Diagenetic chlorite formation in some Mesozoic shales from the Sleipner area of the North Sea

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Authors:Hurst, A.
Author Affiliations:Primary:
Statoil, Stavanger, Norway
Volume Title:Clay Minerals
Source:Clay Minerals, 20(1), p.69-79. Publisher: Mineralogical Society, London, United Kingdom. ISSN: 0009-8558
Publication Date:1985
Note:In English. 19 refs.; illus. incl. strat. cols., sketch maps
Summary:Diagenetic chlorite is forming as a result of temperature-controlled burial diagenesis in shales from the Sleipner area of the North Sea. Accompanying chlorite diagenesis, kaolinite and illite-smectite decrease in abundance, and illite increases in abundance. These clay mineral transformations occur between 122-126°C at temperatures higher than normally expected for chlorite diagenesis. Kaolinite and ordered illite-smectite are largely unaffected by diagenesis below 100°C. It is proposed that chlorite diagenesis is thus delayed due to the absence of a source of ions resulting from smectite decomposition. Clay mineralogy is of no lithostratigraphic use in the Jurassic sediments of the Sleipner area. However, the zone of chlorite diagenesis is a reliable indicator of maximum burial temperature. [D.J.M.]
Subjects:Bajocian; Brent Group; Burial metamorphism; Chlorite; Chlorite group; Clastic rocks; Clay mineralogy; Clay minerals; Diagenesis; Genesis; Illite; Ions; Jurassic; Kaolinite; Materials; Mesozoic; Metamorphism; Middle Jurassic; Mineral composition; Mineral data; Mixed-layer minerals; Order-disorder; Sedimentary petrology; Sedimentary rocks; Shale; Sheet silicates; Silicates; Smectite; Temperature; X-ray data; Atlantic Ocean; North Atlantic; North Sea; Humber Group; Sleipner
Abstract Numbers:85M/2298
Record ID:1985057854
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland
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