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Comparison of I/S Transformation and Maturity of Organic Matter at Elevated Temperatures

Published online by Cambridge University Press:  28 February 2024

B. Velde  and
B. Lanson
B. Velde
Affiliation:
Département de Géologie, UR 1316 CNRS, École Normale Supérieure, 24 rue Lhomond, 75213 Paris, France
B. Lanson
Affiliation:
Département de Géologie, UR 1316 CNRS, École Normale Supérieure, 24 rue Lhomond, 75213 Paris, France
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Abstract

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Comparing the state of reaction advancement of I/S (illite content of illite/smectite mixed layer minerals) and organic matter (vitrinite reflectance) in instances of high temperature gradients allows one to observe the evolution of geologic materials under extreme conditions. In a geothermally heated sedimentary series (Salton Sea area, California), both clays and organics have reacted to completion in the temperature gradient range of 200°-400oC/km during heating episodes of 104 years. We observed an instance of rapid heating, through magmatic intrusion into the Meso-Paleozoic eastern Paris Basin sedimentary series in late Permian time, which induced changes in the organic material, but where clays are apparently unaffected.

Keywords

Illite/smectiteKineticsVitrinite maturity
Type
Research Article
Information
Clays and Clay Minerals , Volume 41 , Issue 2 , April 1993 , pp. 178 - 183
Copyright
Copyright © 1993, The Clay Minerals Society

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