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Yukon Geological Survey

YGS Publication Details


Reference Number
YEG1999_06
Title
Syn-mineralization faults and their re-activation, Finlayson Lake massive sulphide district, Yukon-Tanana Terrane, southeastern Yukon
Reference Type
Indian & Northern Affairs Canada/Department of Indian & Northern Development: Exploration & Geological Services Division
Document Type
Annual Report Paper


General Information

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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Report File is 3.54 MB Download PDF

Location Map

NTS Mapsheet(s): 105G

Related Occurrences

Name Number Type Status
Fyre Lake 105G 034 Hard-rock Deposit
Gp4f 105G 143 Hard-rock Deposit
Kudz Ze Kayah 105G 117 Hard-rock Deposit
Ice 105G 118 Hard-rock Deposit

Related Publications

Number Relationship Authors Title
YEG1999 Contained By Emond, D.S. and Weston, L.W. (eds.) Yukon Exploration and Geology 1999