24 8.0 1.0 4.0 2.1 1.0 2.1 2.0 6.0 2 SIZE(mm) min. max. mode. REPLACING/FILLING COMMENTS yntaxial calcite vein filled with zeolite at the side and in middle. 06 05 001 001 08 04 02 04 52 Massive structure with one s Alteration degree: 30-40% 1 34 2 0 1 sparsely phyric basalt microcrystalline [324] sparsely phyric,intersertal PERCENTORIGINAL REL. VOL. REPLACED SIZE(mm) min. max. mode. MORPHOLOGY COMMENTS 10 STRUCTURE COMMENTS SUMMARY light brown clays light brown clays iddingsite iddingsite SECONDARY light brown clays opaque Minerals glass MINERALOGY calcite pyroxene DESCRIPTION VESICLES GROUNDMASSplagioclase 97 MICROPHENOCRYST olivine WHERE SAMPLED:GRAINSIZE: TEXTURE: middle part of highly vesicular ibasalt PRIMARY MINERALOGY PHENOCRYSTSolivine 1 ROCK NAME: THIN SECTION: 324-U1349A-12R-2-W 111_113-TS234 Piece No: U1349A-12R-2, 111-113 cm, TS 234

Proc. IODP | Volume 324 28 Site U1349 core descriptions Thin sections esicularity 1%; Crystallinity: 82%; V groundmass (glassm, plagio) altered to altered to iddingsite and spinel inclusions clay, and olivine iddingsite replaced by clay, patchy alteration of the groundmass to OBSERVER:THIN SECTION:TS235 OBSERVER:THIN green mineral iddingsite and then later to chlorite lardehbus la rdehbus ra nmuloc lardehna51.0 lateleks50.090.0 enivilo enivilo ssalg hgih glass olivine Unit:24 1.052.0 5. 2 6.0 2 ynaxial zeolite? or cholorite?, and calcite. 4.0 7.0 3 4 SIZE(mm) min. max. mode. REPLACING/FILLING COMMENTS 2 05 04 001 001 001 04 04 1 Alteration Degree: 60%; Vein Filling: Calcite and Chlorite; Vesicle Filling: None; Structure: Massive structure with several veins. Filling: Calcite and Chlorite; Vesicle Alteration Degree: 60%; Vein 1 97 19 2 Massive structure with several veins filled s 1 sparsely phyric basalt middle part of highly vesicular basalt 0.2 sparsely phyric,intergranular PERCENTORIGINAL REL. VOL.3 REPLACED SIZE(mm) min. max. mode. MORPHOLOGY COMMENTS Sparsely olivine phyric Intergranular Basalt; Microcrystalline; Middle part of highly vesicular basalt; 324-U1349A-12R-3-W 32_34-TS235 Piece No: ri-Dioctahedral) T MINERALOGY Chlorite group (Tri-Dioctahedral) SECONDARY opaque Minerals pyroxene GROUNDMASS glass plagioclase VESICLES STRUCTURE COMMENTS DESCRIPTION SUMMARY olivine MICROPHENOCRYST chlorite group (Tri-Dioctahedral) iddingsite PHENOCRYSTS THIN SECTION: ROCK NAME: WHERE SAMPLED: GRAINSIZE: TEXTURE: PRIMARY MINERALOGY olivine iddingsite light brown clays chlorite group ( U1349A-12R-3, 32-34 cm, TS 235

Proc. IODP | Volume 324 29 Site U1349 core descriptions Thin sections selcisev decselaocetagnole hgih ot wol5.2 ot hgih decselaocetagnole selcisev OBSERVER:THIN SECTION:TS237 OBSERVER:THIN rdehbus ot lardehue ot la rdehbus la rdehbus ranmuloc51.052.0 la rdehna enexoryp lateleks70.080.0 enivilo enivilo enivilo ssalg olivine Unit:24 2.0 5.0 9.0 3.0 6.0 2.1 51 SIZE(mm) min. max. mode. REPLACING/FILLING COMMENTS 001 001 07 03 03 04 Alteration Degree: 45%; Vein Filling: Calcite; Vesicle Filling: Saponite; Structure: Massive structure with several syntaxial veins. Filling: Calcite; Vesicle Alteration Degree: 45%; Vein 40 Massive structure with several syntaxial calcite and zeolite veins. 7%; Crystallinity: 72%; Sparsely olivine phyric Intergranular Basalt; Microcrystalline; Middle part of highly vesicular basalt; Vesicularity 8 1 29 7 1 1 sparsely phyric basalt microcrystalline [324] phyric intergranular,sparsely PERCENTORIGINAL REL. VOL. REPLACED SIZE(mm) min. max. mode. MORPHOLOGY COMMENTS saponite STRUCTURE COMMENTS SUMMARY saponite brown clays iddingsite saponite brown clays brown clays glass SECONDARY MINERALOGY calcite Opaque Minerals DESCRIPTION plagioclase GROUNDMASSpyroxene 98 VESICLES MICROPHENOCRYST olivine WHERE SAMPLED:GRAINSIZE: TEXTURE: middle part of highly vesicular basalt ROCK NAME: PRIMARY MINERALOGY PHENOCRYSTSolivine 1 THIN SECTION: 324-U1349A-12R-4-W 112_116-TS237 Piece No: U1349A-12R-4, 112-116 cm, TS 237

Proc. IODP | Volume 324 30 Site U1349 core descriptions Thin sections likely stilbite secondary OBSERVER:THIN SECTION:TS238 OBSERVER:THIN cirehps yletaredom la cirehps esalcoigalp la rdehbus la rdehna la rdehue enexoryp enivilo ssalg vesicle olivine Unit:27 70.0 1.0 2.0 5.0 4.0 3 1 1.0 2.0 3.0 6.0 8.0 2.1 8 5.0 SIZE(mm) min. max. mode. REPLACING/FILLING COMMENTS 001 001 1. 0 53 06 02 04 01 60 40 Massive structure with deformed phenocrysts and veins cut the phenocryts. Alteration 10%; Crystallinity: 62%; Aphyric Intersertal Basalt; Microcrystalline; Middle part of highly vesicular basalt; Vesicularity 1 Degree: 65%; Vein Filling: Calcite, hematite and zeolite; Vesicle Filling: Zeolite; Structure: Massive structure with deformed Filling: Calcite, hematite and zeolite; Vesicle Degree: 65%; Vein 39 1 phenocrysts. Veins cutting the phenocryts. phenocrysts. Veins 1 aphyric basalt microcrystalline [324] aphyric,intersertal PERCENT REL. VOL. SIZE(mm) ORIGINAL REPLACED min. max. mode. MORPHOLOGY COMMENTS calcite zeolite COMMENTS SUMMARY STRUCTURE brown clays saponite brown clays iddingsite SECONDARY opaque Minerals brown clays MINERALOGY saponite plagioclase glass GROUNDMASSpyroxene 98 DESCRIPTION VESICLES olivine WHERE SAMPLED:GRAINSIZE: TEXTURE: middle part of highly vesicular basalt PRIMARY MICROPHENOCRYST pyroxene ROCK NAME: THIN SECTION: 324-U1349A-13R-1-W 29_32-TS238 Piece No: MINERALOGY PHENOCRYSTSolivine 0 U1349A-13R-1, 29-32 cm, TS 238

Proc. IODP | Volume 324 31 Site U1349 core descriptions Thin sections snoisulcni lenipslardehbus ot lardehue ot lenipslardehbus snoisulcni OBSERVER:THIN SECTION:TS239 OBSERVER:THIN lateleks ,lardehbus80.051.0 lateleks esalcoigalp la rdehbus la rdehna enexoryp etagnole ra lucica elcisev elcisev elcisev enivilo enivilo vesicle Unit:27 1.0 2.0 5.2 5.0 1. 1 2.0 3.0 6.0 3 2 5.0 SIZE(mm) min. max. mode. REPLACING/FILLING COMMENTS 03 06 100 001 06 04 06 03 04 03 Alteration Degree: 70%; Vein Filling: Calcite; Vesicle Filling: Calcite, Saponite, Chlorite and Fe-oxides; Structure: amygdaloidal Filling: Calcite; Vesicle Alteration Degree: 70%; Vein structure with syntaxial growth of veins Amygdaloidal structure with syntaxial growth of calcite veins 100 85 10%; Crystallinity: 62%; Sparsely olivine phyric Intersertal Basalt; Microcrystalline; Middle part of highly vesicular basalt; Vesicularity 5 5 5 1 7 98 39 1 1 sparsely phyric basalt middle part of highly vesicular basalt microcrystalline [324] intersertal,sparsely phyric PERCENT REL. VOL. SIZE(mm) ORIGINAL1 REPLACED min. max. mode. MORPHOLOGY COMMENTS 324-U1349A-13R-2-W 9_12-TS239 Piece No: STRUCTURE COMMENTS DESCRIPTION SUMMARY saponite calcite Fe-oxides brown clays chlorite group (Tri-Dioctahedral) saponite saponite SECONDARY calcite MINERALOGY brown clays brown clays plagioclase opaque Minerals GROUNDMASS glass pyroxene VESICLES MICROPHENOCRYST olivine THIN SECTION: WHERE SAMPLED: GRAINSIZE: TEXTURE: PRIMARY ROCK NAME: MINERALOGY PHENOCRYSTS olivine U1349A-13R-2, 9-12 cm, TS 239

Proc. IODP | Volume 324 32 Site U1349 core descriptions Thin sections snoisulcni lenipslardehbus ot lardehue ot lenipslardehbus snoisulcni OBSERVER:THIN SECTION:TS240 OBSERVER:THIN teleks ,lardehbus30.080.0 la teleks esalcoigalp la rdehbus la rdehna et agnole ralucica enivilo enivilo ssalg ssalg vesicle vesicle Unit:28 1.052.0 1.0 6.0 2 1 2.0 7.0 4 2 5.0 SIZE(mm) min. max. mode. REPLACING/FILLING COMMENTS 09 09 100 59 08 01 09 03 05 02 Alteration Degree: 84%; Vein Filling: None; Vesicle Filling: Calcite, Saponite and Green clay; Structure: massive structure in the Filling: None; Vesicle Alteration Degree: 84%; Vein groundmass and amygdaloidal structure. 80 Massive structure in the groundmass and amygdaloidal structure. 20%; Crystallinity: 82%; Sparsely olivine phyric Intersertal Basalt; Microcrystalline; Middle part of highly vesicular basalt; Vesicularity 5 1 19 2 1 sparsely phyric basalt microcrystalline [324] intersertal,sparsely phyric PERCENTORIGINAL REL. VOL. REPLACED SIZE(mm) min. max. mode. MORPHOLOGY COMMENTS COMMENTS SUMMARY calcite green clay STRUCTURE saponite brown clays iddingsite brown clays green clays SECONDARY calcite MINERALOGY brown clays opaque Minerals glass pyroxene DESCRIPTION GROUNDMASSplagioclase 97 VESICLES MICROPHENOCRYST olivine THIN SECTION: 324-U1349A-13R-2-W 107_110-TS240 Piece No: WHERE SAMPLED:GRAINSIZE: TEXTURE: middle part of vesicular inflation unit PRIMARY MINERALOGY PHENOCRYSTSolivine 1 ROCK NAME: U1349A-13R-2, 107-110 cm, TS 240

Proc. IODP | Volume 324 33 Site U1349 core descriptions Thin sections snoisulcni lenipslardehbus ot lardehue ot lenipslardehbus snoisulcni ssamdnuorg tsyrconehp OBSERVER:THIN SECTION:TS241 OBSERVER:THIN lateleks ,lardehbus30.080.0 lateleks agnole ylhgih et agnole esalcoigalp lardehbus lardehna80.051.0 ralucica80.0 enivilo enivilo enivilo ssalg vesicle Unit:29 4.0 1.1 2 1.0 6.0 5.1 7 5.0 SIZE(mm) min. max. mode. REPLACING/FILLING COMMENTS 001 001 100 001 09 02 09 08 53 04 01 Alteration Degree: 95%; Vein Filling: None; Vesicle Filling: Calcite; Structure: Massive structure in the groundmass and amygdaloidal Filling: None; Vesicle Alteration Degree: 95%; Vein structure. 10 10%; Crystallinity: 77%; Sparsely olivine phyric Intersertal Basalt; Microcrystalline; Middle part of highly vesicular basalt; Vesicularity Massive structure in the groundmass and amygdaloidal structure. 1 24 2 1 sparsely phyric basalt microcrystalline [324] sparsely phyric,intersertal PERCENTORIGINAL REL. VOL. REPLACED SIZE(mm) min. max. mode. MORPHOLOGY COMMENTS COMMENTS SUMMARY calcite STRUCTURE calcite brown clays calcite iddingsite brown clays SECONDARY MINERALOGY iddingsite DESCRIPTION pyroxene opaque Minerals GROUNDMASSglass 97 plagioclase VESICLES MICROPHENOCRYST olivine THIN SECTION: 324-U1349A-13R-3-W 69_72-TS241 Piece No: WHERE SAMPLED:GRAINSIZE: TEXTURE: middle part of highly vesicular basalt PRIMARY MINERALOGY PHENOCRYSTSolivine 1 ROCK NAME: U1349A-13R-3, 69-72 cm, TS 241

Proc. IODP | Volume 324 34 Site U1349 core descriptions Thin sections snoisulcni lenips snoisulcni tsyrconehp esicularity 10%; Crystallinity: 53%; V Hematite is present in the groundmass OBSERVER:THIN SECTION:TS243 OBSERVER:THIN lateleks ,lardehbus50.080.0 lateleks agnole ylhgih et agnole esalcoigalp lardehbus lardehbus lardehna enexoryp ralucica80.021.0 enivilo ssalg vesicle Unit:31 1.0 3.0 2.1 3 2.0 4.0 7 2 5.0 SIZE(mm) min. max. mode. REPLACING/FILLING COMMENTS 07 06 100 ygdaloidal structure 001 001 05 04 52 52 01 Am 1 49 Alteration Degree: 73%; Vein Filling: None; Vesicle Filling: Saponite; Structure: Amygdaloidal structure. Filling: Saponite; Structure: Filling: None; Vesicle Alteration Degree: 73%; Vein 2 2 sparsely phyric basalt microcrystalline [324] intersertal,sparsely phyric PERCENTORIGINAL REL. VOL. REPLACED SIZE(mm) min. max. mode. MORPHOLOGY COMMENTS 100 Sparsely olivine phyric Intersertal Basalt; Microcrystalline; Middle part of highly vesicular basalt; STRUCTURE COMMENTS SUMMARY iddingsite saponite brown clays iddingsite SECONDARY brown clays MINERALOGY brown clays opaque Minerals glass pyroxene DESCRIPTION GROUNDMASSplagioclase 96 VESICLES MICROPHENOCRYST olivine THIN SECTION:WHERE SAMPLED:GRAINSIZE: 324-U1349A-13R-4-W 123_126-TS243TEXTURE: middle part of highly vesicular basalt PRIMARY Piece No: MINERALOGY PHENOCRYSTSolivine 2 ROCK NAME: U1349A-13R-4, 123-126 cm, TS 243

Proc. IODP | Volume 324 35 Site U1349 core descriptions Thin sections snoisulcni lenips snoisulcni OBSERVER:THIN SECTION:TS244 OBSERVER:THIN teleks ,lardehbus20.080.0 la teleks esalcoigalp lardehbus lardehbus la rdehna51.0 et agnole ra lucica80.0 enivilo ssalg vesicle vesicle Unit:31 2.0 2 1 4.0 1.0 5.0 1.1 31 5.0 SIZE(mm) min. max. mode. REPLACING/FILLING COMMENTS 09 09 100 001 59 05 03 54 04 Alteration Degree: 88%; Vein Filling: Calcite; Vesicle Filling: Calcite and Green clays; Structure: Amygdaloidal structure. Filling: Calcite and Green clays; Structure: Filling: Calcite; Vesicle Alteration Degree: 88%; Vein 70 Amygdaloidal structure 40%; Crystallinity: 77%; Sparsely olivine phyric Intersertal Basalt; Microcrystalline; Middle part of highly vesicular basalt; Vesicularity 24 1 96 2 2 324-U1349A-13R-6-W 9_12-TS244 Piece No: sparsely phyric basalt microcrystalline [324] intersertal,sparsely phyric PERCENT REL. VOL. SIZE(mm) ORIGINAL2 REPLACED min. max. mode. MORPHOLOGY COMMENTS calcite STRUCTURE COMMENTS DESCRIPTION SUMMARY brown clays green clays calcite brown clays brown clays SECONDARY MINERALOGY iddingsite glass pyroxene plagioclase GROUNDMASS opaque Minerals VESICLES MICROPHENOCRYST olivine THIN SECTION: ROCK NAME: WHERE SAMPLED:GRAINSIZE: TEXTURE: middle part of highly vesicular basalt PRIMARY MINERALOGY PHENOCRYSTS olivine U1349A-13R-6, 9-12 cm, TS 244

Proc. IODP | Volume 324 36 Site U1349 core descriptions Thin sections Thick nity: 58%; OBSERVER:THIN SECTION:TS245 OBSERVER:THIN secondary secondary Unit:32 olivine glass titano-magnetite olivine pyroxene plagioclase vesicle 30.4 1.4 0.2 euhedral to subhedral subhedral spinel inclusions 0.10.20.3 0.04 0.15 subhedral 0.1 acicular anhedral 0.5 8 3 highly elongate SIZE(mm) min. max. mode. REPLACING/FILLING COMMENTS 90 100 100 composite vein is polycrystaline. Thin veins are connecting amygdules. composite vein is polycrystaline. Alteration Degree: 98%; Vein Filling: Calcite, Brown clays and Fe-oxides; Vesicle Filling: Calcite and Orange clays; Structure: Filling: Calcite, Brown clays and Fe-oxides; Vesicle Alteration Degree: 98%; Vein sparsely phyric basalt middle part of volcanic flow breccia microcrystalline [324] sparsely phyric,intersertal PERCENTORIGINAL REL. VOL. REPLACED2 SIZE(mm) min.2 15 max. mode. MORPHOLOGY COMMENTS 100 15%; Crystalli Sparsely olivine phyric Intersertal Basalt; Microcrystalline; Middle part of volcanic flow breccia; Vesicularity 96 1 30 44 25 40 100 80 60 98 95 Thin calcite veins are connecting amygdules. Thick composite vein is polycrystaline.

Y WHERE SAMPLED: GRAINSIZE: TEXTURE: PRIMARY MINERALOGY PHENOCRYSTSolivine 2 ROCK NAME: MICROPHENOCRYST olivine VESICLES THIN SECTION: 324-U1349A-14R-1-W 38_42-TS245 Piece No: GROUNDMASS Opaque Minerals plagioclase glass pyroxene SECONDARY MINERALOGY calcite COMMENTS SUMMAR brown clays brown clays iddingsite iddingsite brown clays brown clays orange clays calcite STRUCTURE DESCRIPTION U1349A-14R-1, 38-42 cm, TS 245 cm, 38-42 U1349A-14R-1,

Proc. IODP | Volume 324 37 Site U1349 core descriptions Thin sections OBSERVER:THIN SECTION:TS251 OBSERVER:THIN olivine olivine olivine glass vesicle vesicle vesicle vesicle Unit:32 0.02x0.02 0.02x0.020.2x0.02 subhedral 0.1x0.02 acicular 40.1x0.1 0.1x0.05 1.8 subhedral low sphericity 1.6x0.8 1.0x0.60.5x0.3 subhedral 0.4x0.3 subhedral SIZE(mm) min. max. mode. REPLACING/FILLING COMMENTS 95 100 100 0 100 100 30 48 95 2 3 100 Polycrystaline calcite veins are heterogeneously distributed with thick alteration halo. None; Structure: Polycrystaline calcite veins are heterogeneously distributed with thick alteration halo. 20 2 sparsely phyric basalt middle part of volcaniclastic breccia microcrystalline [324] sparsely phyric,intersertal PERCENTORIGINAL REL. VOL. REPLACED1 SIZE(mm) min.1 7 max. mode. MORPHOLOGY COMMENTS 95 Degree: Alteration 7%; Crystallinity: 53%; flow breccia; Vesicularity Sparsely Olivine Phyric Intersertal Basalt; Microcrystalline; Volcanic 97%; Vein Filling: Saponite and calcite; Vesicle Filling: Calcite, brown clays and Fe-oxides (A) saponite calcite (B); Cement: Filling: Saponite and calcite; Vesicle 97%; Vein

Y MINERALOGY iddingsite COMMENTS SUMMAR plagioclase glass SECONDARY calcite green clays brown clays brown clays Fe-oxides saponite calcite brown clays calcite STRUCTURE GROUNDMASSpyroxene opaque Minerals 98 WHERE SAMPLED: GRAINSIZE: TEXTURE: PRIMARY MINERALOGY PHENOCRYSTSolivine 1 ROCK NAME: MICROPHENOCRYST olivine VESICLES THIN SECTION: 324-U1349A-14R-1-W 124_127-TS251 Piece No: DESCRIPTION U1349A-14R-1, 124-127 cm, TS 251 TS cm, 124-127 U1349A-14R-1,

Proc. IODP | Volume 324 38 Site U1349 core descriptions Thin sections illed with OBSERVER:THIN SECTION:TS246 OBSERVER:THIN celadonite? as rim as rim Unit:32 olivine olivine glass plagioclase vesicle vesicle vesicle vesicle 20.3 1.2 0.2 euhedral to subhedral subhedral spinel inclusions 0.20.10.25 0.1 0.06 0.18 acicular subhedral subhedral 0.5 10 3 highly elongate SIZE(mm) min. max. mode. REPLACING/FILLING COMMENTS 80 100 100 2 15 sparsely phyric basalt middle part of volcanic flow breccia microcrystalline [324] sparsely phyric,intersertal PERCENTORIGINAL REL. VOL. REPLACED1 SIZE(mm) min. max. mode. MORPHOLOGY COMMENTS 97 7 0.5 87 5 10 Alteration 15%; 15%; Crystallinity: Sparsely olivine phyric Intersertal Basalt; Microcrystalline; Middle part of volcanic flow breccia; Vesicularity 80 10 100 95 Matrix filled with polycrystalline calcite. Some thin calcite veins show cross-fiber. polycrystalline calcite. Some thin calcite veins show cross-fiber. Degree: 94%; Vein Filling: None; Vesicle Filling: Calcite, Green clays, Brown Fe-oxides and Zeolite; Structure: Matrix f Filling: None; Vesicle Degree: 94%; Vein

Y MICROPHENOCRYST olivine VESICLES WHERE SAMPLED: GRAINSIZE: TEXTURE: PRIMARY MINERALOGY PHENOCRYSTSolivine 1 ROCK NAME: THIN SECTION: 324-U1349A-14R-4-W 50_56-TS246 Piece No: GROUNDMASS plagioclase Opaque Minerals glass pyroxene SECONDARY MINERALOGY saponite COMMENTS SUMMAR green clay green-brown clays green-brown clays iddingsite zeolite green clay Fe-oxides calcite brown clay STRUCTURE DESCRIPTION U1349A-14R-4, 50-56 cm, TS 246 cm, 50-56 U1349A-14R-4,

Proc. IODP | Volume 324 39 Site U1349 core descriptions Thin sections snoisulcni lenips tnadnabalardehbus ot lardehue ot tnadnabalardehbus lenips snoisulcni (minor) minor OBSERVER:THIN SECTION:TS247 OBSERVER:THIN et itengam-onatit esalcoigalp lardehbus50.0 lardehbus lardehna51.053.0 ralucica51.0 enivilo enivilo vesicle olivine highly elongate Unit:32 9.0 2.0 4. 1 5.0 1.0 3.0 4 2 5.0 SIZE(mm) min. max. mode. REPLACING/FILLING COMMENTS 001 001 001 001 55 001 55 02 03 08 53 53 52 100 Amygdaloidal structure filled with saponites. 25%; Crystallinity: 66%; Sparsely phyric Intersertal Basalt; Microcrystalline; middle part of volcanic flow breccia; Vesicularity Alteration Degree: 83%; Vein Filling: N/A; Vesicle Filling: Calcite and saponite; Structure: Amygdaloidal structure filled with saponites. Filling: Calcite and saponite; Structure: Filling: N/A; Vesicle Alteration Degree: 83%; Vein 2 2 sparsely phyric basalt microcrystalline [324] sparsely phyric,ophimottled PERCENTORIGINAL REL. VOL. REPLACED SIZE(mm) min. max. mode. MORPHOLOGY COMMENTS saponite COMMENTS SUMMARY calcite STRUCTURE brown clays brown clays serpentine brown clays SECONDARY calcite MINERALOGY saponite pyroxene Opaque Mineralsplagioclase 1 DESCRIPTION GROUNDMASSglass 96 VESICLES MICROPHENOCRYST olivine WHERE SAMPLED:GRAINSIZE: TEXTURE: middle part of volcanic flow breccia PRIMARY MINERALOGY PHENOCRYSTSolivine 2 ROCK NAME: THIN SECTION: 324-U1349A-14R-4-W 97_98-TS247 Piece No: U1349A-14R-4, 97-98 cm, TS 247

Proc. IODP | Volume 324 40 Site U1349 core descriptions Thin sections tly %; OBSERVER:THIN SECTION:TS248 OBSERVER:THIN spinel inclusions basalt clasts in glass Unit:32 olivine olivine plagioclase olivine olivine vesicle 30.5 1.4 0.2 anhedral anhedral 0.50.30.1 0.2 0.15 0.05 subhedral acicular subhedral 0.5 9SIZE(mm) 0.5min. highly elongate max. mode. REPLACING/FILLING COMMENTS 100 100 90 90 50 composite or cross-fiber. sparsely phyric basalt middle part of volcanic flow breccia microcrystalline [324] sparsely phyric,intersertal PERCENTORIGINAL REL. VOL. REPLACED1 SIZE(mm) min.1 20 max. mode. MORPHOLOGY COMMENTS 5 90 5 100 80 Thin calcite veins of network, partly composite or cross-fiber. 20%; Crystallinity: 23 Sparsely phyric Intersertal Basalt; Microcrystalline; middle part of volcanic flow breccia; Vesicularity 98 10 10 1 79 10 Alteration Degree: 98%; Vein Filling: N/A; Vesicle Filling: Calcite and saponite; Structure: Thin calcite veins of network, par Filling: Calcite and saponite; Structure: Filling: N/A; Vesicle Alteration Degree: 98%; Vein

Y WHERE SAMPLED: GRAINSIZE: TEXTURE: PRIMARY MINERALOGY PHENOCRYSTSolivine 1 ROCK NAME: MICROPHENOCRYST olivine VESICLES THIN SECTION: 324-U1349A-14R-5-W 25_31-TS248 Piece No: COMMENTS SUMMAR serpentine green-brown clays calcite green-brown clays saponite saponite calcite STRUCTURE GROUNDMASS MINERALOGY green clay pyroxene SECONDARY plagioclase Opaque Minerals glass DESCRIPTION U1349A-14R-5, 25-31 cm, TS 248 cm, 25-31 U1349A-14R-5,

Proc. IODP | Volume 324 41 Site U1349 core descriptions Thin sections %; ine and OBSERVER:THIN SECTION:TS249 OBSERVER:THIN Unit:32 highly spherical olivine pyroxene plagioclase olivine olivine vesicle mode. REPLACING/FILLING COMMENTS -shaped morphology. Thin calcite veins are heterogeneously distributed and show pa rtly -shaped morphology. Y max.3 mode.0.5 MORPHOLOGY 1.2 0.3 COMMENTS subhedral to euhedral subhedral spinel inclusions max. 0.30.50.1 0.2 0.2 0.05 acicular anhedral subhedral min. 0.5 5SIZE(mm) 1 min. 100 100 60 65 20 fiber. composite or cross-fiber. thick calcite vein makes Y-shaped morphology. Thin calcite veins are heterogeneously distributed and show partly composite or c ross - morphology. Y-shaped thick calcite vein makes sparsely phyric basalt middle part of volcanic floe breccia microcrystalline [324] ophimottled,sparsely phyric PERCENTORIGINAL REL. VOL. REPLACED SIZE(mm) 1 1 25 25%; Crystallinity: 71 Sparsely phyric Ophimottled Basalt; Microcrystalline; middle part of volcanic flow breccia; Vesicularity 100 Polycrystaline and thick calcite vein makes 98 29 30 40 1 15 65 60 80 5 Alteration Degree: 74%; Vein Filling:calcite, blue-green minerals, Fe-oxides; Vesicle Filling: Saponite; Structure: Polycrystal Filling:calcite, blue-green minerals, Fe-oxides; Vesicle Alteration Degree: 74%; Vein

Y WHERE SAMPLED: GRAINSIZE: TEXTURE: PRIMARY MINERALOGY ROCK NAME: THIN SECTION: 324-U1349A-14R-5-W 53_54-TS249 Piece No: PHENOCRYSTSolivine MICROPHENOCRYST olivine 1 VESICLES MINERALOGY plagioclase pyroxene GROUNDMASS glass Opaque Minerals SECONDARY calcite green-brown clays green-brown clays saponite green-brown clays green clay saponite STRUCTURE COMMENTS SUMMAR DESCRIPTION U1349A-14R-5, 53-54 cm, TS 249 cm, 53-54 U1349A-14R-5,

Proc. IODP | Volume 324 42 Site U1349 core descriptions Thin sections snoisulcni lenips snoisulcni OBSERVER:THIN SECTION:TS250 OBSERVER:THIN lacirehps yletaredom lacirehps esalcoigalp lardehbus la rdehbus lardehue50.0 lardehna81.052.0 enexoryp ralucica enivilo enivilo ssalg vesicle Unit:32 2.0 1.1 2.0 1.1 1.0 6.0 3.0 4.1 4 SIZE(mm) min. max. mode. REPLACING/FILLING COMMENTS 4 001 001 01 02 03 100 001 02 03 01 01 51 21 polycrystalline cacltie veins. 80 Alteration 7%; Crystallinity: 34%; Sparsely phyric intersertal Basalt; Microcrystalline; middle part of volcanic flow breccia; Vesicularity Amygdaloidal structure with syntaxial zeolite and polycrystalline cacltie veins Degree: 76%; Vein Filling:calcite, saponite; Vesicle Filling: Saponite; Structure: Amygdaloidal structure with systaxial zeolite and Filling: Saponite; Structure: Filling:calcite, saponite; Vesicle Degree: 76%; Vein 5 7 68 1 2 sparsely phyric basalt microcrystalline [324] sparsely phyric,intersertal PERCENTORIGINAL REL. VOL. REPLACED SIZE(mm) min. max. mode. MORPHOLOGY COMMENTS COMMENTS SUMMARY STRUCTURE saponite saponite brown clays brown clays brown clays serpentine SECONDARY MINERALOGY calcite Opaque Minerals DESCRIPTION pyroxene GROUNDMASSglass 97 plagioclase VESICLES MICROPHENOCRYST olivine THIN SECTION: 324-U1349A-14R-6-W 64_67-TS250 Piece No: WHERE SAMPLED:GRAINSIZE: TEXTURE: middle part of volcanic flow breccia PRIMARY MINERALOGY PHENOCRYSTSolivine 2 ROCK NAME: U1349A-14R-6, 64-67 cm, TS 250

Proc. IODP | Volume 324 43 Site U1349 core descriptions Thin sections ciated ration OBSERVER:THIN SECTION:TS252 OBSERVER:THIN degree of alteration in plagioclase was estimated based on the outline of relic cry stals in reflected li g ht Unit:32 plagioclase olivine mesostasis sperulites vesicle vesicle 1.40.4 1.1 0.2 euhedral to subhedral subhedral 0.250.30.06 0.2 0.2 0.02 anhedral acicular subhedral 0.5 5 1 moderately spherical SIZE(mm) min. max. mode. REPLACING/FILLING COMMENTS 100 100 100 70 0 100 clast of basalts. Matrix-supported. Thick veins entrained host-basaltic clast. clast of basalts. Matrix-supported. Degree: 93%; Vein Filling: None; Vesicle Filling: Saponite and calcite; Cement: Calcite, saponite; Structure: Brec Filling: None; Vesicle Degree: 93%; Vein sparsely phyric basalt middle part of volcanic flow breccia microcrystalline [324] intersertal,sparsely phyric PERCENTORIGINAL REL. VOL. REPLACED1 SIZE(mm) min.1 15 max. mode. MORPHOLOGY COMMENTS 100 Alte 15%; Crystallinity: 42%; flow breccia; Vesicularity Sparsely Olivine Phyric Intersertal Basalt; Microcrystalline; Volcanic 98 20 20 1 59 70 100 100 95 5 Brecciated clast of basalts. Matrix-supported. 100

Y WHERE SAMPLED: GRAINSIZE: TEXTURE: PRIMARY MINERALOGY PHENOCRYSTSolivine 1 ROCK NAME: MICROPHENOCRYST olivine VESICLES THIN SECTION: 324-U1349A-15R-3-W 79_85-TS252 Piece No: GROUNDMASS pyroxene plagioclase opaque Minerals glass SECONDARY MINERALOGY brown clay COMMENTS SUMMAR non reflective opaque brown clay brown clay saponite calcite STRUCTURE saponite DESCRIPTION U1349A-15R-3, 79-85 cm, TS 252 cm, 79-85 U1349A-15R-3,

Proc. IODP | Volume 324 44 Site U1349 core descriptions Thin sections ration re: Thick OBSERVER:THIN SECTION:TS254 OBSERVER:THIN esicularity 10%; Crystallinity: 57%; Alte esicularity 10%; Crystallinity: 57%; Unit:32 mesostasis olivine pyroxene plagioclase vesicle olcanic flow breccia; V max.1.3 mode.0.3 MORPHOLOGY 1.0 0.2 COMMENTS euhedral to subhedral subhedral 0.050.25 0.010.22 0.15 subhedral 0.12 acicular anhedral min. 0.3 3SIZE(mm) 0.9min. highly elongate max. mode. REPLACING/FILLING COMMENTS p henocr y st and in art of g roundmass. 100 100 30 100 10 100 sparsely phyric basalt middle part of volcanic flow breccia microcrystalline [324] ophimottled,sparsely phyric PERCENTORIGINAL REL. VOL. REPLACED SIZE(mm) 1 2 10 30 Flow structure around relict Sparsely Olivine Phyric Ophimottled Basalt; Microcrystalline; V 97 1 44 30 25 100 100 100 10 100 polycrystaline calcite veins, thin cross-fiber veins are heterogeneously distributed. Degree: 73%; Vein Filling: Calcite, brown clay and trace zeolite; Vesicle Filling: Saponite; Cement: Calcite, saponite; Structu Filling: Calcite, brown clay and trace zeolite; Vesicle Degree: 73%; Vein

Y WHERE SAMPLED: GRAINSIZE: TEXTURE: PRIMARY MINERALOGY ROCK NAME: THIN SECTION: 324-U1349A-15R-4-W 104_110-TS254 Piece No: PHENOCRYSTSolivine MICROPHENOCRYST olivine 1 VESICLES GROUNDMASS MINERALOGY brown clay opaque Minerals glass plagioclase pyroxene SECONDARY saponite brown clay brown clay non reflective opaque saponite STRUCTURE COMMENTS SUMMAR DESCRIPTION U1349A-15R-4, 104-110 cm, TS 254 TS cm, 104-110 U1349A-15R-4,

Proc. IODP | Volume 324 45 Site U1349 core descriptions Thin sections fiber ation OBSERVER:THIN SECTION:TS255 OBSERVER:THIN coalesced vesicles esicularity 5%; Crystallinity: 48%; Alter esicularity 5%; Crystallinity: 48%; Unit:32 pyroxene spinel olivine plagioclase vesicle olcanic flow breccia; V 20.3 1.4 0.2 euhedral to subhedral subhedral spinel inclusions 0.30.150.09 0.15 0.1 0.05 anhedral acicular subhedral 0.5 4 1 low sphericity SIZE(mm) min. max. mode. REPLACING/FILLING COMMENTS 100 100 100 100 10 20 calcite veins are heterogeneously distributed. Clast supported breccias. Degree: 77%; Vein Filling: Saponite; Vesicle Filling: Saponite; Cement Components: Calcite and saponite; Structure: Thin cross- Filling: Saponite; Cement Components: Calcite and saponite; Structure: Filling: Saponite; Vesicle Degree: 77%; Vein sparsely phyric basalt middle part of volcanic flow breccia microcrystalline [324] sparsely phyric,intersertal PERCENTORIGINAL REL. VOL. REPLACED1 SIZE(mm) min.2 5 max. mode. MORPHOLOGY COMMENTS 100 Clast su pp orted breccias. Sparsely Olivine Phyric Intersertal Basalt; Microcrystalline; V 97 54 20 25 1 100 20 100 10 100

Y WHERE SAMPLED: GRAINSIZE: TEXTURE: PRIMARY MINERALOGY PHENOCRYSTSolivine 1 ROCK NAME: MICROPHENOCRYST olivine VESICLES THIN SECTION: 324-U1349A-15R-5-W 6_12-TS255 Piece No: glass GROUNDMASS pyroxene plagioclase Opaque Minerals SECONDARY MINERALOGY brown clay spinal saponite brown clay brown clay saponite STRUCTURE COMMENTS SUMMAR DESCRIPTION U1349A-15R-5, 6-12 cm, TS 255 cm, 6-12 U1349A-15R-5,

Proc. IODP | Volume 324 46 Site U1349 core descriptions Thin sections nd ation OBSERVER:THIN SECTION:TS256 OBSERVER:THIN Unit:32 pyroxene plagioclase glass olivine olivine spinel 1.80.5 1.2 0.3 euhedral to subhedral subhedral 0.150.2 0.10.06 0.1 0.03 acicular anhedral subhedral 0.5 3.5 1 low sphericity SIZE(mm) min. max. mode. REPLACING/FILLING COMMENTS 100 100 25 100 50 20 curved veins in basaltic clast. Degree: 67%; Vein Filling: Saponite; Vesicle Filling: Saponite; Cement Components: Calcite and saponite; Structure: Irregular a Filling: Saponite; Vesicle Degree: 67%; Vein sparsely phyric basalt middle part of volcanic flow breccia microcrystalline [324] intersertal,sparsely phyric PERCENTORIGINAL REL. VOL. REPLACED1 SIZE(mm) min.1 7 max. mode. MORPHOLOGY COMMENTS Sparsely Olivine Phyric Intersertal Basalt; Microcrystalline; Volcanic flow breccia; Vesicularity 7%; Crystallinity: 52%; Alter 7%; Crystallinity: 52%; flow breccia; Vesicularity Sparsely Olivine Phyric Intersertal Basalt; Microcrystalline; Volcanic 98 30 49 20 1 100 40 100 20 Irregular and curved veins in basaltic clast.

Y WHERE SAMPLED: GRAINSIZE: TEXTURE: PRIMARY MINERALOGY PHENOCRYSTSolivine 1 ROCK NAME: MICROPHENOCRYST olivine VESICLES THIN SECTION: 324-U1349A-15R-5-W 15_20-TS256 Piece No: GROUNDMASS plagioclase glass pyroxene opaque Minerals SECONDARY MINERALOGY brown clay COMMENTS SUMMAR brown clay brown clay chlorite saponite serpentine non reflective opaque STRUCTURE DESCRIPTION U1349A-15R-5, 15-20 cm, TS 256 cm, 15-20 U1349A-15R-5,

Proc. IODP | Volume 324 47 Site U1349 core descriptions Thin sections ation OBSERVER:THIN SECTION:TS257 OBSERVER:THIN Unit:32 glass pyroxene titano-magnetite olivine vesicle 1.10.4 0.9 0.3 euhedral to subhedral subhedral 0.40.30.09 0.15 0.15 0.05 anhedral acicular subhedral 0.1 0.9 0.4 highly spherical SIZE(mm) min. max. mode. REPLACING/FILLING COMMENTS 100 100 40 15 30 100 Degree: 74%; Vein Filling: None; Vesicle Filling: Saponite; Cement Components: None; Structure: No structure. Filling: None; Vesicle Degree: 74%; Vein sparsely phyric basalt middle part of volcanic flow breccia microcrystalline [324] intersertal,sparsely phyric PERCENTORIGINAL REL. VOL. REPLACED1 SIZE(mm) min.2 5 max. mode. MORPHOLOGY COMMENTS 15 No structure. Alter 5%; Crystallinity: 38%; flow breccia; Vesicularity Sparsely Olivine Phyric Intersertal Basalt; Microcrystalline; Volcanic 97 15 20 1 64 100 40 30 100

Y WHERE SAMPLED: GRAINSIZE: TEXTURE: PRIMARY MINERALOGY PHENOCRYSTSolivine 1 ROCK NAME: MICROPHENOCRYST olivine VESICLES THIN SECTION: 324-U1349A-15R-6-W 42_44-TS257 Piece No: GROUNDMASS pyroxene plagioclase opaque Minerals glass SECONDARY MINERALOGY brown clays brown clays brown clays saponite brown clays saponite STRUCTURE COMMENTS SUMMAR DESCRIPTION U1349A-15R-6, 42-44 cm, TS 257 cm, 42-44 U1349A-15R-6,

Proc. IODP | Volume 324 48 Site U1349 core descriptions Thin sections OBSERVER:THIN SECTION:TS258 OBSERVER:THIN found on the edge of breccia clast found on the edge of breccia clast Unit:32 glass olivine olivine plagioclase pyroxene olivine spinel 1.50.5 0.9 0.4 euhedral to subhedral subhedral 0.090.15 0.050.15 0.1 subhedral 0.1 acicular anhedral 0.5 3 1 low sphericity SIZE(mm) min. max. mode. REPLACING/FILLING COMMENTS 100 100 20 50 100 50 sparsely phyric basalt middle part of volcanic flow breccia microcrystalline [324] intersertal,sparsely phyric PERCENTORIGINAL REL. VOL. REPLACED1 SIZE(mm) min.2 5 max. mode. MORPHOLOGY COMMENTS in basaltic clast. 97 1 30 49 20 100 Irre g ular and curved veins in basaltic clast. Degree: Alteration 5%; Crystallinity: 52%; flow breccia; Vesicularity Sparsely Olivine Phyric Intersertal Basalt; Microcrystalline; Volcanic 75%; Vein Filling: Saponite; Vesicle Filling: Saponite; Cement Components: Saponite and calcite; Structure: Irregular and curved veins Filling: Saponite; Cement Components: Saponite and calcite; Structure: Irregular curved Filling: Saponite; Vesicle 75%; Vein

Y WHERE SAMPLED: GRAINSIZE: TEXTURE: PRIMARY MINERALOGY PHENOCRYSTSolivine 1 ROCK NAME: MICROPHENOCRYST olivine VESICLES THIN SECTION: 324-U1349A-16R-2-W 7_14-TS258 Piece No: GROUNDMASS opaque Minerals plagioclase glass pyroxene SECONDARY MINERALOGY brown clay saponite serpentine brown clay brown clay chlorite non reflective opaque saponite STRUCTURE COMMENTS SUMMAR DESCRIPTION U1349A-16R-2, 7-14 cm, TS 258 cm, 7-14 U1349A-16R-2,

Proc. IODP | Volume 324 49 Site U1349 core descriptions Thin sections OBSERVER:THIN SECTION:TS259 OBSERVER:THIN lardehbus ot lardehue ot lardehbus lardehbus50.090.0 lardehbus lardehna ralucica80.051.0 enivilo Unit:32 1.0 3.0 8.0 2.0 4.0 3.1 SIZE(mm) min. max. mode. REPLACING/FILLING COMMENTS 001 001 001 02 04 100 001 51 02 Degree: 87%; Vein Filling: Saponite; Vesicle Filling: None; Cement Components: Saponite; Structure: Irregular and curved veins in Filling: Saponite; Vesicle Degree: 87%; Vein 1 Irregular and curved veins in basaltic clast. Alteration 0%; Crystallinity: 37%; flow breccia; Vesicularity Sparsely Olivine Phyric Intersertal Basalt; Microcrystalline; Volcanic 1 0 64 1 basaltic clast. sparsely phyric basalt microcrystalline [324] sparsely phyric,intersertal PERCENTORIGINAL REL. VOL. REPLACED SIZE(mm) min. max. mode. MORPHOLOGY COMMENTS SECONDARY STRUCTURE COMMENTS SUMMARY MINERALOGY saponite opaque Minerals pyroxene plagioclase VESICLES GROUNDMASSglass 98 DESCRIPTION MICROPHENOCRYST olivine WHERE SAMPLED:GRAINSIZE: TEXTURE: middle part of volcanic flow breccia PRIMARY MINERALOGY PHENOCRYSTSolivine 1 ROCK NAME: THIN SECTION: 324-U1349A-16R-2-W 44_50-TS259 Piece No: U1349A-16R-2, 44-50 cm, TS 259

Proc. IODP | Volume 324 50 Site U1349 core descriptions Thin sections nity: 20%; OBSERVER:THIN SECTION:TS261 OBSERVER:THIN Unit:32 olivine olivine olivine glass olivine plagioclase vesicle 1.6x10.8x0.6 1x0.80.2 0.6x0.40.1x0.1 subhedral subhedral 0.1 0.1x0.10.2x0.020.05x0.05 0.1x0.02 subhedral 0.02x0.02 acicular highly spherical subhedral SIZE(mm) min. max. mode. REPLACING/FILLING COMMENTS 100 100 50 100 50 40 sparsely phyric basalt middle part of volcanic flow breccia microcrystalline [324] sparsely phyric,hyalophytic PERCENTORIGINAL REL. VOL. REPLACED1 SIZE(mm) min.1 2 max.7 82 mode.10 1 MORPHOLOGY COMMENTS 60 20 10 100 10 50 100 Sparsely Olivine Phyric Hyalophytic Basalt; Very fine grained; Middle part of volcanic flow breccia; Vesicularity 2%; Crystalli fine grained; Middle part of volcanic flow breccia; Vesicularity Sparsely Olivine Phyric Hyalophytic Basalt; Very Thick and thin veins are networked curved. Filling: Saponite or green clays; Cement Compone nts: Filling: Saponite, calcite and Fe-oxides; Vesicle Alteration Degree: 91%; Vein Saponite, calcite and Fe-Oxides; Structure: Thick and thin veins are networked curved. Saponite, calcite and Fe-Oxides; Structure:

Y WHERE SAMPLED: GRAINSIZE: TEXTURE: PRIMARY MINERALOGY PHENOCRYSTSolivine 1 ROCK NAME: MICROPHENOCRYST olivine VESICLES GROUNDMASSpyroxene glass plagioclase 98 opaque Minerals SECONDARY MINERALOGY green clay iddingsite brown clays green-brown clays calcite green-brown clays saponite green clay STRUCTURE COMMENTS SUMMAR THIN SECTION: 324-U1349A-16R-6-W 56_61-TS261 Piece No: DESCRIPTION U1349A-16R-6, 56-61 cm, TS 261 cm, 56-61 U1349A-16R-6,

Proc. IODP | Volume 324 51 Site U1349 core descriptions Thin sections nity: 23%; esicularity 2%; Crystalli de p end on the clasts OBSERVER:THIN SECTION:TS262 OBSERVER:THIN secondary minerals after olivine as rim around the vesicle g hl y curved. Unit:32 olivine olivine plagioclase glass vesicle vesicle ery fine grained; Middle part of volcanic flow breccia; V 2.2x20.8x0.6 1.2x0.80.2 0.6x0.6 subhedral 0.2x0.2 subhedral 0.3x0.02 0.1 0.1x0.10.05x0.05 0.2x0.02 0.02x0.02 subhedral acicular subhedral highly spherical SIZE(mm) min. max. mode. REPLACING/FILLING COMMENTS 100 100 50 40 0 100 Syntaxial, composite and polycrystalline veins are networked highly curved. Alteration Degree: 88%; Vein Filling: None; Vesicle Filling: Saponite and green clays; Cement Components: None; Structure: Filling: None; Vesicle Alteration Degree: 88%; Vein sparsely phyric basalt middle part of volcanic flow breccia very fine grained sparsely phyric,intersertal PERCENTORIGINAL REL. VOL. REPLACED1 SIZE(mm) min.1 2 max.10 10 mode.1 79 MORPHOLOGY COMMENTS 100 100 40 100 Sy ntaxial, com p osite and ol ycry stalline veins are networked hi Sparsely Olivine Phyric Intersertal Basalt; V

Y WHERE SAMPLED: GRAINSIZE: TEXTURE: PRIMARY MINERALOGY PHENOCRYSTSolivine 1 ROCK NAME: MICROPHENOCRYST olivine VESICLES GROUNDMASSpyroxene plagioclase opaque Minerals 98 glass SECONDARY MINERALOGY brown clays saponite green-brown clays green-brown clays saponite green clay STRUCTURE COMMENTS SUMMAR THIN SECTION: 324-U1349A-16R-6-W 77_83-TS262 Piece No: DESCRIPTION U1349A-16R-6, 77-83 cm, TS 262 cm, 77-83 U1349A-16R-6,

Proc. IODP | Volume 324 52 Site U1349 core descriptions Thin sections Thin nity: 18%; OBSERVER:THIN SECTION:TS263 OBSERVER:THIN saponite? Unit:32 olivine glass olivine plagioclase vesicle 1.6x0.6 1.2x0.60.8x0.60.8 subhedral 0.6x0.4 subhedral 0.2x0.1 0.20.05x0.05 0.1x0.1 0.02x0.020.3x0.02 subhedral 0.2x0.02 subhedral low sphericity acicular SIZE(mm) min. max. mode. REPLACING/FILLING COMMENTS 100 100 100 50 0 60 sparsely phyric basalt middle part of volcanic flow breccia very fine grained sparsely phyric,hyalophytic PERCENTORIGINAL REL. VOL. REPLACED1 SIZE(mm) min.1 3 max.84 5 mode.1 10 MORPHOLOGY COMMENTS 100 100 60 Thin veins are heterogeneously disrtibuted in basaltic clast. Sparsely Olivine Phyric Hyalophytic Basalt; Very fine grained; Middle part of volcanic flow breccia; Vesicularity 3%; Crystalli fine grained; Middle part of volcanic flow breccia; Vesicularity Sparsely Olivine Phyric Hyalophytic Basalt; Very Filling: Saponite; Cement Components: Saponite and calcite; Structure: Filling: Saponite; Vesicle Alteration Degree: 93%; Vein veins are heterogeneously disrtibuted in basaltic clasts.

Y WHERE SAMPLED: GRAINSIZE: TEXTURE: PRIMARY MINERALOGY PHENOCRYSTSolivine 1 ROCK NAME: MICROPHENOCRYST olivine VESICLES GROUNDMASSglass pyroxene opaque Minerals 98 plagioclase SECONDARY MINERALOGY serpentine? COMMENTS SUMMAR green-brown clays green-brown clays green-brown clays saponite STRUCTURE THIN SECTION: 324-U1349A-16R-7-W 64_71-TS263 Piece No: DESCRIPTION U1349A-16R-7, 64-71 cm, TS 263 cm, 64-71 U1349A-16R-7,

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