Sulphides with high δ34S from the late Precambrian Bonahaven Dolomite, Argyll, Scotland

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Authors:Hall, A. J.; McConville, P.; Boyce, A. J.; Fallick, A. E.
Author Affiliations:Primary:
University of Glasgow, Department of Geology and Applied Geology, Glasgow, United Kingdom
Other:
Scottish Universities Research and Reactor Centre, United Kingdom
Volume Title:Mineralogical Magazine
Source:Mineralogical Magazine, 58( 3(392)), p.486-490. Publisher: Mineralogical Society, London, United Kingdom. ISSN: 0026-461X
Publication Date:1994
Note:In English. 15 refs.; 2 tables
Summary:This approx 300 m thick formation occurs immediately above the Port Askaig tillite on the NE coast of Islay. Sulphur isotope analyses of pyrite from the dolomites gave values for delta 34S of +36.5 to +42.1 per mille, indicating that this pyrite is exceptionally enriched in the heavier 34S, compared to typical delta 34S values of approx +15 per mille for Appin and Argyll group sulphides. The preferred interpretation of this isotopically heavier sulphur is that it is derived from the reduction of evaporitic sulphate during regional metamorphism, the coarse sulphide having inherited the sulphur isotopic signature of the original sea-water sulphate. [R.A.H.]
Subjects:Calcite; Carbonates; Dalradian; Facies; Framework silicates; Greenschist facies; Isotope ratios; Isotopes; Metamorphic rocks; Metasedimentary rocks; Precambrian; Quartz; S-34/S-32; Silica minerals; Silicates; Stable isotopes; Sulfur; Upper Precambrian; Argyllshire Scotland; Europe; Great Britain; Hebrides; Inner Hebrides; Islay; Scotland; United Kingdom; Western Europe; Bonahaven Dolomite; Strathclyde region Scotland
Abstract Numbers:94M/4538
Record ID:1995007265
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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