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COLUMBIA Ministry of Employment and Investment Energy and Minerals Division Geological Survey Branch BRITISH COLUMBIA Ministry of Employment and Investment Energy and Minerals Division Geological Survey Branch GEOLOGY AND MINERAL OCCURRENCES OF THE TASEKO - BRIDGE RIVER AREA By P. Schiarizzs, P.Geo., R.G. Gaba, P.Geo., J.K. Glover, P.Geo., J.I. Garver and P.J. Umhoefer Contributions by D.A. Archibald, T.P. Poulton,H.W. Tipper, F. Cordey, M.J. Orchard, J.A. Jeletzky, J.W. Haggart, J.F. Basinger, A.R. Sweet and R.M. Friedman BULLETIN 100 Canadian Catalominp,.. in Publication Data r Main entry under title: Geology and mineral Occurrences of the Taseko - Bridge River area (Bulletin ; 100) Issued by Geological Survey Branch. Includes bibliographical references: p. ISBN 0-7726-3044-5 1. Geology -British Columbia - Taseko River Region. 2. Geology, kconamic - British Columbia - Taseko River Region. 3. Mines and mineral resources - British Columbia VICTORIA - Taseko River Region. 1. Schiarizza, P. 11. British BRITISH COLUMBIA Columbia. Minisy of Employment and Investment. 111. CANADA British Columbia. Geological Survey Branch. 1V. Title. V. Series: Bulletin (British Columbia. Minisq of Employment and Invescment ) ; 1W. FEBRUARY 1997 QE187.G46 1997 557.11'31 C96-960332-0 The Taseko -Bridge River map area covers about 3200 rocks, formerly includedin the Noel Formation,that are here square kilometresof mountainous terrain centred200 kilo- assignedtotheinformalGunLakeandDowntonLakeunits. metres northof Vancouver. It lies between latitudesSO"45' These rocks are included withinthe Cayoosh assemblage,a and 5l'lS'north and longitudes 122"OO'and 123"3O'west, thick coherent succession of clastic metasedimenlary rocks and covers NTS map areas 920/2 and 920/3 and portions that conformably overlies the BridgeRiver Comp1,:x to the of map areas920/1,92J/14,92J/IS and 92J/16. Geological south of theTaseko - Bridge River area. They are :tlsocor- mapping of the area was funded by the 1985-1990 Canada related with the basal part of the Tyaughtonsu :cession basin - British Columbia Mineral Development Agreement. Its (lower Relay Mountain Group)to the north. The Jxa-Cre- main objectives were to stimulateand focus mineral explo- taceous Truax Creek conglomerate, which occurs;as a nar- ration by improvingthe geoscience databasefor the area and row fault-bounded lens spatially associated with the Gun providing a geological framework within whichto interpret Lake unit, may representa younger part of the Cayoosh as- mineral occurrences, alteration zones and geochemical semblage, correlative with the middle part of the Relay anomalies. This information contributesto an assessmentof Mountain Group. the overall mineral resource potentialof the area, thus pro- Cadwallader Terraneincludes the Upper Triassic Cad- viding guidelines for future mineral exploration and land- wallader and Tyaughton groups together with Lower to use designations. Middle Jurassic rocksof the LastCreek formation and Junc- The map area comprisespart ofthe southeastern Coast tion Creek unit.The most extensively exposed component Belt, which is underlain by a number ofdistinct Late Paleo- is the Hurley Formation of the Cadwallader Group, which zoic to Mesozoic lithotectonic assemblages that originated consists of upper Carnian to upper Norian sandstone, silt- in ocean basin, volcanic arc and clastic basin environments.stone, conglomerate and minor micritic limestone that were These assemblagesare juxtaposed across complex systems deposited mainly as turbidites. The Hurley Fomation is of contractional, strike-slip and extensional faultsof mainly stratigraphically underlain by mafic volcanic rocks thatare Cretaceous and Tertiary age, and are intruded by plutonic also part of the Cadwallader Group, andis locally werlain rocks of mid-Cretaceous through early Tertiary age. This by a succession of Lower to Middle Jurassic shales, siliceous strongly tectonized belt extends southward into the north argillites and siltstones assigned to the JunctionCrwk unit. Cascade Mountains of northern Washington state, and sepa-The Tyaughton Group and LastCreek formatihn, whichare rates the Intermontane Belt to theeast from predominantly restricted to the northwestern exposures of Cadwallader plutonic rocks of the southwestern Coast Belt. Terrane, are facies equivalentsof the Hurley Formation and The Taseko -Bridge River area is underlain bylate Pa- Junction Creek unit.The Tyaughton Group compri.;es mid- leozoic and Mesozoic rocks of the Bridge River, Cadwal- dle to upper Norian nonmarine and shallowmarine con- lader and Methow terranes, together with Permianophioliticglomerate, sandstone and minor limestone, wXle the rocks of the Shulaps and Bralome-East Liza complexes, andoverlying Last Creek formationis a transgressive s:quence Jura-Cretaceous clastic sedimentary strataof the Tyaughton comprising upper Hettangian to Sinemurian conglomerate basin. These Paleozoic and Mesozoic rocksare locally over- and sandstone grading upward into upper Sinemurian to lain by Paleogene volcanic and sedimentary rocks, and by middle Bajocian shale. The volcanic rocks OF the Cadwal- Miocene to Pliocene plateau lavas. They are intruded by lader Group have trace element compositions simi:arto is- Cretaceous and Tertiary stocks and dikesof mainly felsicto land arc tholeiites, and the clastic rocks of the Hurley intermediate composition, and bya batholith of Late Creta- Formation, Tyaughton Group and Last Creek formation ceous granodiorite which occupies muchof the southwest- contain clastsof limestone, basalt, andesite, dacite, rhyolite ern part ofthe map area. and granitoids.The Cadwallader Terraneis therefore inter- preted as part of a Late Triassic volcanic arc and [ringing The Bridge River Terrane is represented mainly by the clastic apron. Bridge River Complex, an assemblage of chat, argillite, greenstone, gabbro, blueschist, serpentinite, limestone and Ophiolitic rocks in the Taseko - Bridge River area are clastic sedimentary rocks, with no coherent stratigraphy. assigned to the Shulaps Ultramafic Complex and the Dated cherts and limestones within the complex range fromBralome-East Liza Complex.The Shulaps Complv,. covers Mississippian to late Middle Jurassicin age, and blueschist- most of the northern ShulapsRange and consistsof ~.woma- facics mctamorphic rocks yield Middle to Late TriassicAr- jor structural divisions: an upper unit of harzburgite and Ar radiometric dates. Their wide age range and structural dunite with a mantle tectonite fabric, anda structurally un- complexity, together with the presenceof blueschist-facies derlying serpentinitemtlange unit comprising shearedser- metamorphic rocks, suggest that these rocks represent an pentinite with knockers of ultramafic cumulates, la.{ered to accretion-subduction complex that formed in Middle Trias-isotropic gabbros, amphibolite, rodingite, and volcanic and sic to latest Middle Jurassic time.The upper partof Bridge sedimentary rocks. Late Paleozoic radiometric dates from River Terrane comprisesa succession of clastic sedimentary plutonic and metamorphic knockers within the sercentinite _" Bulletin 100 iii _- mklange unit are interpreted as the age of ocean-floor plu- tain exposures, here assignedto the Tosh Creek succession, tonism and metamorphism associated with construction of may represent a transitional unit betweenRelay Mountain Shulaps oceanic crust. Large-scale structural inversion of clastics and coeval volcanic rocks within the western ?art the original ophiolite stratigraphy occurred in mid.-Creta- of the Coast Belt.The basal contact of the Relay Mountain ceous time during its thrust-emplacement above Cadwal- Group is not exposed, butindirect evidence suggests that it lader Terrane, which lies beneath the Shulaps Complex was deposited on the Bridge River Complex, which is in- across a southwest-vergent thrust systemthat is exposed in ferred to underlie the main belt of Tyaughton basin rccks the southwest corner of the Shulaps Range. The Bralorne- from the study area northwestward to Chilko Lake. H.,w- East Liza Complexconsists of greenstone, diorite, tonalite, ever, since correlative Jura-Cretaceoussiltstones and fine- gabbro and serpentinite that are imbricated with Cadwal- grained sandstones that are exposed very locally in the lader Terrane throughoutthe southern part of the Taseko- Camelsfoot Range (Grouse Creek unit)are. in apparentma- Bridge River area. It includes rocks previously assignedto tigraphic contact withCadwallader Terrane, and a separate the Bralorne and President intrusions,as well as some rocks belt of Jura-Cretaceous rocks assigned to the Relay Mwn- that had beenincluded in the Pioneer Formationof the Cad- tainGroup 1OOkilometres tothenorthwest isin stratigraphic wallader Group.These rocks are lithologically similarto the contact with Middle Jurassicrocks of Methow Terrane, the plutonic and volcanic knockers found within the Shulaps unit is interpreted to be an overIap assemblage. serpentinite mClange unit, and have yielded similar1,atePa- The upper part of the Tyaughton basin consisti of leozoic radiometricdates. They may represent slicesof Shu- synorogenic clastic sedimentary rocks ofthe Taylor C~ek laps oceanic crust that were imbricated with Cadwallader Group and Silverquick formation, which were deposited Terrane during obduction of the Shulaps Complex. during the episode of mid to Late Cretaceous contractional Rocks assigned to MethowTerrane underlie the north- deformation that characterizes the southeastern Co;st - eastern part of the Taseko - Bridge River area andare sepa- north Cascades orogen. These strata rest unconformably
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