| 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. |
