Abstract: Results from an airborne gamma ray and magnetics survey in the Dawson Range in west-central Yukon indicate that the Pattison Creek pluton may be larger than currently mapped. Ground follow-up indicates that the pluton is approximately three times larger than originally shown. This pluton is a member of the Casino Intrusions - a unit identified as being genetically associated with copper-molybdenum mineralization and as such is considered a good exploration target. Examination of the pluton indicates that it is a highly fractionated, epizonal stock composed primarily of granite and alkali feldspar granite with later phases of peraluminous muscovite-bearing alaskite and aplite. Microthermometric and isotopic data indicate that mineralizing hydrothermal fluids are of low salinity, and depleted in deuterium and delta Oxygen-18 relative to values typical of magmatic waters. The gamma-ray survey shows it to have among the highest U and Th values in the survey area (> 3.0 and 15 ppm respectively).

Authors: Hart, C.J.R. and Selby, D.

Keywords: Airborne geophysics

NTS Mapsheet(s): 115I, 115J

Citation: Hart, C.J.R. and Selby, D., 1998. The Pattison Creek pluton - a mineralized Casino Intrusion made bigger with gamma rays. In: Yukon Exploration and Geology 1997, Roots, C.F. (ed.), Exploration and Geological Sciences Division, Yukon Region, Indian and Northern Affairs Canada, p. 89-96.

Downloads

Name	Comment
Report	File is .86 MB	Download PDF