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Geology of the Tatlayoko Lake - Beece Creek Area

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Geology of the Tatlayoko Lake - Beece Creek Area Ministry of Employment andInvemnent GEOLOGY OF THE TATLAYOKO LAKE - BEECE CREEK AREA By Paul Schiarizza and Janet Riddell KEYWORD2 Eastern Coast BelL Bridge River Complex, ping that extends for 350 kilometres along the northeast Cadwallader Terrane, Stikine Terrane, Mount Moore for- margin of the southern Coast Belt (Figure 1). mation, Methow Terrane, Mount Skinner Igneous Complex, The Tatlayoko project was initiated in 1992 with geo- Hucklebeny formation, Tyaughton - Methow basin, Relay logical mapping of the Mount Tatlow map area (Riddell et Mountain Group, Jackass Mountain Group, Taylor Creek al., 1993a, b). No fieldwork was done in 1993, but the project was continued in 1994 with geological mapping of Group, Powell Creek formation, Yalakom fault, Fish Lake the Tatlayoko Lake map area (Schiarizza et al., 1995a, b). porphyry Cu-Au deposit, Skinner goldquartz vein. Fieldwork was completed in July of 1995, when two and a half weeks were spent mapping in the Niut Range in the INTRODUCTION northwestern comer of the project area, and two days were spent revisiting the geology near Fish Lake (Schiarizza, The Tatlayoko bedrock mapping program was de- 1996). This report presents an overview of the geology of signed to update the geological database for the eastern the study area, and summarizes the major findings of the Coast Belt in parts of the Mount Waddington and Taseko project. More detailed discussion of several aspects of the Lakes map areas, and to integrate the structural &d strati- geology will be presented in papers that will be submitted graphic relationships established within this area with rap- to external scientific journals. In addition, updated idly evolving concepts regarding the tectonic and 1:50 000-scale geology maps willbe published (B.C. Geos- stratigraphic framework of the region. This will provide an cience map series) after radiometn'c dates and fossil iden- improved geological framework for understanding the set- tifications have been finalized. tings and controls of known mineral occurrences in the area The Tatlayoko project area covers the transition from (e.g., Fish Lake, Skinner) and for evaluating the potential the rugged Coast Mountains in the southwest, to gently for additional discoveries. The project ties in with earlier rolling topography of the Fraser Plateau to the northeast. mapping by the Geological Survey Branch tothe southeast, Mount Nemaia, in the central part of the area, is 250 and with concurrent mapping directed by P. van der Hey- kilometres north-northwest of Vancouver and 155 kilome- den and P. Mustard of the Geological Survey of Canada to tres southwest of Williams Lake. The eastern part of the thenorthwest (see Mustard and van der Heyden, 1997, this area is accessed by an all-season road that extends south- volume), thus completing a continuous belt of recent map westward from Highway 20 at Hanceville to the Nemaia valley. A seasonal road branches off it at the Taseko River and continues southward to the Taseko Lakes. Tatlayoko Lake, in the western pm of the area, is accessed by an all-season road that extends south from Highway 20 at Tatla Lake. A branch from this road extends eastward to the north end of Chilko Lake, and a seasonal road crosses the Chilko River and continues southward to Tsuniah Lake and the Nemaia valley. REGIONAL GEOLOGIC SETTING van der neyden er al. (1994) Mustard el a1 (1994) The geologic setting of the Tatlayoko project area is Hickson and others. 1989-1993 summarized in Figure 2. It encompasses the boundary between the Coast and Intermontane morphogeologic Rusmore and Woodo*orlh (1993) belts. Within the Tatlayoko project area this boundary corresponds to the Yalakom fault, a major linear feature Mchren 11990). McLaren and Rouse (1989) that extends for about 300 kilometres and was the locus of more than 100 kilometres of Late Cretaceous(?) to early Tertiary dextral displacement (Riddell et al., 1993a). Figure 1. Location of the Tatlayoko project area, and index to recent geological mapping by the British Columbia Geological The eastern Coast Belt in the region of the Tatlayoko Survey Branch and Geological Survey of Canadain adjacent parts project area can be subdivided into the South Chilcotin, of the southeastern Coast Belt and Intermontane Belt Methow and Niut domains, each with contrasting Paper 1997-2 63 British Coldin \it++++ /:::::::/ Paleogene volcanic rocks Triassic & Jurassic rocks of Stikine Terrane Liliooet Lake domain Mississippian to Jurassic of Bald Mountain belt figure 2. Geologic setting of the Tatlayoko project area. stratigraphy and structural style (Figure 2). The South vergent eastern Waddington thrust belt (Rusmore and Chilcotin domain includes Mississippian to Jurassic oce- Woodsworth, 1991b; van der Heyden et al., 1994a). The anic rocks of the Bridge River accretion-subduction com- northeast boundary of the domain is a system of faults, plex, Upper Triassic to Middle Jurassic arc-derived including the Tchaikazan and West Niut faults, that juxta- volcanic and clastic sedimentary rocks of Cadwallader poses it against the South Chilcotin and Methow domains Terrane, Permian opbiolitic rocks of the Shulaps and to the northeast (Figure 2). Bralorne - East Liza complexes, Upper Jurassic to mid-Cre- The Intermontane Belt is characterized by subdued taceous clastic sedimentary rocks of the Tyaughton - topography and sparse bedrock exposure. Pre-Neogene Methow basin, and Upper Cretaceous subaerial volcanic strata nonh of Chilko Lake comprise volcanic and volcani- rocks of the Powell Creek formation. These partially coeval clastic rocks that have been correlated with the Lower to lithotectonic assemblages are juxtaposed across a complex Middle Jurassic Hazelton Group of the Stikine Terrane network of structures that is dominated by middle to Late (Tipper, 1969a. b). To the west, these rocks are juxtaposed Cretaceous southwest-directed contractional faults, and against penetratively deformed metasedimentuy, metavol- Late Cretaceous to early Tertiary dextral shike-slip faults. canic and metaplutonic rocks of the Tatla Lake Metamor- The Methow domain occurs to the north and northeast phic Complex across an east to northeast-dipping normal of the South Chilcotin domain, and is distinguished by a fault. This fault formed late in the structural history of the less complex structural style dominated by widely spaced complex, which was ductilely sheared and exhumed in faults and broad folds. The two domains are separated in Eocene time (Friedman and Armstrong, 1988), possibly in part by the Yalakom fault, and in pan by anearlierswcture a structural regime linked to dextral movement along the that is offset by the Yalakom fault. This earlier structure is Yalakom fault (Schiarizza et al., 1995a). referred to as the Camelsfoot fault in the south (Schiarizza To the southeast is a belt of mainly Cretaceous sedi- et a[., 1993b; Schiarizza and Garver, 1995) and the Konni mentary, volcanic and plutonic rocks that extends from the Lake fault in the north (Riddell et al., 1993a). Methow Taseko River to the Fraser River. Exposures near the domain is underlain mainly by Lower to Middle Jurassic Taseko River include Hauterivian sedimentary and vol- sedimentary and volcanic rocks of the Methow Terrane, canic rocks that may correlate with those of Niut domain, and overlying Upper Jurassic to mid-Cretaceous clastic as well as younger Aptian-Albian conglomerates that re- sedimentary rocks of the Tyaughton - Methow basin. Older semble the Jackass Mountain Group of the Methow domain rocks are exposed locally and include Middle to Late (Fish Lake area of Figure 3). Farther to the southeast, near Triassic quartz dioritic intrusions and overlying Upper the Fraser River, this belt comprises Lower Cretaceous Triassic sedimentary rocks that outcrop near Tatlayoko volcanic rocks of the Spences Bridge Group and an over- Lake. The Jurassic rocks of Methow Terrane are lithologi- lying succession of middle to Upper Cretaceous sedimen- cally distinct from age-equivalent rocks found within the tary and volcanic rocks (Green, 1990; Hickson, 1992; Gang Cadwallader and Bridge River terranes of the South Chil- Ranch area of Figure 2). Underlying rocks are not exposed, cotin domain. The upper part of the Tyaughton-Methow but correlative rocks to the east of the Fraser fault overlap basin, within the Metbow domain (the Jackass Mountain Quesnel and Cache Creek terranes (Monger and McMillan, Group), is also distinct from coeval rocks comprising the 1989). upper part of the basin in the South Chilcotin domain (the Taylor Creek Group). The lower part of the Tyaughton - LITHOLOGIC UNITS Methow basin, represented by the Jura-Cretaceous Relay Mountain Group, is, however, common to both domains The main tectonostratigraphic assemblages exposed in (Figure 3). the Tatlayoko project area are summarized on Figure 3. The Niut domain is underlain largely by Upper Trias- They include late Paleozoic to Middle Jurassic volcanic, sic volcanic and sedimentary rocks of the Mount Moore sedimentary and plutonic rocks that are assigned to Bridge and Mosley formations, associated Late Triassic plutons, River, Cadwallader, Methow and Stikine terranes, as well and Lower Cretaceous volcanic and sedimentary rocks as Jura-Cretaceous clastic sedimentary rocks of the assigned to the Ottarasko and Cloud Drifter formations Tyaughton - Methow basin and Upper Cretaceous volcanic (Rusmore and Woodsworth, 1991a; Mustard and van der and volcaniclastic rocks of the Powell Creek formation. Heyden, 1994). Both the Triassic
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