Abstract: Sedimentary and volcanic rocks ranging in age from Precambrian to Lower Cretaceous underlie the Tombstone area (116 A/4). The conditions of metamorphism of the sedimentary sequence underlying the study area are reflected by the stability field of the univariant assemblage tremolite-calcite-quartz-diopside. Assuming a pressure of 2 kb, the temperature of metamorphism lies between 475° and 525° C.

The mineralogical zoning displayed in the host rocks away from the syenite is interpreted as being essentially the consequence of a decreasing amount of dolomite in the original sediments.

Authors: Barrette, P.

Map Scale: 1 : 0

NTS Mapsheet(s): 116A04

Citation: Barrette, P., 1982. Metamorphism of Sedimentary Rocks by Syenitic Intrusions in the Tombstone Range 116 A/4, Yukon Territory. In: Yukon Exploration and Geology 1981, Exploration and Geological Services Division (eds.), Indian & Northern Affairs Canada/Department of Indian & Northern Development: Exploration & Geological Services Division, 34-37.

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