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Alkylammonium characterization of smectite alteration in the Tertiary basins of southeast Korea

Published online by Cambridge University Press:  09 July 2018

J. Ko ,
G. H. Lee ,
H.-S. Moon  and
Y. Song
J. Ko
Affiliation:
Department of Earth System Sciences, Yonsei University, Seoul 120-749, Korea
G. H. Lee
Affiliation:
Department of Earth System Sciences, Yonsei University, Seoul 120-749, Korea
H.-S. Moon
Affiliation:
Department of Earth System Sciences, Yonsei University, Seoul 120-749, Korea
Y. Song
Affiliation:
Department of Earth System Sciences, Yonsei University, Seoul 120-749, Korea
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Abstract

The layer charge characteristics of smectite from the Tertiary basins in the Pohang area, Korea have been studied in detail using the alkylammonium method. On the basis of layer charges, the smectite in the Pohang area can be classed as normal and high-charge (hc) smectite. The layer charge of the normal smectite averages 0.3, and ranges from 0.25 to 0.38/half unit-cell. The hcsmectite collapses on K saturation to become illite-like material and shows 10 Åseries reflections on X-ray diffraction. The layer charge of the hc-smectite ranges from 0.5 to 1. The layer charges do not appear to be related to stratification or to basins of occurrence. The diagenetic trend that may have existed in the region was probably disturbed by later volcanic activity. A systematic change in layer charge and geochemistry of smectite in Waeup illustrates that the heat and solutions associated with the volcanic activity may have played a role in the development of layer charge.

Type
Research Article
Information
Clay Minerals , Volume 33 , Issue 2 , June 1998 , pp. 243 - 254
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1998

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