AbstractsEarth & Environmental Science

Structural studies in an area at the headwaters of the McMurdo Creek, B.C.

by Gerald Gordon Lewis Henderson

Institution: McGill University
Department: Department of Earth Sciences.
Degree: MS.
Year: 1950
Keywords: Geological Sciences.
Record ID: 1554854
Full text PDF: http://digitool.library.mcgill.ca/thesisfile122753.pdf


The map-area straddles the crest of a major anticline within the Purcell Mountains of British Columbia. It is underlain by a conformable series of precambrian quartzite, limestone, and slate members. One limb of the major anticline is disturbed locally by a zone of minor folding. This minor folding has caused considerable plastic flowage in a thick limestone member of the series. As a result of the flowage, the limestone beds are intricately folded and have developed a distinctive layered structure. The origin of this layering by metamorphic differentiation is discussed. A series of quartz veins, containing small amounts of gold, occurs along the crest of the major anticline principally within the uppermost quartzite member. These appear to have been deposited from solutions which invaded fissures formed as a result of the folding.