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Release of Mg and Fe From the Octahedral Sheets During the Transformation of Montmorillonite Into Kaolinite

Published online by Cambridge University Press:  01 January 2024

Shangying Li
Affiliation:
Key Laboratory of Mineralogy and Metallogeny, Chinese Academy of Sciences & Guangdong Provincial Key Laboratory of Mineral Physics and Materials, Guangzhou Institute of Geochemistry, Guangzhou, 510640, China University of Chinese Academy of Sciences, Beijing, 100049, China
Qi Tao
Affiliation:
Key Laboratory of Mineralogy and Metallogeny, Chinese Academy of Sciences & Guangdong Provincial Key Laboratory of Mineral Physics and Materials, Guangzhou Institute of Geochemistry, Guangzhou, 510640, China CAS Center for Excellence in Deep Earth Science, Guangzhou, 510640, China
Lingya Ma*
Affiliation:
Key Laboratory of Mineralogy and Metallogeny, Chinese Academy of Sciences & Guangdong Provincial Key Laboratory of Mineral Physics and Materials, Guangzhou Institute of Geochemistry, Guangzhou, 510640, China CAS Center for Excellence in Deep Earth Science, Guangzhou, 510640, China
Chaoqun Zhang
Affiliation:
Key Laboratory of Mineralogy and Metallogeny, Chinese Academy of Sciences & Guangdong Provincial Key Laboratory of Mineral Physics and Materials, Guangzhou Institute of Geochemistry, Guangzhou, 510640, China University of Chinese Academy of Sciences, Beijing, 100049, China
Yixuan Yang
Affiliation:
Key Laboratory of Mineralogy and Metallogeny, Chinese Academy of Sciences & Guangdong Provincial Key Laboratory of Mineral Physics and Materials, Guangzhou Institute of Geochemistry, Guangzhou, 510640, China University of Chinese Academy of Sciences, Beijing, 100049, China
Peixin Du
Affiliation:
Division of Earth and Planetary Science & Laboratory for Space Research, The University of Hong Kong, Hong Kong, China
Jiacheng Liu
Affiliation:
Division of Earth and Planetary Science & Laboratory for Space Research, The University of Hong Kong, Hong Kong, China
Jianxi Zhu
Affiliation:
Key Laboratory of Mineralogy and Metallogeny, Chinese Academy of Sciences & Guangdong Provincial Key Laboratory of Mineral Physics and Materials, Guangzhou Institute of Geochemistry, Guangzhou, 510640, China University of Chinese Academy of Sciences, Beijing, 100049, China CAS Center for Excellence in Deep Earth Science, Guangzhou, 510640, China
*
*E-mail address of corresponding author: malingya@gig.ac.cn

Abstract

Isomorphous substitutions of Mg and Fe for Al generally appear in the octahedral sheets of montmorillonite, whereas they are infrequent in kaolinite. Therefore, the release of Mg and Fe from the octahedral sheets probably happens during the transformation of montmorillonite into kaolinite, which could affect the migration of Mg and Fe from clay minerals into surrounding environments. The objective of the current study was to investigate the relationship between Mg and Fe release during the transformation of montmorillonite into kaolinite. The results showed that the d060 value of clay minerals decreased slightly, and the intensities of both the AlMg–OH and AlFe–OH bending vibrations also decreased gradually. In addition, the (Mg+Fe)/Al (major octahedral ions) atomic ratio of kaolinite was lower than that of montmorillonite, especially in identical hydrothermal products. These results indicated that Mg and Fe ions were released progressively from the octahedral sheets during the transformation of montmorillonite into kaolinite. Moreover, the changed relative concentrations of Mg and Fe ions in the supernatant solutions after hydrothermal reactions suggested a random distribution of Mg and/or Fe in the octahedral sheets of the montmorillonite. These results improve understanding of the release relationship between Mg and Fe during clay mineral evolution and of the distribution of these two ions in the octahedral sheets, as well as the chemical composition of clay minerals as an indicator of geological environments.

Type
Article
Copyright
Copyright © Clay Minerals Society 2021

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