Abstract: Although deformed and metamorphosed, the strata hosting volcanogenic massive sulphide deposits in the Finlayson Lake district retain characteristics that suggest the influence of syn-depositional faults near the deposits. The Fyre Lake deposit occurs within a mafic schist unit near where notable changes in thickness, rock type and amount of comagmatic metaplutonic rocks occur. These changes occur across a north-northwest-striking corridor along which deposits and prospects in the overlying felsic metavolcanic schist are distributed (including Kudz Ze Kayah). Syn-volcanic, syn-mineralization faulting would explain the association of these deposits with the observed changes in host rock characteristics. Using similar arguments, syn-mineralization faults have been inferred on the Hat Trick property southwest of Fire Lake, as well as in Pennsylvanian and Permian rocks of the Campbell Range succession. Finally, stratigraphic differences between coeval rocks in the hanging wall and footwall of the Money Creek thrust imply that the thrust may have re-activated a syn-depositional structure. The regions of hanging wall and footwall cut-offs of the Money Creek thrust would therefore be considered as highly prospective for massive sulphide deposits.

Authors: Murphy, D.C. and Piercey, S.J.

Keywords: mineral potential, Structural Geology

NTS Mapsheet(s): 105G

Citation: Murphy, D.C. and Piercey, S.J., 2000. Syn-mineralization faults and their re-activation, Finlayson Lake massive sulphide district, Yukon-Tanana Terrane, southeastern Yukon. In: Yukon Exploration and Geology 1999, Emond, D.S. and Weston, L.W. (eds.), Exploration and Geological Sciences Division, Yukon Region, Indian and Northern Affairs Canada, p. 55-66.

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