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Formation of illitic minerals at surface temperatures in Purbeckian sediments (Lower Berriasian, Swiss and French Jura)

Published online by Cambridge University Press:  09 July 2018

J. F. Deconinck ,
A. Strasser  and
P. Debrabant
J. F. Deconinck
Affiliation:
Laboratoire de Dynamique Sédimentaire et Structurale et U. A. 719 C.N.R.S., U.F.R. des Sciences de la Terre, Université de Lille 1, 59655 Villeneuve d'Ascq Cedex, France
A. Strasser
Affiliation:
Département de Géologie et de Paléontologie, Universié de Genève, 13 rue des Maraîchers, 1211 Genève 4, Switzerland
P. Debrabant
Affiliation:
Laboratoire de Dynamique Sédimentaire et Structurale et U. A. 719 C.N.R.S., U.F.R. des Sciences de la Terre, Université de Lille 1, 59655 Villeneuve d'Ascq Cedex, France
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Abstract

The clay-mineralogical assemblages of Purbeckian carbonate sediments of the Swiss and French Jura Mountains are often composed of illite and interstratified illite-smectite. These illitic minerals occur mainly in thin layers of green marls which show evidence of subaerial exposure and mark the top of shallowing-upward sequences. X-ray diffraction, chemical and thermal analyses coupled with transmission electron microscopy suggest that the Purbeckian illitic minerals replaced smectite in intermediate continental-marine environments. The transition from smectite to illite and interstratified illite-smectite probably resulted from repeated cycles of wetting by marine waters and subsequent drying in hypersaline environments, under a hot Purbeckian climate.

Type
Research Article
Information
Clay Minerals , Volume 23 , Issue 1 , March 1988 , pp. 91 - 103
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1988

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