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K-Ar dating of varied microtextural illite in Permian gas reservoirs, northern Germany

Published online by Cambridge University Press:  09 July 2018

N. Liewig  and
N. Clauer
N. Liewig*
Affiliation:
Centre de Géochimie de la Surface (CNRS - ULP), 1 rue Blessig, 67084 Strasbourg, France
N. Clauer
Affiliation:
Centre de Géochimie de la Surface (CNRS - ULP), 1 rue Blessig, 67084 Strasbourg, France
*
*E-mail: nliewig@illite.u-strasbg.fr
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Abstract

Several types of authigenic illite differing in their distribution and morphology are described in Rotliegend (Permian) gas-bearing sandstones of northern Germany. The microtextural environment seems to control the K-Ar age variations of illite-fractions of different sizes. Thin, uncompacted, and radial coatings are 200 Ma old, whereas uncompacted fibrous laths filling enlarged secondary porosity are 180 Ma old, and compacted or recrystallized tangential particles yield intermediate or even younger ages. Such Liassic ages relate to a thermal event, the effects of which on the clay material have not been erased subsequently, despite present-day burial depth of 4500 m and temperatures of 150°C.

Keywords

microtextural illitePermianRotliegendgas reservoirGermany
Type
Research Article
Information
Clay Minerals , Volume 35 , Issue 1 , March 2000 , pp. 271 - 281
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2000

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