Abstract: Rocks assigned to the Windy McKinley Terrane occur in Stevenson Ridge and Kluane map areas of western Yukon. Based on new mapping in Stevenson Ridge area, rocks mapped as Windy McKinley Terrane have been divided into three fault-bound assemblages: 1) a structurally lowest assemblage of muscovite-quartz schist, calcsilicate schist, and minor marble, carbonaceous quartzite and schist, pebble meta- onglomerate and granitic meta-plutonic rocks; 2) an imbricated ophiolitic assemblage of meta-chert, probably intrusive greenstone, leucogabbro, variably serpentinized dunite and harzburgite, and mafic greywacke; and 3) an assemblage of fine-grained clastic and calcareous rocks intruded and variably hornfelsed by voluminous Early Triassic (Mortensen and Israel, 2006) gabbro. Assemblage 1 probably correlates with Yukon-Tanana Terrane. Assemblage 2 more strongly resembles the Chulitna Terrane of Alaska rather than either the Windy or McKinley terranes as originally defined. Assemblage 3 resembles part of McKinley Terrane, as well as the Aurora Peak and Pingston terranes. These terrane re-assignments have implications for the area¿s mineral potential.

Authors: Murphy, D.C.

Keywords: Chulitna terrane, Kluane, mineral potential, Structural Geology, Yukon-Tanana terrane

NTS Mapsheet(s): 115J, 115K

Citation: Murphy, D.C., 2007. The three `Windy McKinley' terranes of Stevenson Ridge (115JK), western Yukon. In: Yukon Exploration and Geology 2006, Emond, D.S., Lewis, L.L., and Weston, L.H. (eds.), Yukon Geological Survey, p. 223-236.

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