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Mixed-layer illite-smectite in low-temperature diagenesis: data from the Miocene of the Carpathian Foredeep

Published online by Cambridge University Press:  09 July 2018

J. Środoń*
Affiliation:
Polish Academy of Sciences, Institute of Geological Sciences, 31-002 Krakow, Senacka 3, Poland

Abstract

Bulk mineralogy, clay fraction mineralogy and layer ratio in interstratified illite-smectite were studied in three Upper Miocene profiles, up to 200 m deep and representing very low sedimentation rates (∼80 mm/103 yr) with environments of sedimentation ranging from hypersaline (gypsum deposits) to brackish. No correlation was found between mineralogy and depth, or between mineralogy and chemical environment of deposition, despite the use of precise identification techniques. It is concluded that smectites and interstratified illite-smectites are stable in marine sediments until the elevated temperatures of deep diagenesis are reached.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1984

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