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Syntectonic plutonism in north-central Wopmay Orogen (early Proterozoic), Hepburn Lake map area, District of Mackenzie

Hoffman, P. F. and St. Onge, M. R. and Easton, R. M. and Grotzinger, J. and Schulze, D. E. (1980) Syntectonic plutonism in north-central Wopmay Orogen (early Proterozoic), Hepburn Lake map area, District of Mackenzie. Geological Survey of Canada, 80 (1A). pp. 171-177. ISSN 0068-7650.

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Syn- to post-tectonic plutons in the area are clustered to form the composite Hepburn and Wentzel batholiths. Although granite is most abundant, the overall compositional range is from granite to pyroxenite. In general, the plutons become more basic and less deformed with time. The peak of metamorphism is related to the earliest granites, younger plutons being discordant with respect to the metamorphic isograds. Wentzel Batholith is the roof of a plutonic complex exposed in the core of a major anticlinorium. Hepburn Batholith comprises the floor and feeders to a pancakeshaped plutonic complex preserved in the keel of a synclinorium. The batholiths were emplaced during closure of these folds and after craton-vergent thrusting. Their setting is comparable to that of Cenozoic continental collision zones.

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Grotzinger, J.0000-0001-9324-1257
Additional Information:We are grateful to the Resident Geologist, Department of Indian and Northern Affairs, Yellowknife for logistical support. D.M. Carmichael (Queen's University) visited us in the field and contributed both mapping and encouragement.
Subject Keywords:igneous and metamorphic petrology; structural geology; diorites; gabbros; granites; plutons; batholiths; biotite isograds; andalusite isograds; sillimanite isograds; staurolite isograds; Dumas Group; Hepburn Batholith; Hepburn Meta-pluton Belt; Hornby Bay Group; Wentzel Batholith; Wopmay Fault; Wopmay Orogen; Precambrian; Proterozoic
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Issue or Number:1A
Record Number:CaltechAUTHORS:20141008-160629035
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:50289
Deposited On:09 Oct 2014 22:52
Last Modified:03 Oct 2019 07:22

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