Preliminary stratigraphy and geochronology of the Hazelton Group, Kitsault River area, Stikine terrane, northwest British Columbia Rebecca C. Hunter1, a, and Bram I. van Straaten1 1 British Columbia Geological Survey, Ministry of Energy, Mines and Petroleum Resources, Victoria, BC, V8W 9N3 a corresponding author:
[email protected] Recommended citation: Hunter, R.C., and van Straaten, B.I., 2020. Preliminary stratigraphy and geochronology of the Hazelton Group, Kitsault River area, Stikine terrane, northwest British Columbia. In: Geological Fieldwork 2019, British Columbia Ministry of Energy, Mines and Petroleum Resources, British Columbia Geological Survey Paper 2020-01, pp. 101-118. Abstract The Kitsault River area, at the southern end of the Iskut-Stewart mineral belt of northwestern Stikinia, hosts porphyry Cu-Au, porphyry- related gold, and precious metal-rich VMS deposits in Hazelton Group volcano-sedimentary rocks. Based on new mapping northwest and east of Kinskuch Lake, we further resolve stratigraphic relationships in the lower part of the Hazelton Group and recognize three new facies and two new sub-facies. Facies 1 and 3 consist of lapilli tuff to tuff breccia with hornblende-plagioclase-phyric clasts and minor interbedded epiclastic rocks. Facies 2 consists of predominantly epiclastic rocks. Facies 3 is further subdivided into sub-facies 3a, a distinctive unit of K-feldspar- and plagioclase-phyric fl ows and lapilli tuffs to tuff breccia and sub-facies 3b, a mixed volcano-sedimentary unit with local features indicating subaerial deposition. New U-Pb zircon data provide age constraints to the Hazelton Group in the area, including a maximum depositional age from detrital zircons (U-Pb, LA-ICPMS) of ca.