Sedimentary record for exhumation of ultrahigh pressure (UHP) rocks in the northern Cordillera, British Columbia, Canada

Research Article| September 01, 2006 Sedimentary record for exhumation of ultrahigh pressure (UHP) rocks in the northern Cordillera, British Columbia, Canada Dante Canil; Dante Canil 1School of Earth and Ocean Sciences, 3800 Finnerty Road, University of Victoria, Victoria, British Columbia V8W 3P6, Canada Search for other works by this author on: GSW Google Scholar Mitchell Mihalynuk; Mitchell Mihalynuk 2Geological Survey Branch, British Columbia Ministry of Energy and Mines, 1510 Blanshard Road, Victoria, British Columbia V8X 3H6, Canada Search for other works by this author on: GSW Google Scholar Courtney Charnell Courtney Charnell 3School of Earth and Ocean Sciences, 3800 Finnerty Road, University of Victoria, Victoria, British Columbia V8W 3P6, Canada Search for other works by this author on: GSW Google Scholar Author and Article Information Dante Canil 1School of Earth and Ocean Sciences, 3800 Finnerty Road, University of Victoria, Victoria, British Columbia V8W 3P6, Canada Mitchell Mihalynuk 2Geological Survey Branch, British Columbia Ministry of Energy and Mines, 1510 Blanshard Road, Victoria, British Columbia V8X 3H6, Canada Courtney Charnell 3School of Earth and Ocean Sciences, 3800 Finnerty Road, University of Victoria, Victoria, British Columbia V8W 3P6, Canada Publisher: Geological Society of America Received: 24 Oct 2005 Revision Received: 28 Mar 2006 Accepted: 18 Apr 2006 First Online: 08 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (2006) 118 (9-10): 1171–1184. https://doi.org/10.1130/B25921.1 Article history Received: 24 Oct 2005 Revision Received: 28 Mar 2006 Accepted: 18 Apr 2006 First Online: 08 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Dante Canil, Mitchell Mihalynuk, Courtney Charnell; Sedimentary record for exhumation of ultrahigh pressure (UHP) rocks in the northern Cordillera, British Columbia, Canada. GSA Bulletin 2006;; 118 (9-10): 1171–1184. doi: https://doi.org/10.1130/B25921.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract We use field relationships, paleoflow indicators, petrography, and major and trace element mineral chemistry to examine the protolith and provenance of detrital mantle-derived ultrahigh pressure (UHP—2.8 GPa) minerals in immature clastic sediments of an Early Jurassic basin (Laberge Group) in northwestern British Columbia, Canada. Our results show that fresh mantle detritus in the Laberge Group was derived from mantle lithosphere that equilibrated at >2.8 GPa and temperatures of 850–1100 °C, exhumed in orogenic massifs and quickly deposited over a restricted time interval. Two models are proposed for the exhumation and denudation of the UHP rocks in either (1) an arc-continent collision between the Stikinia and Yukon Tanana terranes, or (2) an exposed forearc and accretionary mélange in a convergent margin in the Cache Creek terrane. A collision between the Stikinia and Yukon Tanana terranes has not previously been documented, but this scenario is the most consistent with widespread evidence for rapid exposure of deep-seated rocks at the required time period for deposition of UHP detritus ca. 185 Ma. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.