The age of the Mount Copeland syenite gneiss and its metamorphic zircons, Monashee Complex, southeastern British Columbia

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Authors:Parrish, R. R.; Scammell, Robert J.
Author Affiliations:Primary:
Geol. Surv. Can., Ottawa, On, Canada
Other:
Queen's Univ., Canada
Volume Title:Radiogenic age and isotopic studies; Report 2
Volume Authors:Mortensen, J. K., prefacer
Source:Radiogenic age and isotopic studies; Report 2, prefaced by J. K. Mortensen. Paper - Geological Survey of Canada, No.88-2, p.21-28. Publisher: Geological Survey of Canada, Ottawa, ON, Canada. ISSN: 0068-7650. ISBN: 0-660-13084-X
Publication Date:1988
Note:In English with French summary. 42 refs.; illus. incl. 1 table, geol. sketch map
Summary:The Mount Copeland syenite gneiss is a subconcordant alkaline igneous intrusion within metasedimentary rocks that overlie early Proterozoic crystalline basement in the Monashee complex. The gneiss contains zircons of two ages: 740 +- 36 m.y.-old relict grains and cores, interpreted as original igneous phenocrysts, and 59 +- 1 m.y.-old metamorphic grains and overgrowths, which form the bulk of the zircons in the rock. The widespread growth of metamorphic zircon about 60 m.y. ago is suggested to coincide with the final stages of late Cretaceous-Palaeocene metamorphism of the Omineca Belt. [T.F.]
Subjects:Absolute age; Ar/Ar; Cenozoic; Country rocks; Dates; Decollement; Denudation; Eocene; Errors; Extension; Faults; Geochronology; Gneisses; Igneous rocks; Intrusions; Metamorphic core complexes; Metamorphic rocks; Metasedimentary rocks; Monashee Complex; Nesosilicates; Normal faults; Orthosilicates; Paleocene; Paleogene; Phenocrysts; Plutonic rocks; Precambrian; Silicates; Syenites; Tertiary; U/Pb; Zircon; Zircon group; British Columbia; Canada; North America; Omineca Belt; Western Canada; Mount Copeland; Southeastern British Columbia
Abstract Numbers:93M/50
Record ID:1989040945
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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