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TitleGeology of the Cache Creek terrane in the Peridotite Peak - Menatatuline Range area, northwestern British Columbia (Parts of NTS 104K/15, /16)
AuthorMcGoldrick, S; Zagorevski, AORCID logo; Canil, D; Corriveau, A -S; Bichlmaier, S; Carroll, S
SourceGeoscience BC, Report 2016-1, 2016 p. 149-162
LinksOnline - En ligne
Alt SeriesEarth Sciences Sector, Contribution Series 20150308
PublisherGeoscience BC
Mediapaper; on-line; digital
File formatpdf
ProvinceBritish Columbia
NTS104K/15; 104K/16
Lat/Long WENS-132.4167 -132.1667 58.9667 58.9167
Subjectsgeneral geology; tectonics; ophiolites; magmatic rocks; magmatic deposits; tectonic history; geological research; geological surveys
Illustrationsimages; location maps; photographs; geological sketch maps
ProgramGEM2: Geo-mapping for Energy and Minerals Western Cordillera, Cache Creek Terrane
Released2016 01 01
AbstractOphiolites are ubiquitous features of Phanerozoic orogens around the world where they are bound by major suture zones along which oceanic basins were consumed. The Canadian Cordillera hosts several belts of structurally dismembered upper Paleozoic-lower Mesozoic ophiolites. The largest and best-preserved of these ophiolites is the Nahlin ultramafic body, which is exposed within the oceanic Cache Creek terrane.The Nahlin ultramafic body in the northern section of the Cache Creek terrane appears to conspicuously lack components of the classic Penrose-style ophiolite, most notably the sheeted dyke complex and significant lower crustal cumulates. However, the mantle, lower crustal and hypabyssal intrusions, and volcano-sedimentary sequences are all present, if structurally disrupted, within the Cache Creek terrane. The features of the Nahlin ultramafic body, including the absent sheeted dyke complex and significant supracrustal sequences, are similar to other Tethyan ophiolites that are now suggested to represent oceanic core complexes exhumed along low angle detachments on the ocean floor. Future work on this project will aim to determine if this interpretation can be applied to the Nahlin ultramafic body.
Summary(Plain Language Summary, not published)
This report presents preliminary results and models developed through GEM2 program on the ancient oceanic crust in British Columbia and Yukon. It details the distribution and characteristics of the various rock packages on the basis of field and laboratory analyses. It compares these data to modern analogues. The results presented herein help progress GEM2 model to ultimately redefine the regional tectonic models of the Cordillera.

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