A New 1:250K Scale Unified Legend for Precambrian

eologic g a a l b s A new 1:250k scale unified legend o u t r i

n e

a y

m MGS for Precambrian rocks in Manitoba

1928 L. Chackowsky, T. Martins, M. Rinne, C. Couëslan and C. Böhm Manitoba Geological Survey

Summary Figure 1: Previous 1:250k scale bedrock geology legend Figure 2: Revised 1:250k scale bedrock geology legend (draft)

Intrusive Rocks Gabbro, diabase, diorite, norite Intrusive Rocks Volcanic Rocks & Derived Sediments Monzonite Proterozoic Phyllonite, mylonite, tectonite, cataclasite, Monzonite, monzogranite Diorite, quartz diorite, tonalite Arenites: quartz-plagioclase paragneiss, Proterozoic pB aZ1 pP schist pZ1 h) hornblende bearing monzonite to quartz aD h) diorite, quartz diorite, biote+hornblende- aS sandstone, biote gneiss, arkose The Manitoba Geological Survey (MGS) identified the Amphibolite pX Pegmate pBK mafic dikes (MacKenzie) uG Granite to granodiorite aV Undifferenated volcanic rocks aZ1h hornblende-bearing monzonite bearing Sedimentary Rocks pA m) mudstone, subordinate arenite q) quartz arenite, minor mudstone, monzonite to quartz g) garnet amphibolite P) megacrysc monzonite to monzogranite q) quartz diorite conglomerate Quartzite pXg granic pBL composionally layered uGl leucocrac monzonite h) amphibolite, diopside- &/or hornblende- x) biote gneiss with pyroxene pS Quartzo-feldspathic sandstone aV1 Felsic volcanic rocks bearing pQ Syenogranite, syenite Enderbite, enderbic gneiss need for a revised 1:250k scale bedrock geology legend pZ2 aE pXm mafic pBM mafic to ultramafic dikes uGN gneissic O) amphibolite with locally preserved pillow N) enderbic gneiss Tonalite to granodiorite, with tonalic to pSb biote-bearing (dominantly Molson) aV1P porphyric Felsic porphyric rocks (e.g. structures Quartz- to feldspar-porphyry g) enderbic gneiss, garnet bearing aT granodioric gneiss aR pBP porphyric hypabyssal) pR Monzodiorite to quartz monzonite S) schollen enderbite A) augen tonalite pSh hornblende-bearing pG Granite to granodiorite uT Granodiorite to tonalite aV1V volcaniclasc that is applicable to the entire province of Manitoba. Gabbro, diabase, diroite, norite pZ3 b) biote tonalite pB L) composionally layered gabbro Granite, leucocrac granite, quartz pSm magnete-bearing aT Granodiorite to tonalite Arenites: sandstone, siltstone, arkose, g) tonalic granofels pGb biote-bearing aG1 monzonite uB Gabbro, diabase, diroite, norite aV2 Intermediate volcanic rocks pS quartzofeldspathic paragneiss H) hybrid tonalite, tonalic gneiss pSq quartz sandstone Anorthosic gabbro, Metaconglomerate A) augen granite pGf fluorite-bearing pI aTf fluorite-bearing pC b) biote gneiss, meta-arkose h) hornblende tonalite anorthosite aV2V volcaniclasc h) hornblende bearing polymicc b) biote granite to granodiorite uU Ultramafic rocks h) hornblende bearing quartzofeldspathic L) tonalite to tonalic gneiss, layered Argillaceous sandstone to pGg garnet-bearing aTl leucocrac Most MGS field mapping programs are carried out at metaconglomerate Proterozoic and/or Archean h) hornblende-biote granite pW gneiss l) leucotonalite mudstone (e.g. turbidites) Ultramafic rocks N) gneissic metaconglomerate H) xenolith bearing granite, granodiorite pGh hornblende-bearing pU aV3 Mafic volcanic rocks aTo orthopyroxene-bearing m) magneferous quartzofeldspathic gneiss Amphibolite N) geneissic tonalite to tonalic gneiss Metamorphic Rocks Diorite, quartz diorite uA k) microcline granite tonalite (enderbite) M) quartzofeldspathic migmate and P) porphyric tonalite pC Conglomerate pGl leucocrac Metamorphic Rocks basalt and komaic pD m) magnete quartz diorite l) leucogranite aV3b scales of around 1:20k or 1:50k. In order to display this migmac gneiss x) hypersthene tonalite uY Metasedimentary rocks basalt aTH xenolith-bearing N) gneissic quartz diorite to granodiorite N) arkosic gneiss Gabbroic and mafic dykes (Molson N) gneissic granite to granodiorite gneiss pGo orthopyroxene-bearing Y) mylonic tonalite pCM monomicc (charnockite to opdalite) pY Metasedimentary rocks t) diorite to tonalite q) quartz arenite uB Swarm) P) porphyric and porphyroblasc granite aV3k komaite and komaic aTN gneissic x) pyroxene diorite X) pegmac granite, pegmate Ultramafic rocks pCP polymicc uA Amphibolite basalt type of information at 1:250k scale, unit shapes must be Tonalite to quartz diorite, granodiorite aU Conglomerate, volcanic derived (probably k) komaite, komaic basalt pA Amphibolite Enderbite pT A) augen tonalite Granodiorite, tonalite, quartz diorite pGH xenolith-bearing aD Diorite, quartz diorite uC Archean) aG2 s) ultramafic to mafic rocks, sapphirine aV3O pillow basalt pE x) gneissic ferrohypersthene enderbite b) biote tonalite A) augen granodiorite; felsic augen gneiss pF Iron formaon uN Felsic gneiss bearing pGN gneissic pAL layered amphibolite (quartz) diorite to simplified and assigned to regionally representative f) tonalite to granodiorite, fluorite-bearing b) biote granodiorite aV3P porphyric basalt aDg Granite, leucogranite Felsic volcanic rocks pFo oxide facies granodiorite Iron formaon H) hybrid tonalite, tonalic gneiss uG1 H) hybrid granodiorite to granic gneiss seriate or porphyric pF N) foliated granite, leucogranite aV1 F) volcanic fragmental rocks, related pGP Mylonite, tectonite, cataclaste aV3V volcaniclasc o) oxide facies iron formaon h) hornblende tonalite h) hornblende-bearing granodiorite pM sediments pFs silicate facies aDm magnete-bearing rock units. Using the previous 1:250k legend (Figure 1) s) silicate facies iron formaon l) leucotonalite, leucocrac gneissic tonalite l) leucogranodiorite pGX pegmac Granodioric gneiss to diatexite P) porphyric rhyolite Archean Intrusive Rocks N) gneissic granodiorite to gneissic tonalite, aDt diorite to tonalite Granite m) magnete tonalite to granodiorite uG2 Calc-silicate rock, marble, pN1 Felsic gneiss pG1 N) foliated granodioric gneiss locally migmac Y) mylonic volcanic rocks pK b) biote granite to granic gneiss N) gneissic to foliated tonalite to granodiorite dolomic marble pZ2 Syenite Sedimentary Rocks aX Pegmate aDx pyroxene-bearing g) gneissic garneferous tonalite-granodiorite P) porphyric, porphyroblasc, and Intermediate volcanic rocks for this purpose presented several problems. For f) granite, fluorite bearing Felsic to tonalic gneiss megacrysc granodiorite pN2 Intermediate gneiss aV2 pKx albite-pyroxene rock +/- quartz syenite Quartzo-feldspathic sandstone g) garneferous granite to granodiorite P) megacrysc biote tonalite to granodiorite uN A) augen gneiss pZ2q aS aXg granic ±garnet x) pyroxene granodiorite, gabbro marble aB Gabbro, diabase, diorite, norite H) hybrid granite b) biote ± hornblende gneiss x) clinopyroxene tonalite X) pegmate Mafic volcanic Rocks Monzodiorite to quartz pN3 Mafic gneiss aSb biote-bearing aXm mafic h) hornblende granite, aplite L) layered migmate gneiss, migmate aV3 pZ3 example, some unit names were not consistently Chloritoid schist F) mafic volcanic fragmental rocks, related pP Mudstone monzodiorite aBL composionally layered l) leucocrac granite Ultramafic rocks aH aSh hornblende-bearing pU Metasedimentary rocks sediments aG Granite to granodiorite aBP porphyric m) magnete granite, petmate uS O) pillowed basalt pZ3x pyroxene-bearing N) gneissic granite to granodiorite, granic monzodiorite aSm magnete-bearing applied throughout the province, and some names had Anorthosite, anorthosic gabbro P) mafic plagioclase-phyric flows Volcanic Rocks & Derived Sediments gneiss Undifferenated volcanic rocks aGb biote-bearing Anorthosic gabbro, Tonalite, tonalic gneiss aI Proterozoic / Archean aSq quartz sandstone aI P) porphyric and megacrysc granite, pV uT Volcaniclasc rocks and related pZ3M monzodiorite to quartz anorthosite aV4 pV Undifferenated volcanic rocks monzonite aGf fluorite-bearing leucogranite sedimentary rocks Sedimentary Rocks Argillaceous sandstone to connotations that were not appropriate for all regions in R) seriate to prophyric granite Rhyolite, dacite, pyroclasc rocks Migmate: mixture of granodiorite gneiss f) felsic volcaniclasc rocks aW aGg garnet-bearing Ultramafic rocks Ultramafic rocks, largely serpennized aM mudstone (e.g. turbidites) aU X) pegamc granite pV1 to tonalite gneiss, granite, tonalite i) intermediate volcaniclasc rocks pV1 Felsic volcanic rocks uC Conglomerate uU peridote pZ1 Monzonite aGh hornblende-bearing Metamorphic Rocks Granodiorite, granite, tonalite Granic and granodioric gneiss, Metagreywacke Argillaceous sandstone to aC Conglomerate which they occur. pG2 Intermediate volcanic rocks aW pV1P porphyric hornblende monzonite leucocrac b) biote granodiorite Mafic to ultramafic metavolcanic rocks aN1 migmate N) amphibolite-biote-garnet gneiss pZ1h uW aGl pV2 P) porphyric and aphyric basalt and to quartz monzonite mudstone Metasedimentary rocks H) hybrid granodiorite to granite gneiss uV3 T) tuffacious greywacke pV1V volcaniclasc aCM monomicc aY andesite D) laminated felsic gneiss aGo orthopyroxene-bearing h) hornblende granodiorite g) garneferous quartzofeldspathic gneiss Pegmate, aplite polymicc granodiorite l) leucocrac granodiorite Pillowed to massive mafic volcanic rocks Felsic porphyric rocks (e.g. Volcanic Rocks & Derived Sediments aCP Amphibolite pV3 X) felsic gneiss with abundant pegmate and aX pV2 Intermediate volcanic rocks pR aA N) gneissic granodiorite to tonalite k) basalt and komaic basalt aplite hypabyssal) aGH xenolith-bearing The revised 1:250k bedrock geology legend (Figure uV Undifferenated volcanic rocks P) porphyric and megacrysc granodiorite to O) pillow basalt aF Iron formaon aAL layered amphibolite Intermediate layered to migmac gneiss Quartz monzonite pV2V volcaniclasc aGN gneissic tonalite P) porphyric basalt Archean aZ1 pT Granodiorite to tonalite aN2 M) migmac paragneiss x) hypersthene granite (monzocharnockite) v) muscovite bearing granodiorite - granite Amphobolite, layered amphibolite Felsic volcanic rocks aFo oxide facies aGP seriate or porphyric Volcanicalsc rocks h) hornblende gneiss H) hypersthene granite and hybrid granite, Mafic volcanic rocks uV1 aM Mylonite, tectonite, cataclasite 2) imposes a more logical and consistent simplification pV4 aA d) garnet-diopside amphibolite pV3 pTf fluorite-bearing Anorthosic gabbro, anorthosite f) felsic volcaniclasc rocks m) mesocrac to melanocrac layered gneiss gneiss AFTaFs silicate facies aGX pegmac pI Andesite, interlayered tuff, i) intermediate volcaniclasc rocks f) amphibolite to gabbro, plagioclase basalt and komaic pTl leucocrac uV2 porphyric Mafic gneiss, in part migmac Syenite pV3b aN1 Felsic gneiss m) mafic volcaniclasc rocks aZ2 basalt minor basalt Calc-silicate rock, marble, aN3 orthopyroxene-bearing aK of regional bedrock geology that can be applied Calc-silicate rock, marble, dolomic g) amphibolite, garnet bearing, locally N) migmate, hornblende and hornblende- pTo dolomic marble aZ2 Syenite Greywacke and derived gneiss, migmate layered tonalite (enderbite) uV2O pillowed andesite pK marble biote gneiss pV3O pillow basalt aN2 Intermediate gneiss pW b) biote bearing greywacke and gneiss L) layered amphibolite, metagabbro, gneiss Monzodiorite quartz syenite x) albite-pyroxene rock ± marble Felsic to intermediate granulite, opdalite, aZ3 aZ2q x) pyroxene amphibolite x) monzodiorite, pyroxene-bearing pV3P porphyric basalt pTH xenolith-bearing Mafic to ultramafic volcanic aP Mudstone province-wide and updated at the end of each f) potassium feldspar bearing greywacke aO1 enderbic gneiss uV3 Mylonite, mylonic granitoid gneiss and gneiss rocks Monzodiorite to quartz aN3 Mafic gneiss Gabbro, layered metagabbro, diabase P) porphyric opdalite volcaniclasc pM g) garneferous gneiss, metagreywacke pV3V aZ3 aB dykes pD Diorite, quartz diorite monzodiorite h) hornblende bearing greywacke-derived Mafic granulite geoscientific field program or compilation project. Some Felsic gneiss, migmate gneiss a) anorthosic gabbro aO2 (quartz) diorite to aZ3x pyroxene-bearing f) plagioclase-phyric gabbro (agmate) pDg pN1 H) hybrid gneiss m) magnete bearing greywacke-derived granodiorite monzodiorite h) hornblende gabbro h) hornblende-bearing quartzofeldspathic migmate Metamorphosed shale and silty shale P) porphyric gabbro, diabase aP pDm magnete-bearing aZ3M monzodiorite to quartz compromise was necessary in producing the revised gneiss q) quartzofeldspathic greywacke, biote p) pyriferous siltstone and shale monzonite paragneiss x) pyroxene-phyric gabbro m) magnete-bearing felsic orthogneiss pDt diorite to tonalite N) semipelic paragneiss to metatexite with t) staurolite metagreywacke, schist Metaconglomerate, polymicc Quartzite aQ legend. For example, overly simplified unit names (such tonalite V) volcaniclasc greywacke aC conglomerate pDx pyroxene-bearing Intermediate gneiss Pegmate, pegmac granite V) volcanic conglomerate DR pN2 pX Felsic porphyry X) conglomerate with pegmac granite and aR as “metasedimentary rocks”) were retained for regions pegmate f) plagioclase porphyry q) quartz porphyry lacking more detailed information or interpreted geophysically (such as in areas below Paleozoic cover). Figure 3: Bedrock geology of the Flin Flon - Athapapuskow Lake region (resized from Figure 4: Bedrock geology of the Flin Flon - Athapapuskow Lake region using Some effects of applying the revised legend are original map at 1:62,500 scale; for comparison with Figure 4) revised 1:250k legend assignments (resized as in Figure 3)

102° 102° mS.1 ! uV3 mS.1 jV4 jV3.3 oV3.4 jV3.4 pT.1 pG1.2 pG1.2 pG1.2 pS Arthurs Tartan Swordﬁsh pBL pV3 jT.1 wW jBl jV1 pV pT pV1

! jV3.4 pW pG Legend Lake Lake Lake pV3O Naosap Lake illustrated in Figures 3 and 4. Both maps show regional ! pB jV3.4 wW pW jV1 mC oV3.4 pG2.1 Aim?e, Lac Legend

! pB.1 jV3.3 jBl jV3.4 pV3O pB

! oB Map Sheet: FF-ATHA pG jV3.4

! jV3.3 pG2.1 Early juvenile-arc and ocean-ﬂoor (ca. 1.90 to 1.88 ga) rocks Xenolith-rich gabbro to quartz diorite pV3 ! uV3 pB.8 pGl pB.3 pGl2.1 jV3.4 pG2.1 Intrusive rocks of arc aﬃnity (1.90-1.88 Ga ) pD pB

! Flin Flon Domain pG mS.1 jV3.3 pV3O Mikanagan ! uV3 Plutons pT jV3.4 jV3.4 jVm4 jV3.3 Flin Flon area, Map 2010-1 (Simard et al., 2012) Amphibolite pV3O Lake pV3

! jBl jV3.3 pG2.1 uV3 pCP pV3V Sedimentary Rocks pB.3 mC jVm4 PROTEROZOIC Pegmate, aplite pB.9 pV3V pV3

mS.1! ajX Cliﬀ Lake jBl jV3.4 Successor-arc and younger rocks pV1 bedrock geology in the Flin Flon - Athapapuskow Lake ! Embury Lake

pB pT.1 ! jV3.4 Post-Missi Group Intrusive Rocks mC jVm4 jV1 pT.4 Medium-grained, equigranular tonalite; quartz megacrysc pS oB Volcanic, intrusive and sedimentary rocks (1.92 to 1.87 Ga) pD pV1 pV3V ! Granodiorite, diorite, gabbro, monzodiorite, tonalite ajT tonalite pB jV1 pZ3.1 Juvenile Arc Rocks pV1

jV3.4 ! yG2 pV3O pS Quartzo-feldspathic sandstone

pGl2.1 jT.1 jV3.4 jV3.4 jV3.4 Alberts Lake pZ1 pV3O ! Undivided juvenile arc rocks pB jV3.4 pZ3.1

pB.3 jV3.4 uV3 Leucocrac tonalite intrusion breccia jV3.1 pV3O Bakers Lake !

pB.1 ! ! ! jV3.4 jVm4 jVm4 Weherlite, serpennized ultramaﬁc rocks, pyroxenite, ajTl

! ! ! ! ! ! ! ! ! !! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! jBl pZ3.1 yU pV3V ! yG1 hornblendite pG

106 fuDK2 ! ! V3 pZ3.1 pT.4 Maﬁc to felsic hypabyssal intrusions pB pV3P pZ1 jV1 ! yS.1 jV3.4 jV3.3 jV3.4 Gabbro jV3.2

! ! pG1.2 yC yS.1 ! pB.1 jVm4 pZ3.1 Weherlite, serpennized ultramaﬁc rocks, pyroxenite, ajB.1 pV3V !

yS.2 ! region. The legend beside Figure 3 comprises units ! jV1 Argillaceous sandstone to mudstone (e.g. turbidites) yS.2 yD hornblendite pD Nesosap Lake pW

! Tonalite, quartz diorite !

fuDK2 Vh3 ! jV3.3 pB.1 Biote-augite meladiorite; porphyric gabbro, melagabbro Quartz diorite intrusion breccia; quartz diorite jT.1 pC ! pB.1 pB ! yD yD ajD.1 pD pB ! ! fnV3 fsT pT.1 pB.5 pBL ! fcV3 pC ! Gabbro, diorite, porphyric diorite, diabase Alberts Lake yC ! jV3.4 pG2.1 pV pT ﬀV4 pB.5 Quartz-feldspar porphyry, massive to banded; granodiorite, Minor intrusions jB

! yS.2 fmVp3 ! jV3.4 yR pV1 pV3V pV3O

fsT jBl quartz diorite pV3 pV3O Nesosap Lake !

! Minor intrusions: gabbro, diorite, quartz diorite, tonalite, Conglomerate

! jV3.4 jVm4 pC jVm4 ajBh related breccias Composionally layered gabbro sills and intrusions pV3P ! jV3.4 pB.1

! ﬀVp4 ! Missi Group jBl

yD ! pD Leo Lake mapped in the Flin Flon domain, including subdivisions ! jV3.4 pG2.1 Lile

! jV1 ! Sandstone Intrusion breccia with quartz diorite to tonalite matrix, in part pG2.1 yS.1 jV1 yS.1 ajTh Rat Lake

! ﬀVp4 ! fuDK2 pegmac Volcaniclasc rocks, calc-silicate rocks pB ! yG1 ! jV3.4 pR fnV3 jBl jV4 pG pBL pR pCP polymicc

! pV3V Timber Vp1 ! pG2.2 Pebbly sandstone Quartz diorite, tonalite

! pG2.1 pG Wolf Lake ! pG2.1 fuDK2 V4 ! pR yS.2 ajD.2 Shoshonic tuﬀ, resedimented pV3V pB pD fuDK2 ! yS.2 jT.1 jV1 pT ! fuDK2 jVs4 yS.1 ! jVm4 !! pB pV3V

! jV3.3 jVm4 pT.1 Pebble to cobble conglomerate, with minor interbedded Gabbro, diorite: fine- to medium-grained, equigranular pB ! ! V3 jVm4 jVf4 pV3V Volcanic Rocks & Derived Sediments Vh3 jV3.4 jV1 yC sandstone and pebbly sandstone ajB.2 Felsic volcaniclasc rocks: tuff, lapilli tuff, breccia, pV3

! fuDK2 ! fnV3 ! jV3.4 jVf4 heterolithologic breccia, dacite tuﬀ pV1P pV1V ³ jVf4 pT.1

! fuDK4 pB.1 pG pV3O by assemblages and other information relevant at the ! ﬀVp4 jBl pT A! Flin Flon

! pZ3 V4 Pre-Missi Group intrusive rocks Volcanic rocks of arc affinity (1.90-1.88 Ga); associated pV1 ! jV1 pB ! 10A Intermediate volcaniclasc rocks: tuff, lapilli tuff, breccia, pB ffV1 V3 ! pZ3M

! pB.5 volcaniclasc and sedimentary rocks yS.1 jT.1 pB.5 pG1.2 Granite, granodiorite and quartz diorite jVi4 intermediate to felsic volcaniclasc rocks and ﬂows, derived pT ! pB pV1 Undiﬀerenated volcanic rocks fuDK2 ! yG1 ! Thompson Lake pV V1 Undivided volcanic and volcaniclasc rocks gneiss pV1

! ! jV3.4 ajV ! jBl jV3.4 pG1.1 pB fnV3 ffVp4 fuDK2 V3 Mafic volcaniclasc rocks: resedimented mafic tuff, lapilli tuff, pV3P jV3.4 ! ffV3 ! jV1 pV3O pV3P

! jVm4 pT.1 291 Flon Flon arc assemblage (>1.88 Ga) breccia; maﬁc wacke; pillow fragment breccia; heterolithologic Sucker Lake ! jVf4 pT ! V1 Heterolithic breccia

! breccia, dominantly maﬁc fragments; undivided maﬁc pV1

fnV3 yR ! pG2.1 pR ! jVm4 Synvolcanic Intrusive Rocks ajV4.1 pV3O pS pV3O fuDK4 yS.2 V1 jV3.3 jVf4 volcaniclasc rocks and ﬂows pV1 pV1V

! ! pR ! jB jVs4 Quartz-phyric tonalite to leucotonalite, minor quartz diorite fnV3 Channing pZ3 pG2.1 Rhyolite to dacite (flows, flow breccia) pB pB Bryan Lake pB ! flVx3 e fuV3 pV3 pV3V pR original 1:62,500 scale (note that the legends in Figures ! fuDK2 pB.1 fsT Felsic volcanic rocks pV3P pV1 V4 pR jV3.4 jB Felsic and intermediate volcaniclasc rocks and associated jV1 fuDK4 ! 291 wP ajV4.2 sedimentary rocks pB Murray Lake ! ffVp4 fuDK2 pB.5 pV3P pB pR jVi4 ! pV2V pV3V fnVi3 fnV4 yG1 pR jV3.4 jV3.4 Gabbronorite pV3 Bear Lake Whitefish ! jBl Arc-ri basalt (pillowed and massive flows): ferrobasalt, ! yS.2 pG jV3.4 jV1 fsB Mafic volcaniclasc rocks: plagioclase crystal-lapilli tuff, Lake V3 ! jV3.4 jV3.3 rhyolite crystal tuff; synvolcanic dykes and sills; gabbro, pB pV3P ! ! fuDK2 fuDK2 ajV4.3 pB pyroclasc breccia, pillow-fragment breccia ferrogabbro, quartz ferrodiorite sills pD Big Island porphyric ! flVx3 ! pB.5 jV1 pV1P ! yD fnV3 pB.1 Undivided Intrusive Rocks Lake pV1 pG ! jV1 Basalt, basalc andesite (pillowed and massive flows): fuDK2 ! jV3.3 pG1.2 Rhyolite flows pB pB Tapukok ! jV3.4 pB ! Felsic dikes and sills/intrusions, and possible flows, aphyric to tholeiic basalt, basalc andesite, gabbro, derived ajV1 Lake ! Pothook Lake pV3O ! fuDK4 amphibolite, calc-alkaline basalt, basalc andesite, boninite, Sleep Lake ! pG1.2 sparsely quartz-plagioclase-phyric pV3V 167 fnV3 ffVp4 fnV4 pR pG2.1 pV3V pR pV1V volcaniclasc ! layered to uniform amphibolite pD 1 and 3 are not equivalent). The legend applied to the oV3.4 ! ! fnV3 fuDK4 jV3.4 Basalt, basalc andesite, andesite, associated pillow breccias pV ! mS.1 Mafic dikes and sills/intrusions, aphyric to plagioclase-phyric pG pS ! wP ajV3.1 Evolved Arc Rocks

jVm4 ! jV3.4 ! jV3.4 jB fuDK2 pV3O fnV3 fuDK2 jV4 pB.5 Mysc Lake Assemblage pB ! V3 ! pB.1 ! yD yU fnV4 pV3P pU ! pB.8 Tonalite, granodiorite, diorite, intrusive sheets (rhyolite, quartz ! pG2.1 Intrusive rocks of ocean-floor affinity (ca. 1.90 Ga ) ! jV3.2 pG2.1 Cope Lake Volcanic Rocks pV3 ! ! eT diorite, diabase), gabbro to diorite ! fuDK2 flVx3 jB pV3 pV3V pG2.1 fuDK2 V4 ! Mafic and ultramafic sills and dikes ! ! pB.5 pB pG Intermediate volcanic rocks fnV3 yG2 Basalt flows, aphyric to plagioclase- and pyroxene-phyric; pV2 ! fnV3 pV3P pB ! jV3.4 fcV3 mafic volcaniclasc rocks Gabbro, diorite, fine- to medium-grained, equigranular; minor pB ! ! ffV3 fuV3 Milliken Lake pD pG2.1 fuDK2 jB aoB.1 diorite and quartz diorite Ocean Floor Rocks pG pV3V pB pG pB ! ! jVm4 pB.5 pB.5 pG ! fuDK4 jVs4 jV3.4 Undivided ocean-floor rocks: mafic volcanic and related ! V4 jVm4 jV3.4 same map area in Figure 4 has been simplified ! jV3.4 Eastern Hook Lake Succession ! oV3.1 ! yD Diabase, fine- to medium-grained intrusive rocks, amphibolite, mafic tectonite pV3V ! aoB.2 pB fuDK2 fnV4 ! Rhyolite flows and flow breccia, quartz-phyric to aphyric pV3V Kinghorn Lake pV2V volcaniclasc pT.1 eT ! ! fdV4 pB.1 pB.1 Vp1 ! fnV3 Gabbro, diabase sills and dykes pV3O ! pT ! ! wP jV4 Peridote oB pV ! yU flVx3 ! jV3.4 pU oV3.4 ! fnV4 Basalt flows, aphyric to sparsely plagioclase- and pyroxene- aoU.1 ! V3 jV3.4 pB ! ! jV3.4 Vh3 phyric; mafic and heterolithic volcaniclasc rocks

! fnV3 pB.1 Evolved basalts: massive and pillowed basalt, diabase; pB fuDK2 jV3.3 pT.4 pR ! V3 jV3.4 oV3.3 gabbro, derived amphibolite ! pB.6 Niyanun

! ! pB yR ffV3 jB pB.1 Mafic-ultramafic layered intrusions pV3P pB Mafic volcanic rocks ! jV3.4 Western Hook Lake Succession Lake pV3 ! jV3.4

! Nao Lake ! fuDK4 Gabbro, ultramaﬁc rocks pV3O jV3.2 MORB/back arc basin basalts: pillowed and massive basalt, pV3P pG pB ! mS.1 aoB.3 according to the revised 1:250k common legend. ! Maﬁc and heterolithic volcaniclasc rocks pG2.1 ! jV3.4 Big jV1 oV3.4 diabase; derived tectonite, breccia; plagioclase megaphyric ! V3 V4 V4 Persian pV3 pV3O fuDK2 yR Island pV1

! pV3V ! and aphyric basalt, gabbro; derived amphibolite pT Lake

! ! Lake jV1 jV3.4 pB.1 pT pM

! e Gabbro, leucogabbro, gabbroic anorthosite, anorthosite

yR ! fuV3 jVm4

! pV3 fu! DK2 ! !

! ! pG2.1 pB ! ! ! ! Rocks of Unknown Genesis Lucile Lake ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! jV1 aoB.4 ! pB ! fuDK4 fsB jV3.4 jV3.2 Rhyolite flows and flow breccia pG pB pV1 pV3O pillow basalt ! pB.1 V1 pV3O ! pT.1 Mafic to felsic volcanic, volcaniclasc and hypabyssal intrusive pT.4 jVm4 pV1 ! jV3.4 ! uV3 rocks, derived mafic gneiss pT pT.1 pG2.1 Pyroxenite, peridote ! oB wP pT pV3O pB.1 jV1 jV3.4 pB.3 Basalt flows, aphyric to plagioclase- and pyroxene-phyric pV3V pD ! pT.3 pT.1 V3 Volcanic rocks of ocean-floor affinity (ca. 1.90 Ga); associated pV3P porphyric basalt ! pG2.1 jV3.4 jV3.4 jVm4 volcaniclasc and sedimentary rocks ! pB jV3.4 pT.4 pB.3 pB.1 pB ! jVi4 pT.1 pZ3.1 Greywacke, mudstone, mafic tuff Clearwater Domain pG pV2V ! Douglas Formaon jV3.4 jV3.4 mS.1 aoW pB pG Nisto Lake pD ! PROTEROZOIC volcaniclasc pB.1 jV3.3 Mafic and heterolithic volcaniclasc rocks; aphyric to pV3V ! pG2.1 pT.4 pT pG2.1 jV3.3 pB.6 jV3.4 Sedimentary, volcanic and hypabyssal intrusive rocks (1.87 to pB ! pB.8 fdV4 plagioclase-phyric pillowed basalt flows. pG2.1 pB.1 jV3.2 Mafic volcaniclasc rocks White pV3 ! oV3.4 ! ! ! ! ! ! ! ! ! ! ! jV3.4 jV3.4 pB.3 1.83 Ga) pB ! ! ! ! ! pG2.1 aoV4 ajB.2 ajV4.1 ajV3.1! ! ! ! ! ! ! ! ! ! pT.1 jV3.4 Rocks of Uncertain Age pT Ledge pB pV pV3 Lake pV3O Note that MGS adoption of the new 1:250k bedrock ! ! ! ! ! ! jV3.4 pV3 pV3O ! ! pV3O aoB.4 ! ! ! ! ! ! ! ! ! pB.8 pT.4 Lewis Formaon ! ! ! ! ! ! ! Lake pB pT.4 pT.1 asV1 ajV4.2 atPi ajT ! ! ! ! ! ajV1 pT.1 pB.1 Supracrustal migmac hornblende gneiss and interlayered pV1P pV3 pV1 Intrusive Rocks ! ajV4.3 ! ! ! ! ! ! ! jV3.4 Massive and pillowed basalt flows, plagioclase (>10%)- and Undivided mafic flows wN1 pT pB.3 ajV3.1 ! ! pB.1 pB.3 flVx3 aoV3 hornblende-biote gneiss pD pT pB pG2.1 pB.3 asV1 ! ! ! ! ! ! pT.4 pyroxene (>5%)-phyric; minor volcaniclasc rocks pT pV1P pD pT

pT.1 ! ! ajV3.1 ajV3.1 ajV3.1 ! ! ! ! ! ! ! jV3.4 pG pV3V pV3 ajV3.1 pM pT ajV4.2 asB.1 pG2.1 pV3V pB pB ajV4.3 ajB.2 atPi asD.2 ! asT ajV3.1 Basalt, mostly aphyric pV1V pT.1 oV3.4 pZ3.1 ajV4.3 ajT ! pB.1 Hidden Formaon Intrusive rocks (1.88 to 1.83 Ga) pV3O pV3V pV1P B. C. Lake ajB.2 asV1 pT.1 pT.4 aoVm3 pZ1 Schist Lake ajT Bakers pV3 aoB.4 ajX asD.1 ! pT.1 Heterolithic mafic volcaniclasc breccia; well-bedded tuff Granite to granodiorite pV3 pB pR pX Pegmate pT.4 ! Narrows jV3.2 pX pB.3 ajV3.1 e asR fnV4 pG1 pV3 ! ajTh pG1.1 pT pG asS ! pT.1 ajV3.1 asB.1 ajV3.1 Aphyric and plagioclase±pyroxene-phyric/glomeroporphyric ajV1 ajB.2 jV3.2 aoVp3 basalt pB Blackjack geology legend does not: atPi ! pD pT oV3.1 pZ3.1 oB ajD.2 wP Massive and pillowed basalt flows, aphyric to plagioclase- Granodiorite pT Lake ajV3.1 ajV ajV4.3 pDt

! fnV3 pG2.1 pB.3 ajD.1 ajTl asV1 jV3.2 phyric, and associated breccia; mafic to felsic volcaniclasc pV pV1P pM oV3.1 ajV4.2 ajV3.1 rocks Pillowed basalt pV3 pV3 pT.4 oV3.4 ! asD.1 ! aoVo3 pV3O pB ajBh ajV1 jV3.2 aoB.4 ajV1 asD.1 Fe-Ti-P massive and pillowed basalt flows, amygdaloidal Tonalite to quartz diorite pV1 pU pG Granite to granodiorite Schist Lake asU.2 asT jV3.4 pT pB e asT fnVi3 aphyric to sparsely plagioclase-phyric pV1 pV3O pG2.1 ajT ajV1 ajV3.1 Athapapuskow basalt: massive flows, minor pillowed flows pB eT asD.5 ! aoAV3 pG pD pV1P pG Schist Lake ajD.1 ajX pX

e asB.1 asV1 oV3.4 pT.4 Gabbro, diorite, quart diorite and derived amhibolite pT ! pB pB.3 atPi asV1 Flin Flon Formaon pB ajV3.1 asD.1 pG1.1 pS Neso Lake oV3.1 oB asD.2 ! Rhyolite flows, massive, locally flow-banded, mostly quartz- Athapapuskow Twin pGl leucocrac ! ajV1 asS asD.2 pG2.1 1.90 to 1.88 ga contaminated arc rocks and rocks of unknown ajBh atP ffV1 and plagioclase-phyric; felsic volcaniclasc rocks Lake ! Ultramafic rocks: pyroxenite, melagabbro, peridote, pV1 pG ! ajT asT affinity (Mysc Lake assemblage) Lake pG2.1 pU serpennite pV1 pB.3 ! ! Massive and pillowed aphyric to plagioclase-phyric basalt Felsic plutonic rocks: granite, quartz-megacrysc tonalite pT pD pM Fox Lake oV3.4 xenolith-bearing

! acGq1 ajV1 ffV3 flows; mafic to felsic volcaniclasc rocks; minor rhyolite flows pV3 pT pGH pB.1 ! ajBh asTh asD.2 asD.1 eT ajB.1 ajD.2 pV3V pDt ajV4.3 asC atP ! oV3.4 pG1.3 Volcanic, intrusive and sedimentary rocks (1.92 to 1.87 Ga) pZ2 ! pV3O Kelly 1) Delete previous information. A user interested in a ajV4.3 asW asB.1 pW Mafic volcanicalasc rocks, mostly lapilli tuff and tuff breccia, Felsic hypabyssal rocks: rhyolite; leucotonalite; aphyric and Ocean Floor Rocks pV3V pCP asC ajV3.1 asT ! pB Lake ! ajV3.1 aoV3 ffVp4 plagioclase-crystal-rich; basalt flows and associated flow acGh1 plagioclase-phyric diabase; aplite; pegmate asD.2 10 Payuk Lake Undivided ocean-floor rocks: mafic volcanic and related Dodds Lake pGN gneissic

! pCP ajD.1 e breccia pV3 ! ajB.2 asB.1 fV3.1 Schist Lake ajBh intrusive rocks, amphibolite, mafic tectonite pD pBl ! Massive to bedded heterolithic lapilli tuff to tuff breccia, with Mafic volcaniclasc rocks: plagioclase-phyric crystal tuff, lapilli ! aoVp3 asW wP oV3.3 pBL pV3P pW

ajV3.1 asW aoV3 aoV3 ffV4 acV4 tuff, breccia pW pV3 pV3 Anvil Lake ! localized heterolithic felsic breccia, and bedded mafic tuff; aoVp3 ajV3.1 Oer Lake asC asS atP minor basalt flows Rocks of Unknown Genesis pV1P ajD.1 ! Tectonically laminated mafic rocks derived from amygdaloidal Mafic to felsic volcanic, volcaniclasc and hypabyssal intrusive Payuk Lake aoU.1 asD.5 asV1 ajV1 asV1 Hamell Lake Volcanic Rocks pU pB pV1P pG2.3 ! acV3 uV3 pV1 aoB.1 aoVp3 ajBh ajD.2 basalt, diabase and mafic tuff. rocks, derived mafic gneiss pB pDt pZ2 Syenite

! Plagioclase-phyric basalt ﬂows; aphanic to quartz- and ! particular area may choose to view the original polygon aoB.1 ajV3.1 fmVp3 plagioclase-phyric rhyolite ﬂows; associated volcaniclasc pB.3 pG2.1 pM

! pG1.1 oV3.3 pB

! pG oV3.1 ajB.2 aoV3 rocks Neoarchean to Paleoproterozoic granitoid rocks containing ca. 2.5 pB

! asS pW

! pV3 oV3.4 aoVp3 pG2.2 pT.4 Unassigned Volcanic Rocks ga zircons pB pV3P pT

! asW ! Granite pB.1 aoVm3 aoVm3 oV3.3 Maﬁc volcaniclasc rocks, heterolithoc volcaniclasc rocks, pG Bond ! asC anG1 aoW ! fuV3 basalt ﬂows, felsic and heterolithic volcaniclasc rocks pW Monzodiorite to quartz monzodiorite

asD.5 aoV3 pT.4 pDt pV3 Lake pT pZ3

! pG2.1 !

pG2.1 asC pV3P !

! pZ3 pZ3.2 aoVp3 asD.5 oV3.3 NATMAP Shield Margin Project area, Map A-98-2

eT pG2.4 asD.4 Athapapuskow Lake area, Map GR2014-1-1 (Syme, 2015) pT pT ! metadata to see previous descriptors or legend jV3.4 pT.4 ! PALEOPROTEROZOIC PROTEROZOIC pV3O pD aoB.1 jV3.4 ! monzodiorite to quartz monzonite asW Athapapuskow pG2.3 ! Tectonite Sedimentary, volcanic and hypabyssal intrusive rocks (1.87 to pZ3M oV3.3 pB ! pW ! 1.83 Ga) Lake aoVo3 Shear-zone rocks: maﬁc and felsic tectonite pV3O oB oV3.3 oV3.3 pV3O ! aoV3 aoV3 atP Missi Metamorphic Suite aoB.1 ! pB

! Sandstone, siltstone, mudstone and derived pV3O asD.5 aoV3 pG2.3 ! jVm4 asC pG1.3 mS.1 quartzofeldspathic gneiss and migmate pV3V pT.4 ! Northeast Arm shear zone pG2.4 ! pG2.1 pT aoB.2 pGN Lynx Monzonite

! ajB.2 Tectonite and mylonite with maﬁc and felsic intrusive rocks pZ1 aoVo3 ! pT.4 atPi Polymicc conglomerate, sandstone, conglomerate gneiss, Lake pZ2 ! oV3.3

! aoVp3 asW mC pV3P pV3V ! local psammic gneiss, undiﬀerenated conglomerate and assignments, or view other compilations such as the ! pG2.4 aoB.1 aoV4 pG1.3 pS pCP pB pG

derived gneiss

! !

asS asD.5 aoB.2 ! oV3.3 oV3.3 ! Mylonite pyroxenite and gabbro/quartz diorite pCP pB !

! Rocks of Uncertain Age ! oB ajB.2 aoB.1 aoVo3 pB pB pV3O ! 1.86 to 1.84 ga middle successor-arc volcanogenic sedimenatry Athapapuskow ! Athapapuskow Maﬁc tectonite, phyllonite, mylonite, maﬁc phyllonite ± pV3O pG2.4 ! pG2.1 oB ! pV3 Felsic porphyric rocks (e.g. hypabyssal) ajB.2 acV3 ajB.2 ! and intrusive rocks; Missi Group siliciclasc rocks wP carbonate, cataclasite pB pB pR

oV3.1 ! ajV3.1 Lake aoB.2 pG2.3 ! pB Lake ! asC aoB.4 aoB.4 oB

oV3.3 Post-Missi Group Intrusive Rocks pG !

pG2.1 ! ajTh oV3.3 Greywacke, siltstone, mudstone, tuﬀ; derived biote gneiss ± pG aoVo3 pG2.3 Sparsely plagioclase-phyric trachyandesite sills ! pG2.3 aoAV3 wW ! asV2 garnet ± sillimanite, quartzofeldspathic gneiss pW pV3 asW asC Millwater oV3.3

! e aoVo3 ! map shown in Figure 3. ajD.2 ! pDt pB

asD.5 pV3 ! acV3

! Missi Group (1842-1847 Ma) pG2.1 Intrusive rocks (1.88 to 1.83 Ga) pA pT Granodiorite to tonalite

! aoB.1 oV3.3 oV3.3 pB.9 asU.1 aoB.2 aoB.2 ! Sandstone, tuﬀaceous sandstone, minor mudstone, siltstone Felsic tectonite, mylonite; felsic phyllonite, quartz-sericite ± pB asC asS pP First ! carbonate schist pT jV3.4 ! pV3O

aoV4 aoVo3 oB Cranberry wP pV3V Cranberry !

ajTh ! oV3.3 pB ajB.2 ! aoAV3 oV3.3 Portage Pebble conglomerate, polymicc pebble-cobble Dykes and dyke complexes: aphyric and porphyric felsic- Lake ! ! acV3 !A pB acGh1 ! asC conglomerate, pebbly sandstone pR intermediate dykes; quartz- to feldspar- porphyry oB

! aoB.4 Diorite, quartz diorite pZ3.2 aoVo3 ! Athapapuskow pZ3 pV3O Athapapuskow pM pD

! aoAV3 aoAV3 Granite

! oV3.3 Pre-Missi Group intrusive rocks and intrusive rocks of unknown pG2.1 oV3.1 Athapap pP e aoAV3 Lake pG1.1 pG pB Lake

! acGq1 age

aoAV3 !

acGh1 pP Neso Lake pluton ! wP asS ! Granite to granodiorite oV3.3 Pyroxenite, melagabbro, gabbro Newman pDt diorite to tonalite ! ajB.2 pP wP pG1.2

eT ! asU.1 pS Lake !

2) Modify more detailed geoscience data. For ! pB.1 pP ajB.2 aoB.4 wP Syenite to monzonite pGH pB pB pM

! ! ! wP pP Pyroxenite, melagabbro, gabbro pG1.3 pU

! acV4 ! Diorite, gabbro, related intrusion breccia pV3V

acGh1 acGh1 asU.1 asV2 pT.4 asD.1 pV2 ! pB ! Leucogranodiorite to tonalite Gabbro, diabase, diorite, norite

pT.4 uV3 pGl2.1 Athapapuskow pV3 pB !

acGh1 !

Biote-hornblende quartz diorite, related intrusion breccia ! pT

acV4 ! asD.2 Lake pV3V

! ! ! Granodiorite to tonailte

! asS !

! Athapapuskow ! aoB.2 pG2

! aoVo3 !

! ! uV3 Tonalite, quartz diorite

example, units mapped at 1:20k or 1:50k scale are not ! aoB.3 pG2.1 composionally layered

Lake aoAV3 aoB.1 pT.4 pT asT pT pB pB pBL !

eT ! Granodiorite pT pV3

! ! uV3

pT.4 acGq1 ! pG2.1

! ! !

! Athapapuskow uV3 Dikes, sills and minor intrusions ! ! uV3 aoB.2 ! Granodiorite to tonailte

! ! ajB.2 Quartz diorite, gabbro pB ! pT pG2.2 oV3.1 ! ! ! Lake asD.4

! pG2.1 pB ! ! Ultramaﬁc rocks

oB! pU pB ! pG2 ! Athapapuskow aoB.2

! ! ! oV3.1 Pyroxenite Granodiorite to tonailte: xenolith-rich phase Athapapuskow Athapapuskow

oV3.3 pB.1! Lake asU.2 pG2.3 pV3O restricted to the common 1:250k legend. ! wN1 Lake pN1 pG2 ! fV3.1 Lake

! aoB.2 ! Pyroxenite Foliated and gneissic granodiorite to tonailte ! pG1 pG2.4 Metamorphic Rocks Diabase

oV3.1 ! atP asB.1

pB pB pM pG pB ! Tonalite

pB pT.1 ! ! ! !

! Mafic plagioclase porphyry dikes ! ! pG2 ! ! asR Amphibolite pB ! ! Leucotonalite pG pA ! ! ! pG2.1 uV3 pT.3 ! wN1 pV3 ! ! Intrusion breccia with fine-grained mafic matrix; associated ! uV3 oV3.1 ! oV3.1 fV3.1 asTh with leucotonalite-rhyolite ! ! Tonalite to quartz diorite pV3 ! ! anG1 uV3 pT.4 jV3.1 oB ! ! ! ! Aphyric and porphyric rhyolite dikes; fine-grained ! ! ! asV1 leucotonalite Mylonite, tectonite, cataclasite ! ! oV3.1 Monzodiorite to quartz monzonite pV3 pM 3) Remove the option to highlight local features. For ! ! ! aoB.2 wN1 ! ! ! ! pZ3 pZ3 Epiclasc and volcanogenic sedimentary rocks ! Conglomerate, pebbly wacke, greywacke Quartz monzonite ! pG1 pZ3.1 pZ3M pG2 aoB.2 asC oV3.1 ! pG1

! fV3.1 Monzodiorite to quartz monzodiorite pV3 pN1 Felsic gneiss oV3.1 oV3.1 1.88 to 1.86 ga early successor-arc volcanic, sedimentary and pZ3.2 pG pN1 ! ! ! ! ! ! ! ! ! ! wN1 intrusive rocks ! pB wN1 example, ultramafic units too small to display at 1:250k Mafic sills Composionally layered gabbro, gabbronorite, ferrogabbro, pB pBl quartz ferrodiorite, ferrotonalite, leucotonalite, melagabbro; pG1 pB pB Quartz diorite, tonalite, magneferous ferrodiorite, feldspathic pG oV3.1 asD.5 diorite heterogeneous mulphase gabbro, diorite Goose Lake Gabbro, diorite, quart diorite and derived amhibolite Goose Lake fV3.1 wN1 pB pG1 Epiclasc, volcaniclasc and volcanic rocks pG pN1 oV3.1 pU Andesic and felsic greywacke; siliceous siltstone, mudstone; pU pG1 Gabbro, diorite pB pB fV3.1 wN1 asW minor mafic pillowed flows pZ3M pN1 pZ3 pB pB pU pB.1 pB jV3.1 pG1 wN1 pV3 scale will continue to be marked with point features pG1 pG Diorite pG1 pB.3 pG

102° Diorite to quartz diorite 102° pB.5

Diabase, diabase dyke complex wherever relevant. pB.6 Flin Flon--Athapapuskow km km Flin Flon--Athapapuskow km km 0 5 10 15 20 25 0 5 10 15 20 25