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The AAPG/Datapages Combined Publications Database
CSPG Bulletin
Abstract
Abstracts of Theses: Cambrian (Pre-Beekmantown) Sedimentation in S.W. Quebec With Special Reference to Three Deep Wells Near Montreal
Study of Potsdam sandstones from southwestern Quebec confirms their division into a lower feldspathic Covey Hill Formation and an upper Chateauguay Formation, subdivided into an orthoquartzitic Cairnside Member and an upper carbonate-rich Theresa Member. Roundness of grains and stability of heavy minerals suggest that sands were mature and underwent extensive predepositional abrasion in a semi-arid to temperate climate. Textural inversions, omnipresent sorted laminations, and sedimentary structures indicate shallow shelf deposition with variable energy conditions imparted predominantly by strong tides.
Diagenetic reorganization of detrital clays in Covey Hill beds produced and illite-chlorite-sericite assemblage and later, large chlorite and muscovite flakes. Overgrowths of quartz and feldspar are ubiquitous; some chertification of clays occurred. Sphene developed after diagenetic alteration of ilmenite to leucoxene. Pyrite authigenesis appears related to Monteregian igneous activity. Alteration of detrital micas was general; hematitic flakes colour portions of the Covey Hill Formation. Important pressure solution modified original grain roundness.
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ACKNOWLEDGMENTS AND ASSOCIATED FOOTNOTES
1965, McGill University, Ph.D.
Copyright © 2004 by The Society of Canadian Petroleum Geologists. All Rights Reserved.
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