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BC Geological Survey 93 94 95 96 97 98 99 01 600000E 03 02 04 Cardigan Rocks 06 Raglan Point 36 08 35 34 Geology, Geochronology, Lithogeochemistry and Metamorphism of the Quatsino-Port McNeill Area, Northern Vancouver Island JIqpo lmJH uTrP uTrQ TrJN uKN 610000E Tribune Rock 0 uTrmKh 11 Boyle 12 Island uTrlKp 13 NTS 092L/11 and parts of 92L/05, 12 & 13 lmJH -500 uTruKf uTruKf -1000 uTruKf G.T. Nixon, J.L. Hammack, V.M. Koyanagi, G.J. Payie, A.J. Orr, J.W. Haggart, M.J. Orchard, E.T.Tozer, R.M. Friedman, D.A. Archibald, J. Palfy and F. Cordey TrJN uTrmKh? 14 Crane Islands uTrP -1500 15 (no vertical exaggeration) PALEONTOLOGY by M.J. ORCHARD, E.T. TOZER (Geological Survey of Canada) J. PALFY (Hungarian Natural History Museum) F. CORDEY (University of Lyon) 16 Hussar Point 33 uTruKf 500 09 George Rock Balaklava Lake GEOSCIENCE MAP 2011-2 F metres 1000 07 Scarlett Point Holberg Fault E 05 Bell 17 Island 18 Heard Lucan 32 Boxer Point Islands 19 Island Go Point Nolan Jerome Island 31 620000E rd on Port Hardy Noble Islets Blyth Islands Port McNeill 21 Isl an ds Port Alice 22 563000N Duncan 26 27 29 LAYERED ROCKS Canada USA Nanaimo 2011-2 2011-1 28 2011-3 2011-4 2011-5 630000E 28 31 Frankham Point 0 32 100 16 36 Numas Staples Islet 38 39 41 Massive conglomerate with minor lenses of coarse-grained lithic wacke uKBcg 23 Daphne Point 33 28 25 31 80 43 22 Peel Island 5620000N 19 R u Bear Cove 12 Twin Rocks 10 20 Cu nn Cre ingh ek am Jensen Cove 29 r iv e Patrician Cove Cunningham Lake l T su 18 qu a te 18 35 60 River 10 20 53 34 37 36 32 Glenlion 45 16 th B oo 34 Dick ick 50 36 Creek Malcolm Point 14 Bere Point 15 31 15 Black Bluff 30 mJHf 14 14 51 False Head 83 39 55 13 Ri r ve 13 46 Creek 5 44 bell 12 40 Caledonia 52 41 Quatse 87 45 09 58 76 29 40 64 15 43 ek 15 20 40 Frances Lake Orr Island 18 20 Ledge Point Long 73 Straggling Haddington Island lJLm 7 07 Lake Beaver Lake 14 Islands 05 Michelsen Point lJLx 32 28 50 Creek 05 84 Thorp Point 34 Co e tk wa 50 50 Hankin Point 52 14 20 Col ony 55 a 40 Kultah Point 32 24 38 23 ee k 22 35 28 50 76 50 O'Connor Lake k ee 40 59 Ohlsen Point 55 99 45 Lindgren Point 43 53 Ildstad Islands 50 42 66 71 ok Kokwina Cove Cross Island we Cr 34 16 45 Newcomb Rocks 75 30 26 86 52 36 42 Holloway 67 Point 62 75 Norgar Islet Lakken Point 20 94 26 53 17 40 94 Smi th 47 ve C 27 Se 97 98 99 14 15 16 17 18 19 620000E 21 22 24 23 25 26 27 29 28 630000E 31 32 33 34 35 36 37 38 39 C 41 640000E D Holberg Fault Zone Mount Byng 1000 k re e 20 93 500 37 -500 (MgO>12 wt %) Picrite < 53 Basalt _ < 53 Flooded land (swamp) Island Copper pit (flooded) Stream or river Contour (100m) Spot height (m) Road (gravel) Road (paved) 1º 13' Approximate mean magnetic declination February 2011 for centre of map area: 18 degrees 29 minutes east, decreasing annually 12.9 minutes per year Muller, J. E. and Roddick J. A. (1983): Geology, Alert Bay - Cape Scott, British Columbia; Geological Survey of Canada, Map 1552A, scale 1:250 000. Muller, J. E., Northcote, K. E. and Carlisle, D. (1974): Geology and mineral deposits of Alert Bay - Cape Scott map area, Vancouver Island, British Columbia; Geological Survey of Canada, Paper 74-8, 77 pages. lJLm? uTrP uTrQ 02 03 04 uTrQ -1500 (no vertical exaggeration) 05 90 90 06 uTrP uTrQ uTruKf uTruKf uTrmKh? uTrP uTrQ mJHm Base map produced from digital TRIM (Terrain Resource Inventory Management) 1:20 000-scale topographic database, British Columbia Ministry of Natural Resource Operations. Basaltic Andesite >53 _< 57 Andesite >57 _< 63 North American Datum 1983 (NAD83). Universal Transverse Mercator Projection (Zone 9). Elevation in metres above mean sea level. Contour interval 100m. IUGS Classification Mesonorm vs CIPW Q 60 DaciteRhyolite > 63 Plutonic Rocks ag gd g Notes tn All isotopic dates are calculated using the decay constants recommended by Steiger and Jäger (1977); recent estimates of K decay constants would increase the 40 Ar/ 39Ar age by ca. 1%. 20 aqs Least altered A P A qs qm qmd/ qmg qdi/ qgb 5 P as sy mz md/mg di/gb ag, alkali-feldspar granite; g, granite; gd, granodiorite; tn, tonalite; aqs, alkali-feldspar qz syenite; qs, qz syenite; qm, qz monzonite; qmd/qmg, qz monzodiorite/qz monzo-gabbro; qdi/qgb, qz diorite/qz gabbro; as, alkali-feldspar syenite; sy, syenite; mz, monzonite; md/mg, monzodiorite/ monzogabbro; di/gb, diorite/gabbro * High proportions of veinlets and/or amygdule fillings, or pervasive fine-grained alteration, commonly involving chlorite, epidote, albite, calcite, quartz, sericite, prehnite, zeolites and clay minerals, and less commonly actinolite, potassium feldspar and pumpellyite. TrJN Glenlion River Pluton Quatse Lake Pluton Rupert Inlet Pluton Digital Cartography G. T. Nixon uTruKf lmJHvs uTruKf JIqdi-gd Magnetic Declination Base Map Information Ross, K. V., Friedman, R. M., Dawson, K. M. and Leitch, C. H. B. (1996): U-Pb zircon ages of the Island Copper deposit intrusions, northern Vancouver Island, British Columbia; Geological Survey of Canada, Paper 1996-A, pages 111-117. uKN uTrP Magnetic North Palfy, J., Mortensen, J. K., Smith, P. L., Friedman, R. M., McNicoll, V. and Villeneuve, M. (2000): New U-Pb zircon ages integrated with ammonite biochronology from the Jurassic of the Canadian Cordillera; Canadian Journal of Earth Sciences, Volume 37, pages 549-567. Major Intrusions Wanokana Creek Pluton uTrQ TrJBvs? 91 Lyons Point lKL uTrP 0 -1000 01 Lake Middle Jurassic TrJN uTrQ MINFILE locality (092L 052) Topography 96 JIpo uKBcg 92 600000E Mineralization Jeletzky, J. A. (1976): Mesozoic and ?Tertiary Rocks of Quatsino Sound, Vancouver Island, British Columbia; Geological Survey of Canada, Bulletin 242, 243 pages. PORT HARDY uKBcg 22 clae Creek 96 metres 1500 33 Mahwh ie e 95 13 B 72 ek Cre di n Creek ia n wu ie od 90 94 12 A 22 55 93 11 Retrograde zeolite mineral assemblages: Lm, laumontite (X-ray diffraction determination by M. Chaudry) Janousek, V., Farrow, C. M. and Erban, V. (2006): Interpretation of whole-rock geochemical data in igneous petrology: introducing Geochemical Data Toolkit (GCDkit); Journal of Petrology, Volume 47, pages 1255-1259. Severely altered * 10 Co Sk i 91 610000E 95 26 93 92 Classification SiO 2 wt % 15 Julian Cove Lm Dark grey-green to pale pinkish grey, medium to coarse-grained, equigranular granitoid rocks and porphyry; includes hornblende±biotite-bearing quartz diorite (qdi), granodiorite (gd), plagioclase±hornblende porphyry (po) and quartz-plagioclase±biotite porphyry (qpo); combined codes indicate a range of common rock types (qdi-gd, quartz diorite - granodiorite) Haggart, J. W. and Tipper, H. W. (1994): New results in Jura-Cretaceous stratigraphy, northern Vancouver Island, British Columbia; Geological Survey of Canada, Paper 1994-E, pages 59-66. Bergh Cove conglomerate: grey-green to brownish grey, massive to thinly bedded, heterolithic pebble and cobble conglomerate; moderately well to poorly sorted; framework and matrix-supported volcanic and sedimentary clasts Alkali metasomatized 14 J ul 09 33 Kultus Cove 08 13 15 Pender Point Prehnite-pumpellyite facies mainly: pumpellyite±prehnite+chlorite+albite ±epidote±quartz±calcite Greene, A. R., Scoates, J. S., Weis, D., Katvala, E. C., Israel, S. and Nixon, G. T. (2010): The architecture of oceanic plateaus revealed by the volcanic stratigraphy of the accreted Wrangellia oceanic plateau; Geosphere, Volume 6, pages 47-73. Dark grey-green, plagioclase-megacrystic basaltic to andesitic pillowed flows; texturally similar to unit lJLx Volcanic Rocks 20 07 22 90 Banter Point Bland Island 47 Atkins Cove 70 82 33 47 22 73 Upper greenschist facies: actinolite+chlorite+albite±epidote±quartz ±calcite 35 40 45 97 35 Geochronology Metamorphism Steiger, R. H. and Jäger, E. (1977): Subcommission on geochronology: convention on the use of decay constants in geo- and cosmochronology; Earth and Planetary Science Letters, Volume 6, pages 359-362. k 38 (P) Primitius K/Ar date (Ma, 2 sigma error); WR, whole-rock (Breitsprecher and Mortensen, 2004) Dark grey-green, closely packed, pillowed basalt flows and localized, massive inflated flow lobes; typically aphanitic and non-amygdaloidal; may include inter-pillow or rare thin lenses of well-bedded hyaloclastite Breitsprecher, K. and Mortensen, J. K. (2004): BCAge 2004A-1: a database of isotopic age determinations for rock units from British Columbia; BC Ministry of Energy and Mines, Open File 2004-3 (Release 3.0). 98 24 Early Bird Cove 47 Conodont Zone: date (Ma, 2 sigma error); Hb, hornblende; Bi, biotite; Pl, plagioclase; Kf, K-feldspar (determined by D. A. Archibald) Selected References WHOLE-ROCK GEOCHEMISTRY LEGEND ee (K) Kerri; (C) Cordilleranus; 4.3 (±0.8) WR 45 40 sta Ammonite Zone: 44 40 Kw TrJBcg H Hauterivian; B Barremian 40Ar/ 39Ar Dark grey-green, clinopyroxene-plagioclase±olivine porphyry coeval with mineralogically similar lavas in the lower part of the Bonanza Group (units uTrPfvmc/uTrPvfmc/uTrPfmc) 99 Riv er Quattische Island 30 Pamphlet Cove 51 60 44 Evenson Point 98 42 Keo gh Sara Lake 80 36 Bergh Cove Sherberg Jesdal Islands Islet 35 5600000N 40 40 36 01 Cretaceous: 160 (±1.4) Kf Dark grey-green, plagioclase-megacrystic basaltic dike/sill coeval with texturally similar lavas (lJLx) in the Le Mare Lake volcanic unit Interbedded volcaniclastic and sedimentary strata (predominantly submarine): buff to grey-green, thin to very thickly bedded, calcareous to non-calcareous, volcanic breccia, lithic and feldspathic wacke, siltstone and limestone, locally coralline; lithiccrystal tuff, lapilli tuff and reworked equivalents; and minor vitric tuff, pebbly sandstone, siltstone, and volcaniclastic debris-flow deposits; may include black carbonaceous shale, mudstone, siltstone and limestone (locally coralline) equivalent to unit TrJY in the Mahatta - Alice Lake area (Geoscience Maps 2011-3 and 2011-4) TrJBvs 55 44 Hecate Cove Cr Cr 5600000N Aw eis h 40 47 k Cree Lak e Makwazniht Island Dark grey-green, massive to medium bedded, basaltic hyaloclastite breccia, including pillow-fragment breccia, and medium bedded to laminated hyaloclastite sandstone; may locally pass laterally into pillowed basalt flows Minor Intrusions LATE TRIASSIC TO EARLY JURASSIC VOLCANICLASTIC-SEDIMENTARY UNIT 02 S Sinemurian; P Pliensbachian U-Pb zircon date (Ma, 2 sigma error; Ross et al., 1996; Palfy et al., 2000) 52 Upper Triassic (Rhaetian) to possibly Lower Jurassic (Hettangian) ls Mil eek Cr 01 95 JI Dark grey-green, variably amygdaloidal, basaltic to andesitic volcaniclastic breccias and minor flows; generally aphanitic lJLvf 27 Kenny Point Sorenson Point 42 35 35 25 36 33 03 63 42 02 aas 27 40 38 lJLpx Jurassic: U-Pb zircon date (Ma, 2 sigma error; determined by R. M. Friedman) MIDDLE JURASSIC (ca. 174.7 to 166.2 Ma) ISLAND PLUTONIC SUITE ukw Co lon y eek Cr 03 04 us Wa 27 28 166.9 (±0.5) Zr INTRUSIVE ROCKS Small outcrop of plagioclase-megacrystic basaltic to andesitic flows of unit lJLx 37 04 92 R upe r t 65 45 24 5 C Carnian; N Norian; R Rhaetian Hornblende hornfels facies: hornblende+plagioclase±epidote±quartz Dark grey-green, plagioclase-megacrystic (0.8-2cm), variably amygdaloidal basaltic to andesitic flows; locally intercalated with aphanitic and plagioclasephyric flows; texturally similar to plagioclase-megacrystic Karmutsen basalt in units uTruKf/uTruKpx 25 35 43 96 uTrlKp Medium grey, rhyolitic to dacitic flows, flow domes and/or pyroclastic rocks, including flow and pyroclastic breccias, welded to non-welded crystal-lithic lapilli tuff and rare airfall tuff; aphanitic to feldspar-phyric; locally may include thin sedimentary deposits, high-silica andesite and minor basaltic flows lJLf Late Triassic: (no label indicates age indeterminate; combined codes indicate age/zone range) Lower Karmutsen Formation: Pillow Member 06 Stewart Point 97 uTrmKh Dark grey-green, basaltic to andesitic flows with minor intercalated volcaniclastic and sedimentary lithotypes similar to unit TrJBvs; locally includes minor pillow lava/breccia; may include minor rhyolitic flows and pyroclastic rocks 35 06 uTruKls Middle Karmutsen Formation: Hyaloclastite Member Similar lithologies to those found south of the Holberg Fault; coarser sedimentary and volcaniclastic deposits appear to be less common and Sutton limestone equivalent has not been observed 18 10 Dark grey-green volcaniclastic and sedimentary rocks including basaltic to andesitic, plagioclase-clinopyroxene and plagioclase-hornblende-phyric lapilli tuff and tuff breccia, volcanic breccia, wacke and minor siltstone and mudstone; locally includes basaltic to andesitic flows LE MARE LAKE VOLCANIC UNIT 08 10 28 e early; m middle; l late 168.5 (±0.6) Zr Lower Jurassic (Hettangian to Upper Sinemurian) Misty Lake 21 Apple Bay 70 T Late Triassic; J Jurassic; K Cretaceous Thin (0.5-5m) beds and lenses of inter-volcanic limestone of unit uTruKls BONANZA GROUP - SOUTH OF HOLBERG FAULT 44 k ee Cr Washlawlis 33 Lady Ellen Point GSC Radiolarian locality (fossil age code below; identification by F. Cordey) A Aalenian Pale to medium grey, micritic to rarely bioclastic or oolitic limestone intercalated with basalt near the top of the flow succession PARSON BAY FORMATION uTrP GSC Conodont locality (fossil age code below; identification by M. J. Orchard) Fossil age designation Plagioclase-megacrystic (<2cm) pillowed basalt flows Upper Triassic (Carnian to Rhaetian) Dickenson Point er 55 26 07 50 iv 34 17 71 Medium grey to grey-green, aphanitic to feldspar-phyric, rhyolitic to dacitic flows, flow domes and/or pyroclastic rocks including flow and pyroclastic breccia, welded to non-welded crystal-lithic lapilli tuff with carbonized wood fragments; may locally include thin interbedded volcanic breccia and wacke, and minor basaltic to andesitic flows Dark grey to grey-green, medium bedded to thinly laminated, siliceous siltstone, mudstone and feldspathic lithic wacke; locally contains massive beds of basaltic to andesitic volcaniclastic breccia and thin, rhyolitic tuff beds TrJN 09 87 Stephens 20 Pulteney Point 55 75 10 Cr e k Cr ee Nuknimish 11 k re e 28 30 60 35 28 43 h al i s W ak 08 R 35 20 ek Cre 44 36 55 J uTruKpx NAHWITTI RIVER SILTSTONE-WACKE 40 34 30 Mainly dark grey-green to medium grey, basaltic to andesitic flows and volcaniclastic rocks including plagioclase-hornblende-phyric andesite, plagioclase-clinopyroxene-phyric basalt-andesite with sparse hornblende megacrysts (~1cm), tuff-breccia, lapilli tuff and reworked equivalents; minor sedimentary rocks including volcanic breccia, wacke, siltstone, mudstone and shale; locally may include minor rhyolitic flows and tuffs GSC Macrofossil locality (fossil age code below) Conodont locality (fossil age code below; identification by M. J. Orchard) TeN Dark grey-green, closely packed, pillowed basalt flows; aphanitic and variably amygdaloidal uTruKp Upper Triassic (Norian) to Lower Jurassic (Sinemurian or younger) Graeme Point 5610000N 5610000N 31 24 35 gh 85 er 24 70 Single Tree Point uas h 50 64 eo C Riv TC Small outcrop of plagioclase-megacrystic (1-2cm) basalt flow; commonly amygdaloidal and locally exhibiting trachytoid texture; intercalated with aphanitic or plagioclase-phyric basalt near the top of the succession 12 K S uq Blue e uTruKf 33 37 ek Cre Q u a ts 19 38 39 74 66 lmJHvs Macrofossil locality (fossil age code below; identification by E. T. Tozer) TlC(W) 36 40 11 Fossils Dark grey-green, aphanitic to plagioclase-phyric basalt flows, commonly amygdaloidal and locally exhibiting laminar flow features (vesicle trains) and pipe vesicles; may include minor pillow lava and hyaloclastite Poorly exposed, undivided basaltic to rhyolitic flows, volcaniclastic and sedimentary rocks east of Rupert Inlet mJHm Lineation, inclined (slickenfibres on steeply dipping fault) KARMUTSEN FORMATION 44 26 Axial plane of minor fold, inclined 17 TIN Upper Triassic (Carnian; possibly Middle Triassic (Ladinian) at the base) HOLBERG VOLCANIC UNIT 16 Axis of minor fold, inclined 17 Lineation, horizontal (slickenfibres on steeply dipping fault) Medium to pale grey, thinly bedded to massive micritic limestone and locally bioclastic limestone; minor silica replacement and chert nodules; rare laminated interbeds, oolitic layers and algal structures; locally fossiliferous uTrQ Greenish to brownish grey, thinly bedded to massive sandstone, siltstone, mudstone, pebble conglomerate and minor coal; locally fossiliferous lmJH 27 QUATSINO FORMATION UPPER TRIASSIC TO MIDDLE JURASSIC BONANZA GROUP - NORTH OF HOLBERG FAULT Lower (?Hettangian) to Middle (Bajocian) Jurassic 17 Creek D Creek Creek Booth 15 Boyden ese h -w 48 34 Wa 30 76 25 Dike, inclined, vertical 64 Upper Karmutsen Formation: Flow Member 20 Volcanic flow lamination, inclined 30 UPPER TRIASSIC VANCOUVER GROUP Upper Triassic (Carnian to Lower Norian) 69 86 45 Bedding, inclined 14 LONGARM FORMATION EQUIVALENTS lKL Thomas Point 17 Structure 30 Dark grey to grey-green, aphanitic to plagioclase-clinopyroxene-phyric tuff-breccia and lapilli tuff interbedded with thinly bedded to laminated impure limestone, siltstone, wacke and debris-flow deposits with volcanic and sedimentary clasts including poorly consolidated limestone; minor basaltic flows uTrPvs Lower conglomerate unit: massive conglomerate with minor lenses of coarse-grained lithic wacke lKCcg 19 Eagle Island 45 31 Outcrop too small to show at map scale Tertiary dike, inclined, vertical, attitude unknown Upper Valanginian to Barremian Shell Island 17 28 Round Island Deer Island Cattle Islands Line of vertical cross-section Outcrop examined Small outcrop of clinopyroxene-megacrystic basalt flow Upper sandstone unit: trough cross-laminated lithic wacke intercalated with siltstone, minor pebble conglomerate and rare coal lKCsn 5620000N ulq Ts at e C Eutaxitic foliation/welding, inclined LOWER CRETACEOUS 21 30 Unconformity, approximate 64 ?Albian River Steeply dipping fault, inferred Dark grey-green to reddish grey, coarsely plagioclase-clinopyroxene-phyric and clinopyroxene megacrystic(<1.5cm) basalt flow and flow breccia uTrPfmc COAL HARBOUR GROUP 7 26 21 Steeply dipping fault, approximate A 41 Creek Jenkinson 22 Charlie Islands 40 Steeply dipping fault, defined Dark grey-green, aphanitic to plagioclase-phyric basaltic to andesitic volcaniclastic breccia and flows Dark grey, calcareous to non-calcareous siltstone and impure limestone interbedded with subordinate wacke and minor pebble conglomerate (exposure restricted to the north shore of Quatsino Sound) uKs 26 16 Geological contact, inferred Unconformity, inferred SHALE UNIT Dillon Point 33 uTrPvfmc Dark grey-green, basaltic tuff-breccia, crystal-lithic lapilli tuff and lesser flows; coarsely clinopyroxene-plagioclase-phyric uTrPvfm Cenomanian to ?Turonian 22 uTrPfvmc Dark grey-green to maroon, coarsely clinopyroxene-plagioclase-phyric and clinopyroxene-megacrystic basaltic flows and lesser volcaniclastic breccia and crystal-lithic lapilli tuff; minor tuffaceous wacke and siltstone 24 23 Geological contact, approximate BLUMBERG FORMATION Masterman Islands Songhees Grey to greenish grey and brown, medium to coarse-grained, arkosic to lithic wacke, pebble to cobble conglomerate, siltstone and minor coal; locally fossiliferous Geological contact, defined Medium grey to black, thinly laminated to medium bedded, impure limestone, calcareous to non-calcareous mudstone, siltstone and shale intercalated with variable proportions of greygreen lithic feldspathic/tuffaceous wacke, minor crystal-lithic tuff and reworked equivalents, volcaniclastic breccia and debris-flow deposits, and rare vitric tuff, pebbly sandstone and conglomerate; shale locally yields abundant thin-shelled bivalves (Halobia sp., Monotis sp.); limestone locally contains rare algal structures; may include coralline limestone near the top of the succession equivalent in part to Sutton limestone in the Cowichan Lake area, southern Vancouver Island uTrP Cenomanian or Lower Turonian to ?Santonian Lake 40 Dark to pale grey, basalt to rhyolite flows, flow domes and volcanic breccia; aphanitic to porphyritic; minor interbedded sedimentary rocks including volcanic conglomerate, sandstone, siltstone, and debris-flow deposits QUEEN CHARLOTTE GROUP EQUIVALENTS (IN PART) 640000E 34 PARSON BAY FORMATION 37 Islands 25 24 ALERT BAY VOLCANIC UNIT uKN Duval Point Duval Island s So nghe e Upper Triassic (Carnian to Rhaetian) UPPER CRETACEOUS NANAIMO GROUP EQUIVALENTS (IN PART) Campanian to ?Maastrichtian 35 26 Neogene TAv 34 MAP SYMBOLS BONANZA GROUP - SOUTH OF HOLBERG FAULT (Cont'd) Peninsula kilometres 33 Mier Point Olympic 200 LAYERED ROCKS (Cont'd) TERTIARY Victoria 29 4 Scale 1:50 000 Vancouver Port Alberni GEOCHRONOLOGY by R.M. FRIEDMAN (The University of British Columbia) D.A. ARCHIBALD (Queen's University) kilometres Columbia Vancouver Island 25 Doyle Creek 2 British 24 Island 27 0 Campbell River 23 Island Quatsino - Port McNeill Area (92L/11 & parts of 92L/05, 12 & 13) GEOLOGY by G.T. NIXON, J.L. HAMMACK, V.M. KOYANAGI, G.J. PAYIE, A. J. ORR (BC Geological Survey) J.W. HAGGART (Geological Survey of Canada) Grid North 37 92 uTruKf uTruKf uTruKf Acknowledgments We sincerely appreciate the warm hospitality shown to us by the residents of northern Vancouver Island. We thank Margaret Hanuse and Dave Ross for accommodations in Port McNeill and Holberg, respectively. John Fleming, BHP-Utah Mines Ltd., kindly granted access to maps, drill logs and core from the Island Copper Mine and other properties. Western Forest Products Inc. provided maps and digital files of logging roads in the area. Critical reviews by L. J. Diakow, N. W. D. Massey, J. L. Nelson and P. Schiarizza greatly improved the final cartographic product. Sadly, one of our co-authors, Dr. E. T. Tozer of the Geological Survey of Canada, passed away recently; his contributions to invertebrate palaeontology will be sorely missed. uTrP A P CIPW (wt %) normative compositions projected in QAP: Q (qz), A (Or) and P (Ab+An) taking Fe2O3 as 0.15FeOt (total Fe as FeO). Grey diamonds fall in the extension of the Wanokana Creek Pluton in the Holberg-Winter Harbour area (Geoscience Map 2011-1). Nomenclature of plutonic rocks on the map is based on the IUGS modal QAP mineralogical classification. Any discrepancy between modal and CIPW rock nomenclature is due in part to the projection scheme. The CIPW projection of least altered plutonic rocks (n=96; grey/black dots) yields an overabundance of Or in the norm due to the presence of K-bearing mafic hydrous minerals (biotite, hornblende) relative to the mesonorm (red crosses); the latter produces a bias towards tonalite in the granitoid rocks (not a common rock type) whereas the CIPW projection shows bias towards quartz monzodiorite (much less common than quartz diorite). Data Compilation G. T. Nixon, K. A. Johnston, M. C. Kelman and R. D. M. Rayner Recommended Citation Nixon, G. T., Hammack, J.L., Koyanagi, V.M., Payie, G.J., Orr, A.J., Haggart, J.W., Orchard, M.J., Tozer, E.T., Friedman, R. M., Archibald, D. A., Palfy, J., and Cordey, F. (2011): Geology, geochronology, lithogeochemistry and metamorphism of the Quatsino-Port McNeill area, northern Vancouver Island; BC Ministry of Energy and Mines, Geoscience Map 2011-2, 1:50 000 scale.