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• W2008486644 abstract "Research Article| September 01, 2001 Enriched Archean lithospheric mantle beneath western Churchill Province tapped during Paleoproterozoic orogenesis Brian L. Cousens; Brian L. Cousens 1Ottawa-Carleton Geoscience Centre, Carleton University, Ottawa, Ontario K1S 5B6, Canada Search for other works by this author on: GSW Google Scholar Lawrence B. Aspler; Lawrence B. Aspler 223 Newton Street, Ottawa, Ontario K1S 2S6, Canada Search for other works by this author on: GSW Google Scholar Jeffrey R. Chiarenzelli; Jeffrey R. Chiarenzelli 3Department of Geology, State University of New York at Potsdam, Potsdam, New York 13976, USA Search for other works by this author on: GSW Google Scholar J. Allan Donaldson; J. Allan Donaldson 4Ottawa-Carleton Geoscience Centre, Carleton University, Ottawa, Ontario K1S 5B6, Canada Search for other works by this author on: GSW Google Scholar Hamish Sandeman; Hamish Sandeman 5Canada-Nunavut Geoscience Office, P.O. Box 2319, Iqaluit, Nunavut X0A 0H0, Canada Search for other works by this author on: GSW Google Scholar Tony D. Peterson; Tony D. Peterson 6Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario K1A 0E8, Canada Search for other works by this author on: GSW Google Scholar Anthony N. LeCheminant Anthony N. LeCheminant 6Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario K1A 0E8, Canada Search for other works by this author on: GSW Google Scholar Author and Article Information Brian L. Cousens 1Ottawa-Carleton Geoscience Centre, Carleton University, Ottawa, Ontario K1S 5B6, Canada Lawrence B. Aspler 223 Newton Street, Ottawa, Ontario K1S 2S6, Canada Jeffrey R. Chiarenzelli 3Department of Geology, State University of New York at Potsdam, Potsdam, New York 13976, USA J. Allan Donaldson 4Ottawa-Carleton Geoscience Centre, Carleton University, Ottawa, Ontario K1S 5B6, Canada Hamish Sandeman 5Canada-Nunavut Geoscience Office, P.O. Box 2319, Iqaluit, Nunavut X0A 0H0, Canada Tony D. Peterson 6Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario K1A 0E8, Canada Anthony N. LeCheminant 6Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario K1A 0E8, Canada Publisher: Geological Society of America Received: 11 Jan 2001 Revision Received: 30 Apr 2001 Accepted: 18 May 2001 First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2001) 29 (9): 827–830. https://doi.org/10.1130/0091-7613(2001)029<0827:EALMBW>2.0.CO;2 Article history Received: 11 Jan 2001 Revision Received: 30 Apr 2001 Accepted: 18 May 2001 First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Brian L. Cousens, Lawrence B. Aspler, Jeffrey R. Chiarenzelli, J. Allan Donaldson, Hamish Sandeman, Tony D. Peterson, Anthony N. LeCheminant; Enriched Archean lithospheric mantle beneath western Churchill Province tapped during Paleoproterozoic orogenesis. Geology 2001;; 29 (9): 827–830. doi: https://doi.org/10.1130/0091-7613(2001)029<0827:EALMBW>2.0.CO;2 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 SocietyGeology Search Advanced Search Abstract Ultrapotassic rocks of the Christopher Island Formation (Baker Lake basin) were emplaced across an enormous area (240 000 km2 minimum) of the western Churchill Province ca. 1.83 Ga. These rocks extend across the Snowbird zone, a geophysical feature postulated by others to represent a Paleoproterozoic suture that welded the Rae and Hearne domains. Minette dikes and flows of the Rae and Hearne domains display identical ϵNd, 1830 values and incompatible element patterns, and thus appear to have originated from a common lithospheric-mantle source. Christopher Island Nd model ages cluster at 2.8 Ga, and ϵNd data from one Archean lamprophyre and three 2.45 to ca. 2.2 Ga mafic suites suggest that enriched lithospheric-mantle sources beneath both the Rae and Hearne domains existed well before ca. 1.83 Ga, inconsistent with Paleoproterozoic suturing along the Snowbird zone. In contrast to commonly invoked models that envisage melting of local enriched domains, Christopher Island ultrapotassic rocks appear to have originated from an extensive reservoir. We suggest that such a reservoir was created during an Archean metasomatic event, perhaps owing to flat subduction, and that it remained in nearly complete isolation until tapped during Paleoproterozoic extension related to squeezing of western Churchill crust between flanking Wopmay and Trans-Hudson orogens. You do not have access to this content, please speak to your institutional administrator if you feel you should have access." @default.
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