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Microstructures in Cenomanian glauconite from the Isle of Wight, England

Published online by Cambridge University Press:  05 July 2018

Herman H. Zumpe
Herman H. Zumpe*
Affiliation:
Department of Geology, Chelsea College (University of London), London, S.W. 3
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Summary

Cenomanian glauconite grains from the Isle of Wight often possess a thin, pale green shell or ‘corona’ of glauconite. Optical investigation led to recognition of two types of microstructure in these shells; an outer layer with tangentially orientated c-axes, and an inner isotropic layer. A third type of layer with radially orientated c-axes occurs both subjacent to the corona and at lower levels in glauconite grains. This latter occurrence is frequently a relic of a former corona, and indicates two or more periods of glauconite formation. The disposition of the microstructures allows some conclusions to be drawn with respect to the depositional history of individual glauconite grains.

Type
Research Article
Information
Mineralogical Magazine , Volume 38 , Issue 294 , June 1971 , pp. 215 - 224
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2013

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