ouver Island, British northern VancouverIsland, on on the use ofthe use decay on geochemical data in igneous geochemical data area, Vancouver Island, British Geological Fieldwork 2005, Geological Fieldwork ±calcite ±epidote±quartz±calcite pkish area, Vancouver Island; ed Wrangellia oceanic plateau; Geosphere, pumpellyite±prehnite+chlorite+albite Volume 136, pages 169-206. lite+chlorite+albite±epidote±quartz nblende+plagioclase±epidote±quartz pkish,West Half;of Geological Survey Canada, approximation to the approximation modal QAPF classification of the the Island Plutonic Suite,the Island rpretation ofwhole-rock A. and Johnston, K. A. (2006): Preliminary geology of geology Preliminary A.K. (2006): and Johnston, A. ouver Island, BC: in anetary Science Letters, Volume 6, pages 359-362. Letters, Volume Science 6, anetary t Bay - Cape Scott, British Columbia; Geological SurveyColumbia; Geological Scott, British - Cape t Bay ., Israel, S. G. T. (2010): and Nixon, The architecture of : Geology and mineral deposits of Alert Bay - Cape Scottof - Bay mineral deposits Alert and Geology : Nimpkish, East Half; Geological Survey of Canada, pkish Lake quadrangle, Vanc (K) Kerri; (D) Dawsoni; (M) Magnus; (M) (D) Dawsoni; (K) Kerri; (C) Cordilleranus (Cb) Columbianus; (R) Rutherfordi; (P) Primitius (N) Nodosus; C Carnian; N Norian C Carnian; Fossil age designation age Fossil on on geochronology: conventigeochronology: on (no label indicates age indeterminate; (no label indicates range) age/zone indicate combined codes l u lower; upper e early; m middle; e early; l late T Late Triassic;T J Jurassic Late Geological Survey of Canada, Paper 74-8, 77 pages. morial University of 81 pages. Newfoundland, G. T. Nixon G. T. Summary Report 1931, Part A, pages 22-35. A,1931, Part pages Report Summary Data Compilation ta Toolkit (GCDkit); Journal of Volume Petrology, 47, pages 1255-1259 ry Report 1929, Part A, pages 94-107. A,1929, Part pages Report ry oleum Resources, Paper 2006-1, pages 135-152. Paper 2006-1, oleum Resources, neral deposits of Zeballos-Nimpkish Digital Cartography lcanic stratigraphy oflcanic stratigraphy the accret mineral deposits of Quatsino-Nim Selected References Selected Recommended Citation MAP SYMBOLS buch für Mineralogie Abhandlungen, Late Triassic: Late Zone: Ammonite Conodont Zone: Conodont Fossils Outcrop examinedOutcrop too small to Outcrop show at map scale Structure Geochronology 2 sigma date U-Pb (Ma, error; determinedzircon by Mortensen) K. Friedman and J. M. R. Metamorphism hor facies: Hornblende hornfels mainly: facies Prehnite-pumpellyite (±sulphide) skarnCalc-silicate (massive deposit sulphide) Manto-type (092L 036) locality MINFILE Topography Road (gravel) Road (paved) Rail line Rail line (abandoned) Upper greenschist facies: actino facies: Upper greenschist Mineralization GSC Macrofossil locality (age code as below) locality Macrofossil GSC Geological contact, defined contact, Geological approximate contact, Geological inferred contact, Geological defined fault, dipping Steeply approximate dipping fault, Steeply inferred fault, dipping Steeply mapping Limit of verticalLine of cross-section vertical horizontal, inclined, Bedding, inclined lamination, Volcanic flow vertical inclined, flow lamination, Plutonic vertical Dike, inclined, dike,verticalTertiary Axis of minor inclined fold, Axial plane of minor inclined fold, Recumbent fold showing dip of axial plane dipping fault) inclined (slickenfibres on steeply Lineation, dipping fault) (slickenfibres on steeply horizontal Lineation, of syncline Axial trace by identification (age code as below; locality Macrofossil McRoberts) A. C. by identification (age code as below; locality Conodont Orchard) J. M. Lake land (swamp)Flooded riverStream or (100m)Contour (m) height Spot J. P. Larocque and R. D. M. Rayner by G. T. Nixon, M. C. Kelman, K. A. Johnston, Kelman, G. T. Nixon, M. C. 16 TIN TIC TlC(lP) 36 14 Nixon, G. T., Kelman, M.C., Larocque, J. P., Stevenson, D.B., Stokes, L.A., Pals, L.A., D.B., Stokes, T.,Stevenson, Larocque, J. P., Kelman,Nixon, G. M.C., Friedman,R. Styan, M., Mortensen, J., Johnston, K.A., J.K., Orchard,A., M. J. and McRoberts, (2011): Geology, geochronology, lithogeochemistry C.A. and metamorphism of the Nimpkish-Telegraph area, Cove northern Vancouver Island; BC Ministry of EnergyMines, Geoscience Map 2011-5, 1:50 000 scale. and 27 17 10 GEOCHRONOLOGY 177.2 (±0.2) Zr 177.2 (±0.2) AC 30 35 64 petrology: introducing petrology: Geochemical Da Janousek, V., Farrow, C. M. and Erban, V. (2006): Inte and Erban, V. C. M. Janousek,Farrow, V., Steiger, R. H. and Jäger, E. (1977): SubcommissiJäger, E. (1977): H. and Steiger, R. Greene, A. R., Scoates, J. S., Weis, D., Katvala, E. C oceanic plateaus revealed by the vo Volume 6, pages 47-73. Earth and Pl geo- and cosmochronology; constants in Stokes, L. A. (2006): and ofGeochemistry petrography Streckeisen, A. and LeMaitre, R. W. (1979): A chemical igneous rocks; Neues Jahr British Columbia; unpublished B.Sc. thesis, Me BC Ministry of Energy, Mines and Petr Mines and of BC Energy, Ministry Hoadley, J.W.Hoadley, and mi (1953): Geology G. Nixon, T., Kelman, M. C., Stevenson, D., Stokes, L. the Nimpkish map area (NTS 092L/07), northern Vanc Gunning, H.C. (1930): and Geology ofSummaGeological Survey Canada, Gunning, H.C. report on (1932): Preliminary the Nim Columbia; Geological Survey of Canada, D. (1974) and Carlisle, K. E.E., Northcote, Muller, J. map area, Vancouver Island, British Columbia; Gunning, H.C. (1938a): Preliminary geological map, Gunning, H.C. (1938a): Preliminary Paper 38-2. geological map, Nim Preliminary Gunning, H.C. (1938b): Paper 38-3. Muller, J. E. and Roddick, J. A. (1983): Aler Geology, 1:250 000. ofMap 1552A, scale Canada, Columbia; Geological Survey of Canada, Memoir 272, 82 pages. (The University of British Columbia) of British University (The R.M. FRIEDMAN and J.K. MORTENSEN J.K. and FRIEDMAN R.M. H dote, umpellyite. P Plutonic Rocks Major Intrusions > 63 Dacite- Rhyolite uTruKf uTrQ teration, commonly involving chlorite, epi chlorite, involving commonly teration, _ medium grey, micritic to rarely micritic medium to grey, >57 < 63 >57 < Andesite Beaver ter-volcanic uTruKls) limestone (unit alated with basalt near the top of the top near the basalt with alated Cove Pluton 24 _ (qmd), granodiorite (gd), tonalite (tn), tonalite (gd), (qmd), granodiorite by hornblende±biotite-bearing diorite (di), diorite hornblende±biotite-bearing >53 < 57 >53 < kilometres Basaltic Andesite ubvolcanic intrusion ubvolcanic intrusion or diabase; olivine-clinopyroxene±plagioclase minerals, and less commonly actinolite, potassium feldspar and p feldspar actinolite, potassium and less commonly minerals, GEOLOGY Bonanza Scale 1:50 000 Scale Lake Fault _ < 53 uTruKf BC Geological Survey Basalt clature is due in is clature 40 39 40 gdule fillings, or pervasive fine-grained al fine-grained pervasive or gdule fillings, on than quartz diorite). quartz on than omenclature of plutonic omenclature of Theimer WHOLE-ROCK GEOCHEMISTRY LEGEND GEOSCIENCE MAP 2011-5 0 Creek Pluton Small outcrop of dark plagioclase-megacrystic (1-2cm) basalt grey-green, texture; flow; commonly amygdaloidal exhibiting trachytoid and locally near aphanitic top basalt or plagioclase-phyric with of intercalated the the flow succession Thin (~5-8m) beds and lenses of pale to limestone interc or oolitic bioclastic flow succession beds and lenses of in Thin (0.5-5m) and packed, aphanitic flows; pillowed basalt closely Dark grey-green, amygdaloidal variably Small lens of to mediumthin dark grey, bedded, calcareous mudstone detritus hyaloclastite fine-grained contain may and limestone; NTS 092L/07 & part of 92L/10 nce of Or in the norm in the due to nce of Or and K.A. JOHNSTON (BC Geological Survey) JOHNSTON Geological (BC and K.A. ces a bias in tonalite towards LAYERED ROCKS (Cont'd) INTRUSIVE ROCKS G.T. NIXON, M.C. KELMAN, J.P. LAROCQUE, J.P. KELMAN, M.C. NIXON, G.T. < 53 ed using the decay constants decay ed using the Picrite Dark grey-green, aphanitic to plagioclase-phyric and minor plagioclase-megacrystic plagioclase-phyric to aphanitic Dark grey-green, flow features exhibiting laminar and locally commonly amygdaloidal flows, basalt (vesicle trains) and pipe vesicles; may include minor pillow lava and hyaloclastite breccia, hyaloclastite massive mediumto Dark basaltic grey-green, bedded, and including pillow-fragment breccia, medium laminated hyaloclastite bedded to flows basalt pillowed into pass laterally locally may sandstone; massive flows and localized, packed, pillowed basalt closely Dark grey-green, include inter- may aphanitic and non-amygdaloidal; typically flow lobes; inflated pillow or rare thin lenses of well-bedded hyaloclastite Karmutsen recrystallized rounded xenoliths of variably angular to Agmatite: mesostasisvolcanic in a medium-grained,granitoid set rocks phase of Dioritic Beaver Cove Pluton D.B. STEVENSON, L.A. STOKES, A. PALS, J. STYAN J. PALS, A. STOKES, L.A. STEVENSON, D.B. Notes (MgO>12 wt(MgO>12 %) Dark grey-green to pale pinkish grey, medium equigranular pale pinkish coarse-grained, to to grey, Dark grey-green includes rocksgranitoid and porphyry; monzodiorite quartz (qdi), diorite quartz (po) porphyry and plagioclase±hornblende (g) granite s Darkbasalt-andesite grey-green, volcanism Group coeval Bonanza with grey-green, of dark Small intrusion of part similar lower the lavas mineralogically in with coeval porphyry uTrPvmc/uTrPfvmc) (units Group Bonanza the uTruKls uTrmKp Acknowledgments uTrP JIag JIdi uTruKf uTrlKp uTrmKh 2 Upper Karmutsen Member Formation: Flow Member KarmutsenFormation: Hyaloclastite Middle Lower Karmutsen Formation: Pillow Member JI uTrQ SiO wt % Least altered metasomatized Alkali Severely altered* Volcanic Rocks TrJBim Batholith Nimpkish Classification ISLAND PLUTONIC SUITE PLUTONIC ISLAND Minor Intrusions * High proportions of veinlets and/or amy and/or of veinlets proportions High * zeolites and clay prehnite, sericite, albite, calcite, quartz, EARLY187.5 to 172.8 Ma) TO MIDDLE JURASSIC (ca. TO EARLYJURASSIC LATE TRIASSIC uTrPvmc All isotopic dates are calculat dates All isotopic recommended estimates and Jäger (1977); recent Steiger by would increase the constants of K decay Ar/ Ar age by ca. 1%. limit of mapping the was outside in remote areas and Geology compiled from and Roddick BC Assessment and Muller Reports (1983). We sincerely appreciate the warm hospitality shown to us by shown to Wehospitality warm the appreciate sincerely Vancouver residents Weof northern the Island. thank Margaret Forest International Hanuse for accommodation in McNeill. Port Cascadia Products Corp., Canadian Forest Corp., Products and Western kindly Ltd., Inc., Products Products Forest Forest area. in the files of logging roads provideddigital maps and Nelson L. J. W.Diakow, N. Massey, J. D. L. by reviewsCritical product. cartographic improved final the greatly Schiarizza and P. P uTrPvmc Early to Middle Jurassic Early to uTruKf Bonanza K.A. Johnston, R.M. Friedman, J.K. Mortensen, M.J. Orchard and C.A. McRoberts and C.A. Orchard M.J. Mortensen, J.K. Friedman, R.M. Johnston, K.A. Lake Pluton projection shows bias towards quartz monzodiorite (much less comm (much monzodiorite quartz shows bias towards projection G.T. Nixon, M.C. Kelman, J.P. Larocque, D.B. Stevenson, L.A. Stokes, A. Pals, J. Styan, J. Pals, A. Stokes, L.A. Stevenson, D.B. Larocque, J.P. Kelman, Nixon, M.C. G.T. A (Or) and P (Ab+An) taking Fe2O3 as 0.15FeOt (total Fe as FeO). N as FeO). Fe A (total and P (Ab+An) (Or) as 0.15FeOt taking Fe2O3 tered plutonic rocks (n=96; grey/black dots) yields an overabunda yields dots) rocks grey/black (n=96; plutonic tered by vs CIPW vs Mesonorm PALEONTOLOGY nerals (biotite, hornblende) relative to the mesonorm (red crosses); the latter produ latter mesonormthe the hornblende) relative (red crosses); to nerals (biotite, JIqdi-tn Declination North Magnetic Magnetic Kinman C. A. McROBERTS (SUNY, Cortland) (SUNY, McROBERTS A. C. Geology, Geochronology, Lithogeochemistry and Metamorphism rcalated with variable of grey- with proportions rcalated

Creek Pluton of the Nimpkish-Telegraph Cove Area, Northern Vancouver Island North Grid -shelled bivalves (Halobia sp., Monotis sp.); -shelled bivalves Monotis (Halobia sp., eccia and lapilli tuff; aphanitic to coarsely to aphanitic eccia and lapilli tuff; c to sparsely plagioclase-phyric sparsely c to Cowichan Lake area, southern VancouverCowichan Lake southern Island area, and rare vitric tuff, pebbly and sandstone pebbly and tuff, rare vitric ne±plagioclase-phyric; minor interbedded ne±plagioclase-phyric; M.J. ORCHARD (Geological Survey of Canada) Survey ORCHARD (Geological M.J. t nodules; rare laminated interbeds, oolitic rare laminated interbeds, nodules; t nor crystal-lithic tuff tuff and reworked equivalents, nor crystal-lithic medium bedded, impure limestone, calcareous to volcaniclastic breccia and dacitic to di/gb 1º 44' one and minor coal; locally fossiliferous one and minor locally coal; tion (Zone 9). Elevation in qgb qdi/ andesitic volcaniclastic breccia andesitic tn md/mg qmd/ qmg uTruKf gd Noomas /qgb, qz diorite/qz gabbro; as, diorite/qz /qgb, qz LAYERED ROCKS Base MapInformation Fault ; gd, granodiorite; tn, tonalite; aqs, granodiorite; tn, ; gd, Creek Pluton mz, monzonite; md/mg, monzodiorite/ monzonite; mz, uTrQ mz Q qm CIPW %) (wt normative (qz), Q in compositions projected QAP: modalbetween and CIPW rock discrepancy nomen Any modalclassification. mineralogical QAP IUGS based on the mapthe rocks is on scheme. The CIPW projection the to al part of least projection the presence of K-bearing mafic hydrous mi hydrous of K-bearing mafic presence the the granitoid rocks (not a common rock type) whereas the CIPWwhereas the common rocks a (not rock granitoid type) the Nimpkish IUGS g 20 minutes east, decreasing Approximate mean magnetic declination February 2011 for annually 12.3 minutesyear annually 12.3 per centre of map area: 18 degrees centre of map Base map produced from digital TRIM (Terrain 1:20 000-scale Resource Inventory Management) of Columbia Ministry database, British topographic Operations. Natural Resource North American Datum 1983 (NAD83). Universal Transverse Mercator Projec metres above mean sea level. Contour interval 100m. Classification Dark grey-green basaltic basaltic Darkvolcaniclastic br grey-green clinopyroxene-olivine±plagioclase-phyric flows and minor basaltic Dark grey-green volcaniclastic breccia and lapilli tuff; clinopyroxene-olivi coarsely to aphanitic fossiliferous locally wacke and shale, siltstone, mudstone, to volcaniclastic aphanitic breccia andesitic and lapilli tuff; Dark grey-green, plagioclase-phyric sparsely aphaniti flows; andesitic Dark grey-green rhyolitic reddish grey, to Dark grey minor reworked variably and basaltic lithic tuff; and vitric sedimentary volcaniclastic interbeds andesitic to to of basaltic Thin interbeds small(too show at mapto scale) 60 qs uTrK ag sy (uTruKf) uTrmKh? (no vertical exaggeration) Medium grey to black, thinly laminated to black, to grey thinly Medium inte and shale siltstone non-calcareous mudstone, wacke, mi feldspathic/tuffaceous green lithic volcaniclastic breccia and debris-flow deposits, thin abundant yields shale locally conglomerate; of top near the include coralline limestone may algal structures; rare contains limestone locally limestone, Sutton succession equivalent to the bioclastic massive locally bedded to micritic limestone and thinly grey, pale to Medium minorcher limestone; silica replacement and fossiliferous locally and algal structures; layers Grey to greenish grey and brown, medium to coarse-grained arkosic to lithic wacke, mediumarkosic lithic and brown, to coarse-grained to grey greenish to Grey siltst cobble conglomerate, pebble to lava flow/hyaloclastite/pillow basalt dark grey-green Undifferentiated, map area) the (outside G A 0 aqs 20 500 as -500 metres 1500 1000 uTrPfi uTrPvi uTrPvf -1000 5 uTrPvmc uTrPfvmc Campanian to ?Maastrichtian to Rhaetian) Upper Triassic (Carnian Upper Triassic (Carnian to Lower Norian) Triassic (Ladinian) at the base) Upper Triassic (Carnian; possibly Middle QUATSINO FORMATION KARMUTSEN FORMATION PARSON BAY FORMATION PARSON BAY A uKN uTrP uTrQ ag, alkali-feldspar granite; g, granite ag, alkali-feldspargranite; g, qmd/qmg, monzonite; qm, qz syenite; alkali-feldspar qs, qz syenite; qz qdi monzo-gabbro; monzodiorite/qz qz syenite; alkali-feldspar sy, syenite; di/gb, diorite/gabbro monzogabbro; uTrK BONANZA GROUP BONANZA GROUP VANCOUVER NANAIMO GROUP EQUIVALENTS (IN PART) GROUP EQUIVALENTS NANAIMO UPPER TRIASSIC UPPER CRETACEOUS

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0 N 0 0 5 6 0 5 0 8 0 0 0 0 0 0 0 N 5 5 9 0 0 0 5 5 5 7 0 N 0 N A 07 06 05 04 03 02 01 99 98 97 96 95 94 93 92 91 89 88 87 86 85 84 83 82 81 79 78 77 76 75 74 73 72 71 69 0 500 -500 metres 1500 1000 -1000