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Origin and Tectonic Setting of Ophiolitic Ultramafic and Related Rocks in the Atlin Area, British Columbia (NTS 104N)

Christopher Henry Ash (H.)British Columbia. Geological Survey Branch

出版	Province of British Columbia, Ministry of Energy, Mines and Petroleum Resources, Mineral Resources Division, Geological Survey Branch, 1994
主題	Science / Earth Sciences / Geology
ISBN	07726221599780772622150
URL	http://books.google.com.hk/books?id=ouZRAQAAIAAJ&hl=&source=gbs_api

註釋

This paper presents the results of a detailed investigation of the tectonic setting and origin of ultramafic and related rocks in the Atlin area. The Atlin area was selected for detailed study because of its excellent road access, the large number of listwanite-related lode gold occurrences, and the extensive exploration database available for many of these occurrences. Following detailed mapping of the ultramafic rocks underlying the town of Atlin and Monarch Mountain in 1989, the area was revisited in 1990 and the map area extended to establish tectonic relationships between the ultramafic and surrounding lithologies. The phase chemistry of the harzburgite and associated dunite were investigated and are used to establish the origin of the units. Whole-rock major, trace, and rare-earth element chemistry is presented for basaltic rocks spatially associated with the ultramafics. These data are used to place constraints on the paleotectonic eruptive setting of the unit and to model the character of the mantle source from which the rocks were derived.