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An assessment of the age and tectonic setting of volcanics near the base of the Windermere Supergroup in northeastern Washington; implications for latest Proterozoic-earliest Cambrian continental separation

William J. Devlin, Gerard C. Bond and Hannes K. Brueckner
An assessment of the age and tectonic setting of volcanics near the base of the Windermere Supergroup in northeastern Washington; implications for latest Proterozoic-earliest Cambrian continental separation
Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre (June 1985) 22 (6): 829-837

Abstract

New geochemical and isotopic data are presented for the mafic metavolcanics of the Huckleberry formation analysed by K/Ar techniques in an attempt to assess their tectonic setting and age of extrusion. Major- and trace-element compositions are found to be consistent with the rift setting previously interpreted for the Windermere supergroup. Isotopic analyses, although inconclusive with respect to the true age of the Huckleberry volcanics, indicate that the Rb-Sr system has been disturbed subsequent to extrusion of the volcanics, and therefore the K/Ar ages should be considered suspect. Recent isotopic data from the N Canadian Cordillera tend to indicate that the Windermere supergroup may in fact be younger, in closer agreement with the ages for breakup indicated by the subsidence analyses.


ISSN: 0008-4077
EISSN: 1480-3313
Coden: CJESAP
Serial Title: Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre
Serial Volume: 22
Serial Issue: 6
Title: An assessment of the age and tectonic setting of volcanics near the base of the Windermere Supergroup in northeastern Washington; implications for latest Proterozoic-earliest Cambrian continental separation
Affiliation: Lamont-Doherty Geol. Obs., Palisades, NY, United States
Pages: 829-837
Published: 198506
Text Language: English
Summary Language: French
Publisher: National Research Council of Canada, Ottawa, ON, Canada
References: 55
Accession Number: 1985-075193
Categories: Geochemistry of rocks, soils, and sedimentsIgneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Lamont-Doherty Geol. Obs.; Contrib. No. 3795
Illustration Description: illus. incl. 4 tables, geol. sketch map
N48°00'00" - N49°04'60", W118°10'00" - W116°49'60"
Country of Publication: Canada
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 1985
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