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Redox-controlled selenide mineralization in the Upper Old Red Sandstone

Samuel C. Spinks, John Parnell and John W. Still
Redox-controlled selenide mineralization in the Upper Old Red Sandstone
Scottish Journal of Geology (October 2014) 50 (2): 173-182


Selenium concentrations occur in organic-rich lithologies such as coal, and as secondary accumulations from the oxidative mobilization, migration and subsequent concentration upon encountering reductants such as organic matter or H (sub 2) S. Here we assess the redox mineralization of copper and lead selenide phases in the cores of reduction spheroids in Devonian sedimentary red beds. We propose that the selenide mineralization occurred as descending meteoric fluids, supplied with selenium from Carboniferous coal seams, migrated through a major fault plane into underlying sandstones where localized, microbially-induced reducing conditions prevailed. These findings and other occurrences of selenide mineralization between Devonian and Carboniferous strata on the British Isles suggest a widespread selenide mineralization system between strata of that age.

ISSN: 0036-9276
EISSN: 2041-4951
Serial Title: Scottish Journal of Geology
Serial Volume: 50
Serial Issue: 2
Title: Redox-controlled selenide mineralization in the Upper Old Red Sandstone
Affiliation: University of Aberdeen, Department of Geology and Petroleum Geology, Aberdeen, United Kingdom
Pages: 173-182
Published: 201410
Text Language: English
Publisher: Geological Society Publishing House for the Geological Societies of Edinburgh and Glasgow, Bath, United Kingdom
References: 58
Accession Number: 2014-105158
Categories: Geochemistry of rocks, soils, and sedimentsSedimentary petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. strat. col., 1 table, geol. sketch maps
N55°46'00" - N55°46'00", W04°57'00" - W04°57'00"
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 201452
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