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An X-ray investigation of some argillaceous rocks from the Skipton anticline, Yorkshire

Published online by Cambridge University Press:  09 July 2018

M. J. Purton  and
R. F. Youell
M. J. Purton
Affiliation:
The University of Leeds
R. F. Youell
Affiliation:
The University of Leeds
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Abstract

X-ray analyses of argillaceous rocks from the Skipton anticline show that their average composition is quartz 30%, calcite 27%, feldspar 5%, illite 15%, kaolin 17%. Pyrite and other constituents account for the remaining 6 %. The quartz, calcite and feldspar are considered to be detrital, the variations in their quantity and size reflecting changes in the source of the sediments. The evidence indicates the general predominance of kaolin over illite, which is contrary to other published results on Carboniferous marine shales. A kaolin-rich source is necessary to account for the composition of the sediments. An occurrence of unusually pure and well-crystalline melanterite is recorded from the Draughton Limestone.

Type
Research Article
Information
Clay Minerals , Volume 8 , Issue 1 , July 1969 , pp. 29 - 37
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1969

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