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K-Ar dating of illite fundamental particles separated from illite-smectite

Published online by Cambridge University Press:  09 July 2018

N. Clauer ,
J. Środoń ,
J. Francu  and
V. Šucha
N. Clauer
Affiliation:
Centre de Géochimie de la Surface (CNRS), 1 rue Blessig, 67084-Strasbourg, France
J. Środoń
Affiliation:
Institute of Geological Sciences, Polish Academy of Sciences, Senacka 1, 31-002 Krakow, Poland
J. Francu
Affiliation:
Geological Survey, Leitnerova 22, 658 69 Brno, Czech Republic
V. Šucha
Affiliation:
Department of Geology of Mineral Deposits, Comenius University, Mlynska dolina, pav. G, 842 15 Bratislava, Slovakia
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Abstract

Fundamental particles of illite-smectite from bentonites were separated into classes by high-speed centrifugation after infinite osmotic swelling of mixed-layer crystals, achieved by Na-exchange and dispersion in distilled water. In samples free of detrital contamination, the thinnest fundamental particles yield older K-Ar ages than the thicker fundamental particles. This implies that they do not preferentially lose radiogenic 40Ar due to size, and that the illitization process is a crystal growth mechanism (not nucleation plus growth). As a result, any K-Ar age of fundamental illite particles from bentonites is an integral over longer or shorter periods of time, depending on the thermal history of the rocks. In thick bentonite beds, the measured age difference between the beginning of the illitization process at the contact with the host rocks and the end in the centre of the bed records extremely slow K diffusion in these well compacted rocks. These data explain why measured K-Ar ages of illite-smectite from bentonites are younger than the corresponding age of shale illitization, inferred from the burial history of the basin. The finest technically separable size-fractions of associated shales (<0.02 μm) yield K-Ar dates* greater than the stratigraphic age. This observation points to incomplete recrystallization of detrital illite during burial diagenesis.

Type
Research Article
Information
Clay Minerals , Volume 32 , Issue 2 , June 1997 , pp. 181 - 196
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1997

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