2.3 Ma. ± (?)) 0.6 Ma): Capoose batholith; pink, zone) and the small delicate 20% subhedral plagioclase (2-7mm in (2-7mm plagioclase subhedral 20% ± too narrow to represent at the current the at represent to narrow too monzonite pluton, separate from the felsic tuff interbeds; locally contains 1 Ma): Undeformed granodiorite in the -grained equigranular texture, hornblende ± combined hornblende and lesser biotite nish garnet phenocrysts. Exposed near the Kanense 20% augite phenocrysts (2-6mm) and 0.6 Ma): 0.6 ± 1.5 mm) broken quartz grains are diagnostic but 3%); locally contains xenoliths of augite porphyry (continued) too narrow to represent at the current map scale. 10 EARLY TOARCIAN AALENIAN TO TOARCIAN EARLY INTRUSIVE ROCKS ( Recessive unit mapped intermittantly along the eastern flank of (continued) 20%) over biotite ( . Off white, aphanitic sucrosic texture, locally flow laminated, up to 3% Bositra. . Solitary exposure along the Red Road, just outside of the map area in 8 Quartz dioriteplugs: grey-green, medium ( dominant Rhyolite sills (ca. 70 Ma): Off- map scale. Limestone: white and grey; recrystallized; fossiliferous; 3 metre thick exposure road. Tine van the along Sandstone, siltstone, mudstone and subordinate granule-pebble conglomerate as recessive intervals between Unit 3a flows: green, angular feldspar and volcanic lithic clasts are the major detrital components, the clasts are generally off white and composed of aphanitic rhyolite; rare conglomerate composed of clasts up to 30 cm that are derived locally from Units 2c and 3a. Abundant bivalves and rare ammonites. Mainly lapilli tuff and lesser breccia dominated by fragments of 3a. Unit Lapilli tuff, ash tuff and crystal-ash tuff, rare accretionary lapilli tuff: maroon and light green; minute (generally scarce (1-2%); faint to distinctly layered fine grained interbeds, local internal grading; similar bedded tuffs recur upsection in Unit 5 in the northern Fawnie Range. Dacitic porphyry maroon, flows: local faint laminae. flow Rhyolitic lapilli tuff and rare accretionary lapilli tuff: light pink or off white, characterized by up to 5% angular quartz, and potassium-bearing lithic fragments. Exposed best in the vicinity of Kuyakuz Mountain. Sandstone and siltstone composed mainly of angular plagioclase and subordinate quartz grains: gradational above and laterally with tuffs of 2a. Unit Waterlain mafic ash and lapilli tuff: well bedded, dominated by finely vesicular and amygdaloidal basaltic lapilli. Locallyunderlies Kuyakuz at 2as units 2a and Mountain. Rhyolite ash-flow tuff, lapilli tuff: off-white, grey and pink, to indurated, weakly well moderately welded, diagnostic subrounded to elliptical resorbed quartz phenocrysts up to 3 mm (1-7%), lithic pyroclasts include flow-laminated rhyolite, porphyritic andesite and rare granodiorite. Scarce rhyolitic lava flows with white or black flow laminae. Subaerial volcanic facies confined mainly to the central and southern Fawnie Range. May be comagmatic with Unit 2a. Quartz-rich sandstones and siltstones minor cobble conglomerate, lesser interlayered lapilli tuff and ash tuff: maroon or grey green, well bedded, graded and cross laminated; quartz grains and quartz-bearing clasts are apparently derived from Unit 2c Feldspathic siltstones, sandstones and volcanic-lithic pebble conglomerate: dominated by plagioclase grains and angular off-white aphanitic rhyolitic fragments, minor black mudstone and lesser reworked Toarcian ammonites. Difficult to distinguish from Unit 3as with certainty. Mapped mainly along the west side of the southern Nechako Range and interpreted as a facies. marine shallow Black mudstone, locally with discrete white ash-tuff laminae and minor disseminated pyrite; limy siltstone containing scarce grey and impure brownish limestone layersandconcretions, minor feldspathicsandstone. siltstoneand Locally contains Toarcian ammonites ( bivalve, the Nechako Range and interpreted as a relatively deep marine facies. Siltstone and mudstone: black and tan brown, laminated, contains the bivalve, Halobia mapsheet 93F/10. Gabbroic dikes or small plugs: grey to dark green, fine to medium grained, plagioclase, clinopyroxene and olivine phyric. Biotite-feldspar porphyry dikes or small plugs: most are too to represent at narrow the current map scale. Phenocrysts include diameter) and up to 7% vitreous and chloritized biotite in a light grey groundmass. They cut rhyolitic ash-flow tuffs 9b. of Unit Granodiorite and granite(ca. 51.8 stocks central Nechako is off white, coarse grained and equigranular up to 25% with combined, fresh biotite and lesser hornblende. Granite south of Tatelkuz Lake is distinguished by its relative absence of mafic minerals, which consist of between traceand vitreous 3% biotite. These plutonscutcountry penetratively cleaved rocks in the Nechako Range. Quartz-feldspar porphyry plugs and dikes: light grey, pink and cream colored, quar NAGLICO FORMATION FORMATION NAGLICO FORMATION ENTIAKO Bp 3al 3at 3as 2as 2cs HAZELTON GROUP I J F E B A H D C G 3c 2a 2c 2e 3b 2d 2b 6 LOWER AND MIDDLE JURASSIC UPPER TRIASSIC TERTIARY - PROBABLY EOCENE POSSIBLY LATE CRETACEOUS LATE CRETACEOUS LATE JURASSICTO EARLYCRETACEOUS JURASSIC MIDDLE Kilometres LEGEND 4 Scale 1:100 000 3 mm in 3 mm NTS 93F/ 2, 3, 6, & 7 & 6, NTS 93F/ 2, 3, GEOLOGICAL SURVEY BRANCH SURVEY GEOLOGICAL 2 3 Ma): grey-green or ± GEOSCIENCE MAP 1997-2 4 Ma), lapilli tuff containing ) By L.J. Diakow and V.M. Levson V.M. By L.J. Diakow and ± ying sands and gravels; common glacially-derived debris flow debris glacially-derived 1.8 and 70.3 ± 0 overl 1.7 Ma): mauve, cream, light green or See 1:50 000 scalefor maps File Open ± green, typically porphyritic 20-30% with : y cogenetic with nearby Late Cretaceous and/or eathering, sparse plagioclase, quartz and 2Ma); tentatively correlativein stratigraphy ± CENTRAL BRITISH COLUMBIA Note ) 1 to 49.9 ± BAJOCIAN EARLY CALLOVIAN TO TO OXFORDIAN CALLOVIAN EARLY ( ( BEDROCK AND SURFICIAL GEOLOGY dense, unsorted to very poorly sorted; matrix sandy to silty dominantly basal tills; some OF THE SOUTHERN NECHAKO PLATEAU, VOLCANIC AND SEDIMENTARYROCKS Resedimented glacial debris: sandydiamicton, gravel and sand;dominantly glacial debris flow deposits with interbedded Fluvial/glaciofluvial sand and gravel, lacustrine/glaciolacustrine sediments, and organic deposits: geochemical signature generally regional and difficult to trace source; includes floodplain, terrace, delta, alluvial fan, outwash, esker, kame, peat bog, swamp and marsh deposits. internal subdivisionsof thisunit. deposits; geochemical signature generally local and traceable; diamicton massive or crudely stratified, clay; clasts up to boulder size; flutings and crag-and-tail features common; deposits thin (<1 m thick) on steep upper slopes and thicker slopes. on lower along meltwater channels and within areas of hummocky topography. Thin till and colluvial deposits: unsorted or very poorly sorted diamicton with abundant angular clasts of local bedrock; occurs mainly as veneers less than 1 metre thick over bedrock in upland areas; locally includes thicker colluvial fan and talus deposits at the base of steep slopes. Olivine basalt lava flows: weather brown, crudely layered and columnar jointed, massive to vesicular, typically aphanitic or olivine phyric. Rare friable black mudstone and sandstone; may contain plant debris. Basaltic andesite and andesitic lava flows: weather buff grey-green, fresh surface lustrous black, aphanitic to sparsely porphyritic, contain plagioclase and microscopic augite and hypersthene, rarely amygdaloidal with scarce amygdules infilled with opalescent silica; minor hematized interflow breccia. Rare andisitic flow member characterized by plagioclase megacrysts up to 1 cm. Andesitic lava flows and volcaniclastic rocks: dark green to maroon, coarsely porphyritic flows and tuff breccia; minor interbedded ash-tuff; rare block tuff and laminated black siltstone on the summit of Mount Davidson. Rhyolitic ash-flow tuff:green, grey unweldedwelded,fragments to weakly crystal (25-30%) characterized by resorbed and prismatic quartz (5-15%, avg. 2mm diameter), plagioclase, potassium feldspar (2-7%) and rare sericitized biotite, lithic fragments (5-20%)typically of lapillisizeconsist of cognatequartzrhyolite, phyric flow banded and aphanitic rhyolite, and porphyritic andesite; the groundmass when stained indicates weak to moderate potassium feldspar; minor block-lapilli tuff; rare bedded sections of quartz-bearing sandstone derived from the underlying ashflows. Dacitic lava flows: light grey, flaggy w phenocrysts. biotite Andesitic lava flows: maroon and dark slender plagioclase up to 5 millimetres and sparse pyroxene phenocrysts, minor amygdaloidal flows with quartz, epidote and chlorite amygdules; Subunit 9di is a local andesitic flow member that contains plagioclase laths up to 1.2 cm, resembling Unit 10a. Rhyolitic lava flows (ca. 49.2 grey, aphanitic to sparsely porphyritic, flow laminated textures predominate but are commonly overprinted by solitary andcoalescing spherulites,porphyritic flows contain plagioclase, up to 5% quartz and traces of rare sericitized biotite; autobrecciated flows. Basal conglomerate, dominated by hornblende-biotite quartz monzonite cobbles and boulders; occurs in a creek exposure at the Wolf mineral prospect, east of Entiako Lake. Fine ash to lapilli tuff dominated by rhyolitic fragments, locally up to 15% quartz phenocrysts; well bedded, minor lacustrine tuffaceous sandstone and siltstone interbeds may contain plant fragments. Andesitic lapilli tuff and tuff breccia (ca. 64.5 purple, monolithic hornblende phyric fragments; white aphanitic rhyolite lava flows (ca. 71.9+2.0/-0.2 Ma) that are possibl garnet-bearing rhyolite dikes and sills in the immediate vicinity of the Capoose prospect (MINFILE 040). Black mudstone and sandstone with thin carbonaceous layers containing Albian the along only found exposures sporadic conglomerate: minor palynomorphs, shoreline at the mouth of the Entiako River. 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R (Ma)] age in m.y. U-Pb (U); K-Ar (K),
Tsacha N S Lake ty-scale Application of Lake Sediment Geochemistry in the in Geochemistry Sediment Lake ty-scale of Application 93 F
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...... N Bella 237-246. L/16; F/2,3,7; (93C/1,8,9,10; Nechako and Fraser Plateaus, Central British Columbia M/1); Geophysical Studies,Editors, Newell,L.J., Diakow, and J.M. and Investment Memoir 324, 59 pages. the Capoose Base and Precious Metal Porp Columbia, British of University The thesis, M.Sc. unpublished Columbia; British Central 334 p Search for Buried Mineral DepositsBritish Area, Plateau Nechako in the Southern Columbia (93C,E,F,K,L); Central British ColumbiaF); and C 93B, (Partsof Summary of Geological, Geochemical Editors, Diakow, L.J., Nechako Ranges, Southern Nechako Plateau, Central British Columbia (93F/2,3,6,7); in (93F/2,3,6,7); Columbia British Nechako Ranges, Southern Nechako Plateau, Central Interior Plateau Geoscience Project: Su Geophysical Studies,Editors, Newell,L.J., Diakow, and J.M. and Investment Geochemical and Geophysical Studies, Newe Ministry of Employment and Investment and Employment of Ministry Mt. Swannell F/3 F/6 F/7 Cow L. Cow Houston Uranium-lead geochronology by Richard M. Friedman and potassium-argon determinations by determinations potassium-argon and Friedman M. Richard by geochronology Uranium-lead Cartography mainly by John Armitage. John by mainly Cartography subscripts (separate analyzed):b-biotite, h-hornblende, t-titanite, wr- whole rock, z-zircon Ice flow direction Fluting Till geochemistrysite site geochemistry sediment Lake occurrence MINFILE Symbols Major all weather logging r Mapping and Analyses Surficial Mappi NTS 93F/3: V.M. LevsonGiles T.R. and NTS 93F/2 and 7: V.M. Levson, T.R. Bedrock Mapping NTS 93F/2, 7: L.J. Diakow, T.A. Richards,Webster I.C.L. and WhittlesJ.A. Fossil Identifications: Age Determinations: Joe Harakal at The University of British Columbia;Reynoldsat Peter by dating argon-argon University. Dalhousie References Recommended Citation: 1997-2, 1:100 Reviewed byW.J. McMillan. Stratigraphic contact (approximate) contact Stratigraphic (approximate) contact Intrusive (assumed) High angle fault Thrust fault (assumed) layering Bedding, flow Foliation Fossil locality[macrofossil (F),palynology (Fp); GSC locationnumber] Age determination site [method Ar-Ar (A), NTSPerry 93F/6: A. L.J.and Diakow, Whittles J.A. K. Green, NTS 93F/3: L.J. Diakow, I.C.L. Webster,Riddell J. Jenningsand H. Diakow, L.J. and Levson, V.M. (1997): Bedrock Plateau, Central British Columbia,Map Geoscience MinistryInvestment, and Employment of Levson, V.M. and Giles,the in T.R.Studies (1997):Geochemistry QuaternaryTill and Geology Tipper, H.W. (1963): Nechako River Map-area, Br Andrew, K.P.E. (1988): Geology and Genesis of the Wolf Precious Metal Epithermal Prospect and Prospect Epithermal Metal Andrew, K.P.E. (1988): GeologyPrecious and Genesis of the Wolf Cook, S.J. (1997): Regional and Proper Lane, R. A. and Schroeter, T.G.(1997): A Review of Diakow, L.J., Webster, I.C.L., Richards, T.A. and Terry P. Poulton, Howard W. Tipper and Jim
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