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GEOREF RECORD

Petrography of sulphide-coated grains from the Ordovician Winnipeg Formation, Saskatchewan, Canada

Pier L. Binda and E. L. Simpson
Petrography of sulphide-coated grains from the Ordovician Winnipeg Formation, Saskatchewan, Canada
European Journal of Mineralogy (June 1989) 1 (3): 439-453

Abstract

Various types of sulphide-coated grains are described from core samples in clay-rich sandstones in the Winnipeg formation. Similar sulphide-coated grains are peculiarly common in Ordovician siliciclastic rocks elsewhere in Canada. Eight types have been distinguished in polished thin-section: 1) marcasite-pyrite ooids and pisoids; 2) quartz-replacement ooids; 3) coated fossil fragments; 4) ooids with Ti-rich nucleus; 5) chalcopyrite-pyrite ooids; 6) ooids with pyrite nucleus; 7) reworked ooids; 8) ooids without recognizable nucleus. These 0.3-4.0 mm grains form diagenetically by the accretion of an Fe-sulphide cortex around spherulitic marcasite aggregates, around chalcopyrite-pyrite intergrowths, or around detrital ilmenite or sulphide grains. No replacement of previously-formed ooids has been observed. Accretion of the cortex took place during early diagenesis, probably within 2 m of the water/sediment interface; the diagenetic environment was anoxic sulphidic. The process may have a bearing on metallogenic models for stratiform sulphide deposits.


ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 1
Serial Issue: 3
Title: Petrography of sulphide-coated grains from the Ordovician Winnipeg Formation, Saskatchewan, Canada
Affiliation: Univ. Regina, Geol. Dep., Regina, SK, Canada
Pages: 439-453
Published: 198906
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 37
Accession Number: 1993-015415
Categories: Sedimentary petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. strat. col., 1 table, geol. sketch maps
N49°00'00" - N60°00'00", W110°00'00" - W101°19'60"
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom. Reference includes data from Geoline, Bundesanstalt fur Geowissenschaften und Rohstoffe, Hanover, Germany
Update Code: 1993
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