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Jurassic clay mineral assemblages and their post-depositional alteration: upper Great Estuarine Group, Scotland

Published online by Cambridge University Press:  01 May 2009

Julian E. Andrews
Julian E. Andrews
Affiliation:
Department of Geology, Leicester University, University Road, Leicester LEI 7RH, U.K.
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Abstract

Clay minerals from Middle Jurassic lagoonal mudrocks, siltstones and silty fine-grained sandstones of the upper Great Estuarine Group (Bathonian) are divided into four assemblages. Assemblage 1, the most common assemblage, is rich in mixed-layer illite–smectite with attendant illite and kaolinite. Assemblage 2 is dominated by smectitic clay. These assemblages are indicative of primary Jurassic deposition. Illite and kaolinite were probably derived from the weathering of older rocks and soils in the basin hinterland and were deposited in the lagoons as river-borne detritus. The majority of smectite and mixed-layer illite–smectite is interpreted as the argillization product of Jurassic volcanic dust, also deposited in the lagoons by rivers. Near major Tertiary igneous intrusions these depositional clay mineral assemblages have been altered. Assemblage 3 contains smectite-poor mixed-layer illite–smectite, whilst Assemblage 4 contains no smectitic clay at all. Destruction of smectite interlayers occurred at relatively shallow burial depths (< 2500 m) due to enhanced geothermal gradients and local convective hot-water circulation cells associated with the major Tertiary igneous intrusions.

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Articles
Information
Geological Magazine , Volume 124 , Issue 3 , May 1987 , pp. 261 - 271
Copyright
Copyright © Cambridge University Press 1987

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