Publication Summary
Issue ID: P2015-01-05
Title: U-Pb geochronology of the Hazelton Group in the McTagg anticliinorium, Iskut River area, northwestern British Columbia
Author(s): Cutts, J.A., McNicoll, V.J., Zagorevski, A., Anderson, R.G., Martin, K.
Series Name: Paper
Publication Year: 2015
Larger Work Citation: in Geological Fieldwork 2014, B.C. Ministry of Energy and Mines, Paper 2015-01
NTS Map Sheet(s): 104B
Place Keyword(s): British Columbia, Eskay Rift, Bruce Glacier, Treaty Ridge, Iskut
Lat/Long (NSWE): 57, 56, -130, -128
Theme Keyword(s): geochronology, Hazelton Group, Betty Creek Formation, Iskut River Formation, Salmon River Formation
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Abstract:
Early to Middle Jurassic rocks of the Hazelton Group are extensively mineralized, including the precious metal-rich Eskay Creek deposit that is hosted by bimodal volcanic successions in the Eskay rift. In this study, we present U-Pb zircon ages of seven Hazelton Group volcanic, epiclastic and hypabyssal rocks to establish the absolute ages of Hazelton Group units in the McTagg anticlinorium, east of the Eskay Creek deposit. A felsic volcaniclastic sample from the Brucejack Lake member (Betty Creek Formation) yielded a 187.1±1.9 Ma U-Pb crystallization age that is consistent with previous fossil and U-Pb age determinations. Six samples from the Bruce Glacier member (Iskut River/Salmon River Formation) yielded U-Pb crystallization ages of 178.5±1.8, 174.6±1.8, 174.4±1.7, 174.7±1.8, 173.6±1.7, and 173.3±1.8 Ma. These ages indicate that volcanic rocks coeval with the Eskay member occur in the McTagg anticlinorium, as far south as Mt. Dilworth.