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Magnesian siderite in carbonate concretions from argillaceous sediments in the Westphalian of Yorkshire

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

Lattice parameters have been determined for two coexisting siderite phases in concretions of Westphalian age. Chemical evidence indicates that, for one concretion at least, the phase of smaller cell dimensions is a magnesian siderite with around 25 mole % MgCO3. Both abundances and compositions of the two phases vary between concretions whilst a single phase only is present in disseminated siderite. It is thought unlikely that the two phases represent an equilibrium assemblage and a mechanism is suggested by which magnesian siderite could have formed later.

Type
Research Article
Information
Mineralogical Magazine , Volume 39 , Issue 306 , June 1974 , pp. 700 - 704
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1974

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References

Oertel, (G.) and Curtis, (C. D.), 1972. Geol. Soc. Amer. Bull., 83, 2597.CrossRefGoogle Scholar
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