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Relative coherent stacking potential of fundamental particles of illite-smectite and its relationship to geological environment

Published online by Cambridge University Press:  09 July 2018

Il-Mo Kang ,
S. Hillier ,
Yungoo Song  and
In-Joon Kim
Il-Mo Kang
Affiliation:
Korea Institute of Geoscience and Mineral Resources, 124 Gwahang-no, Yuseong-gu, Daejeon, 305-350, Korea
S. Hillier
Affiliation:
The James Hutton Institute, Craigiebuckler, Aberdeen AB15 8QH, Scotland, UK
Yungoo Song*
Affiliation:
Department of Earth System Sciences, Yonsei University, 134, Shinchon-dong, Seodaemun-ku, Seoul, 120-749, Korea
In-Joon Kim
Affiliation:
Korea Institute of Geoscience and Mineral Resources, 124 Gwahang-no, Yuseong-gu, Daejeon, 305-350, Korea
*
*E-mail: [email protected]
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Abstract

Interstratified illite-smectite (I-S) occurring authigenically in diverse earth crust environments reacts toward more illite-rich phases as temperature increases. For that reason, I-S is used for geothermometry when prospecting for hydrocarbons or ore mineral deposits. This study develops the mathematical relations for characterizing the coherent stacking potential of fundamental particles (FP) using the expandability ratio K, where K is defined as (%SMAX –; %SXRD)/%SMAX. The ratio can be applied to differentiating I-S samples from shales, bentonites, and hydrothermal alterations. In particular, patterns on a K vs. T diagram, where T is the average thickness of fundamental particles (FPs), appear to be indicative of the geological conditions related to I-S formation. Shale samples plot in the negative K domain of the diagram, possibly due to the intimate mixing of detrital particles. Both bentonitic and hydrothermal samples display trends of increasing K with T, which suggests the coherent stacking potential progressively decreases as FPs increase in thickness. Hydrothermal samples are more extensively distributed on the diagram than samples from bentonites. This result may reflect differences in particle growth conditions (nutrients and space) between bentonites (short supply) and hydrothermal alterations (good supply).

Keywords

mixed-layerillite-smectiteI-Sfundamental particlesMacEwan crystallitesexpandabilitycoherent stackingparticle growth
Type
Research Papers
Information
Clay Minerals , Volume 47 , Issue 3 , September 2012 , pp. 319 - 327
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2012

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