Abstract: Revision geological mapping has shown that the Robert Service Thrust is imbricated and isoclinally folded in Mayo map area. On Fork Plateau, highly deformed Keno Hill quartzite and meta-diorite that occur above the hanging wall Hyland Group are inferred to be antiformal windows resulting from folding of the fault surface. The occurrence of vuggy meta-diorite on Fork Plateau, geochemically anomalous headwater creeks and placer mining downstream, indicates that the Fork Plateau may warrant further exploration.

Authors: Roots, C.F.

Map Scale: 1 : 0

NTS Mapsheet(s): 105M

Citation: Roots, C.F. , 1993. Nature of the Robert Service Thrust on Fork Plateau and implications for mineral exploration, Mayo map area. In: Yukon Exploration and Geology 1992, Yukon Exploration of Geology , Indian & Northern Affairs Canada/Department of Indian & Northern Development: Exploration & Geological Services Division, 71-76.

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