Project: Petrographic and geochemical study of Cache Creek Terrane ultramafic rocks, Nahlin Mountain, Cassiar District, BC
The targets of this study are the ultramafic rocks of the Cache Creek Terrane in northwestern British Columbia. This terrane represents obducted segments of oceanic lithosphere, with ophiolitic mantle rocks ranging from fertile lherzolite to depleted dunite that are exposed along several peaks and ridges south and southeast of Atlin, B.C, north of the Nakina fault. This study aims to better constrain the contact relations, alteration (including serpentinization and formation of awaruite), structure, and distribution of these rocks on Nahlin Mountain through detailed mapping during summer 2015.
Field logistics will be assisted in part by the TGI4/GEMS program of the Geological Survey of Canada (A. Zagorevski). Geochemical, petrographic, and mineral chemical investigations by various means (XRF, ICP-MS, SEM) will be conducted at UVic throughout the fall and winter of 2015-2016 to document the thermal history of the ophiolite, alteration history, and conditions for awaruite precipitation, among other themes.