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Leg 197 Digital Photomicrograph Log

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Leg 197 Digital Photomicrograph Log The photomicrograph PDF filenames presented in the VOLUME\CORES\PHOTOMIC directory have been modified to conform to the 8.3 filenaming convention. The hyphen has been removed (e.g., the PDF file for photomicrograph ID# 1203-100 has been changed to 1203100.PDF). Please note that this log summarizes all photomicrographs taken during Leg 197, not just those included in this volume. Leg 197 Digital Photomicrograph Log Save image to local hard drive using format 1203-1 for image #1, 1203-2 for image #2, etc. Field of Image# TS# Hole Core Sec Interval Piece Light Filter View Feature Unit # Who? Pillow rind. See microlytic pl in core of varioles, 6 1203 A 19R-2 24-26 3 PPL B, N 1.4 3PT 1 surrounded by glass. 2 6 1203 A 19R-2 24-26 3 PPL B, N 5.5 Pillow rind. 3PT 3 6 1203 A 19R-2 24-26 3 PPL B, N 5.5 Glomerocrystic pl in glasssy groundmass. 3PT Glomerocrystic rounded plagioclase. Ol on LHS 4 7 1203 A 19R-2 136-138 15 XPL B, N 5.5 3PT psuedomorphed by magnesite. Cpx partially enclosing pl. Groundmass showing 5 7 1203 A 19R-2 136-138 15 XPL B, N 1.4 3PT subophitic texture. 6 1 1203 A 17R-4 34-38 10 XPL B, N 1.4 Olivine pseudomorphed by silica (?) 1PT Relict olivine showing several stages of alteration. 7 4 1203 A 19R-1 19-21 2A XPL B, N 1.4 3PT Interesting texture. 8 2 1203 A 18R-2 27-30 5 PPL B, N 1.4 Variolitic clast in carbonate interbed. 2PT 9 2 1203 A 18R-2 27-30 5 PPL B, N 1.4 Glassy clasts in carbonate. 2PT 10 8 1203 A 19R-5 13-15 2 PPL B, N 5.5 Skeletal olivine pseudomorph. 3 PT 11 1203 A 19R-5 13-15 2 PPL B, N 5.5 Olivine glomerocryst. Calcite vein at top. 3 PT Subophitic texture in groundmass- clinopyroxene 12 1203 A 20R4 44-47 1B XPL B, N 1,4 3PT partially enclosing plagioclase. Curved acicular clinopyroxene and opaque needles in 13 1203 A 26R1 10-12 1A PPL B, N 0.7 groundmass within segregation vesicle- indicative of 6PT quenching Curved acicular clinopyroxene and opaque needles in 14 1203 A 26R1 10-12 1A XPL B, N 0.7 groundmass within segregation vesicle- indicative of 6PT quenching 15 1203 A 26R1 10-12 1A PPL B, N 0.7 Skeletal opaque minerals with dendritic form. 6PT Pillow rind. See microlytic pl in core of varioles, 25 1203 A 31R-1 24-26 12 PPL B, N 0.7 8PT 16 surrounded by glass. Fresh olivine phenocrysts and a plagioclase 17 30 1203 A 32R-2 85-87 1E PPL B, N 5.5 glomerocryst, with ophitic clinopyroxene. A plagioclase 11 PT is visible below the centre. 18 30 1203 A 32R-2 85-87 1E PPL B, N 5.5 Olivine crystal showing strain bands. 11 PT Plagioclase glomerocryst showing late-stage 32 1203 A 32R-5 86-88 1C PPL B, N 2.75 11 PT 19 overgrowth. Plagioclase glomerocryst showing several concentric 20 32 1203 A 32R-5 86-88 1C PPL B, N 0.7 stages of growth 1. Core 2. Intermediate band. Now 11 PT replaced by clays. 3. Late stage overgrowth. Varioltic texture: skeletal plagioclase and comb texture 34 1203 A 35R-4 47-49 1F XPL B, N 0.7 14 PT 21 formed from parallel acicular clinopyroxene crystals. Representative image of fresh olivine phyric basalt 42 1203 A 37R-3 10-13 1A PPL B, N 5.5 16 PT 22 showing ophitic texture. Large fresh clinopyroxene phenocryst (part of 48 1203 A 42R-5 20-23 1A XPL B, N 1.4 19 PT 23 glomerocryst) showing olivine-like fractures. 24 4 1203 A 19R-1 19-21 15 RL B, N 0.5 Skeletal herring bone structure Magnetite-maghemite. 3 CRN 25 4 1203 A 19R-1 19-21 15 RL B, N 2.5 General reflected light picture. 3 CRN 26 6 1203 A 19R-2 24-26 2 RL XP B, N 1.25 Devitrified pillow margin. 3 CRN Titanomagnetite to Maghemite to Magnesite along 7 1203 A 19R-2 136-138 15 RL B, N 0.5 3 CRN 27 cracks 28 53 1203 A 51R-1 14-17 4 XPL B, N 0.7 Dendritic clusters of black oxides. 23?? PT 29 54 1203 A 51R-4 93-96 2A XPL B, N, Gray 5.5 Vesicles showing clear segregation rims. 23 PT Close up of segregated material outside vesicle 30 54 1203 A 51R-4 93-96 2A XPL B, N 0.7 showing acicular morphology of black oxides, including 23 PT oxide blades cutting plagioclase (top LHS), 31 57 1203A 52R 6 12-14 1B PPL B, N 0.7 Acicular black oxides ilustrating quenched texture. 23 PT Orbicular structure defined by plagioclase laths 32 57 1203A 52R 6 12-14 1B PPL B, N, Gray 1.4 surrounding round area of fine-grained segregated 23 PT material. 30 1203A 32R 1 85-87 1E RL N 0.5 Titanomagneite with maghemote alteration along 11 CRN 33 cleavage planes 30 1203A 32R 1 85-87 1E RL N 0.5 Titanomagneite with maghemote alteration along 11 CRN 34 cleavage planes 35 4 1203A 19R 1 19-21 1 RL N 1.25 Maghemite after titanomagnetite in Unit 3 3 CRN 17 1203A 25R 1 65-67 4C RL N 0.5 Titanomagnetite with ilmenite oxidation along 5 CRN 36 cleavage planes 19 1203A 26R 1 10-12 1A RL N 0.5 Unaltered titanomagnetite and secondary CRN 37 chalcopyrite 38 20 1203A 26R 3 39-41 1B RL N 0.5 Unaltered titanomagnetite and primary pentlandite 6 CRN 39 24 1203A 31R 1 29-31 4 XPL B 2.5 Zonation in plagioclase phenocrysts 8 CRN 40 30 1203A 32R 2 85-87 1E PPL BN 2.5 Cr-spinel inclusions in olivine 11 CRN 41 30 1203A 32R 2 85-87 1E RL N 0.5 Cr-spinel with titanomagnetite overgrowths 11 CRN 42 30 1203A 32R 2 85-87 1E RL N 0.5 Cr-spinel reacting to titanomagnetite 11 CRN 30 1203A 32R 2 85-87 1E RL N 0.5 Titanomagnetite with maghemite alteration along 11 CRN 43 cleavage planes 76 1203A 68R 4 29-30 4 XPL BN 5.5 Rounded plagioclase glomerocrysts in fine grained PT 44 groundmass 76 1203A 68R 4 29-30 4 PPL BN 1.4 Altered olivine phenocryst now replaced by FeOx PT 45 and amorphous clays 46 60 1203A 55R 1 122-125 7D XPL B 0.7 Alteration. Pumpellyite in vesicles JG 47 60 1203A 55R 1 122-125 7D XPL B 1.4 Texture of thin section JG 73 1203A 65R 4 21-27 3 XPL BN 1.4 Typical vesicle pattern: elongate-irregular vesicle PT 48 surrounded by smaller ones + segregated material 49 64 1203A 59R 2 99-102 2B XPL BN 2.5 Good example of subophitic texture PT 50 64 1203A 59R 2 99-102 2B PPL BN 2.5 Good example of subophitic texture PT 51 3 1203A 18R 3 46-48 4 RL N 0.5 Titanomagneite altered to maghemite CRN 17 1203A 25R 1 65-67 4C RL N 0.5 Titanomagnetite with ilmenite oxidation lamellae, CRN 52 showing the ilmenite 17 1203A 25R 1 65-67 4C RL N 0.5 Titanomagnetite with ilmenite oxidation lamellae, CRN 53 not showing the ilmenite 54 20 1203A 26R 3 39-41 1B RL N 0.5 Unaltered titanomagnetite and pentlandite CRN 6 1203A 19R 2 24-26 3 PPL BN 1.25 Glass (melt) inclusions in plagioclase from a CRN 55 glassy margin 56 30 1203A 32R 1 85-87 1E RL N 0.5 Ilmenite exsolution in titanomagnetite 11 CRN 57 30 1203A 32R 1 85-87 1E RL N 0.5 Same picture as 56, but rotated 90 degress 11 CRN 32 1203A 32R 5 56-58 1C XPL BN 2.5 Resorption of a plagioclase phenocryst that CRN 58 contains melt inclusions 59 34 1203A 35R 4 47-49 1F XPL BN 10 Zonation in plagioclase CRN 60 34 1203A 35R 4 47-49 1F XPL BN 2.5 Zonation in plagioclase CRN 61 42 1203A 37R 3 10-13 1A RL N 0.5 Cr-spinel with tiatanomagnetite overgrowth 16 CRN 62 48 1203A 42R 5 20-23 1A XP BN 10 Zoned plagioclase phenocrysts 19 CRN 63 73 1203A 65R 4 21-24 3 RL N 0.5 Titanomagnetite with maghemite rim 29 CRN 64 75 1203A 68R 3 16-18 4 RL N 0.5 Titanomagnetite with extensive maghemite alteration 30 CRN 65 76 1203A 68R 4 29-30 4 XP B 2.5 Zoned plagioclase phenocrysts 31 CRN 66 16 1203A 21R 1 139-141 12B XPL B 1.4 Cuspate shards in volcaniclastic 4f PT Cuspate shards in volcaniclastic. Note stretched shards 16 1203A 21R 1 139-141 12B XPL B 5.5 4f PT 67 on left hand side. Cuspate shards in volcaniclastic. Note stretched shards 16 1203A 21R 1 139-141 12B PPL B 5.5 4f PT 68 on left hand side. Fluidal strethced outlines show elongate vesicles in 16 1203A 21R 2 139-141 12B PPL 1.4 4f PT 69 pumice clast. Cuspate pumices in volaniclastics showing jigsawfit 13 1203A 21R 2 141-143 12B PPL BN 5.5 4f PT 70 fragments.
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