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Yukon Geological Survey

YGS Publication Details


Reference Number
YEG2021_7
Title
Geology of the Carpenter Creek and McKay Hill areas (NTS 106D/6, 11), central Yukon
Reference Type
Yukon Geological Survey
Document Type
Annual Report Paper


General Information

Abstract: The Carpenter Creek area straddles the Paleozoic basin-platform transition which is coincident with the Dawson thrust in north-central Yukon. North of the thrust, the strata can be broadly divided into two groups: (1) Proterozoic sedimentary and intrusive rocks, and (2) Paleozoic platformal strata with volcanic rock horizons. The two groups of rocks are separated by an angular unconformity. Below the unconformity, Hart River gabbro sills and dikes (ca. 1.38 Ga) intrude the Gillespie Lake Group. Younger Proterozoic rocks that are not intruded by the gabbro occur on the other side of a fault that traces through the Carpenter Creek valley. These rocks are interpreted to be younger than Gillespie Lake Group and are tentatively assigned to Pinguicula Group. Above the unconformity, Paleozoic volcanic and volcaniclastic rocks are interstratified with carbonate rocks. The volcanic rocks occur near the base and top of the Bouvette Formation.
South of the Dawson thrust, in its direct hangingwall, volcanic and volcaniclastic rocks are interlayered with shale, chert and sandstone and intruded by discontinuous gabbro bodies of unknown age. Rare limestone lenses within the volcanic rocks contain coral fossils that constrain the age of these rocks to Middle Ordovician or younger. Hyland Group rocks are thrust over the volcanic unit and comprise shale, quartz grit and limestone. Shale exhibits a well-developed foliation, oriented parallel to the northwest-trending structural grain. Tight folds with NW-SE striking axial planes repeats stratigraphy south of the Dawson thrust.
Within the mapped area, Ag-Pb-Zn ± Au mineralization near Grey Copper Hill occurs right along the unconformity between Upper (?) Proterozoic rocks and the Bouvette Formation (Figs. 1 and 2). Au-Ag-Cu-Pb-mineralization is spatially associated with a strike-slip fault that offsets shale, volcanic rocks and small gabbro bodies near McKay Hill (Figs. 1 and 2).
Authors: Cobbett, R.
NTS Mapsheet(s): 106D06, 106D11
Citation: Cobbett, R., 2022. Geology of the Carpenter Creek and McKay Hill areas (NTS 106D/6, 11), central Yukon. In: Yukon Exploration and Geology 2021, K.E. MacFarlane (ed.), Yukon Geological Survey, p. 125–142.

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NTS Mapsheet(s): 106D06, 106D11

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YEG2021 Contained By Yukon Geological Survey Yukon Exploration and Geology 2021