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Isotopic (K-Ar and oxygen) constraints on the extent and importance of the Liassic hydrothermal activity in western Europe

Published online by Cambridge University Press:  09 July 2018

N. Clauer ,
H. Zwingmann  and
S. Chaudhuri
N. Clauer
Affiliation:
Centre de Géochimie de la Surface (CNRS), 67084 Strasbourg, France
H. Zwingmann
Affiliation:
Centre de Géochimie de la Surface (CNRS), 67084 Strasbourg, France
S. Chaudhuri
Affiliation:
Department of Geology, Kansas State University, Manhattan, 66506 Kansas, USA
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Abstract

The K-Ar dates and oxygen isotope data of illite-to-mica mineral phases in Permian to Triassic sandstones from Germany and Libya have been compared to previously published results of similar minerals of Liassic ages taken from lithologically similar rocks in several sites in western Europe and northern Africa. The widespread Liassic age for the micaceous mineral phases can be related to abnormal heat pulses induced by pre-rifting conditions. The temperatures in most cases appeared to be in the 150–220°C range. Some of these hydrothermal activities were responsible for both gas generation and U and Pb-Zn concentrations.

An approach combining K-Ar isotope dates and oxygen isotope signatures provides a framework for the characterization of the clay separates used in isotopic investigations and for depicting any crystallization conditions. The trend in decreases in δ18O values relative to increases in K-Ar dates, while the size of the clay fractions in a single sample increases, is indicative of detrital contamination. Varied trends in the δ18O values at constant K-Ar dates for clay fractions with increase in size might be indicative of changes in the pore volume of the host rocks.

Type
Research Article
Information
Clay Minerals , Volume 31 , Issue 3 , September 1996 , pp. 301 - 318
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1996

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