Yukon Geological Survey publication metadata (English, HTML)

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2026-08-26

The Mount Skukum Volcanic Complex (MSVC) is the northernmost extension of the Sloko volcanic province in western British Columbia, a broad northwest-trending volcanic belt along the northeast margin of the Coast Plutonic Belt. Rocks of the Sloko volcanic province are preserved as downfaulted blocks and as erosional remnants on higher upland surfaces. They comprise an assemblage of intermediate to felsic volcanic rocks and derived sedimentary rocks that lie unconformably on Cretaceous granitic rocks, folded Jurassic rocks and Precambrian (?) metasedimentary rocks. The MSVC is Paleocene-Eocene in age, and elliptical in plan; it covers an area of about 140 km squared. It is a downfaulted volcanic block, deposited on Cretaceous granitic rocks of the Ruby Range Batholith and older metasedimentary rocks of the Yukon Group. The complex is surrounded peripherally by several high-level rhyolite intrusions which have recently been dated at 53 ±1.1 Ma using rubidium-strontium geochronology. The MSVC has a maximum vertical thickness of 850 m. It includes:: 1) a downfaulted part of an andesitic stratovolcano which forms the western and southern parts of the complex and comprises the distal…

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