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Different rates of smectite illitization in mudstones and sandstones from the Niigata Basin, Japan

Published online by Cambridge University Press:  09 July 2018

B. Niu  and
H. Ishida
B. Niu*
Affiliation:
Geology and Geochemistry Laboratory, Technology Research Centre, Japan National Oil Corporation (JNOC), 2-2 Hamada 1 Chome Mihama-ku, Chiba 261, Japan
H. Ishida
Affiliation:
Geology and Geochemistry Laboratory, Technology Research Centre, Japan National Oil Corporation (JNOC), 2-2 Hamada 1 Chome Mihama-ku, Chiba 261, Japan
*
*E-mail: niu-ben@jnoc.go.jp
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Abstract

The different rates of smectite illitization have been investigated in interbedded sandstone and mudstone samples from the Neogene to Lower Pleistocene stratigraphy of the Niigata sedimentary basin. For samples of approximately the same age and under the same temperature and pressure conditions, the analytical results of XRD and EDS show that differences in the transformation from R = 1 I-S to R≥3 I-S at a temperature of ~30–40°C and 1000 m in depth are determined by the initial smectite composition and the relative ion concentration of pore-fluid in the sedimentary rock system. The ordered I-S and illite in the mudstone have inherited compositional characteristics from the initial detrital smectite and illite. In the sandstone, the I-S composition was changed by interaction with pore-fluids and by precipitation and crystal growth during diagenesis.

Keywords

smectite illitizationNiigata BasinJapan
Type
Research Article
Information
Clay Minerals , Volume 35 , Issue 1 , March 2000 , pp. 163 - 173
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2000

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