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Sideritic concretions from the Westphalian of Yorkshire: a chemical investigation of the carbonate phase

Published online by Cambridge University Press:  05 July 2018

M. J. Pearson
M. J. Pearson*
Affiliation:
Department of Geology and Mineralogy, The University, Marischal College, Aberdeen, AB9 IAS
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Summary

The carbonate phase of impure sideritic concretions from a sequence of argillaceous sediments from the Westphalian of Yorkshire has been analysed using an acid-dissolution technique and corrections allowing for the decomposition of non-carbonate minerals applied to obtain accurate compositional formulae.

The siderites show considerable compositional variation, some containing Ca in excess of anticipated substitutional limits. Whilst these may be metastable it is suggested that coupled Mg-Ca substitution could provide an explanation.

Type
Research Article
Information
Mineralogical Magazine , Volume 39 , Issue 306 , June 1974 , pp. 696 - 699
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1974

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