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Kaolinization of 2:1 Type Clay Minerals with Different Swelling Properties by Li, Shangying; He, Hongping; Tao, Qi; Zhu, Jianxi; Tan, Wei; Ji, Shichao; Yang, Yiping; Zhang, Chaoqun is a Earth and Planetary Sciences article available to read on EtoBox.

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## Abstract Kaolinization of 2:1 type clay minerals commonly occurs in the supergene environments of the Earth, which plays critical roles in many geochemical and environmental processes. However, the transformation mechanism involved and the specific behavior of 2:1 type swelling and non-swelling clay minerals during kaolinization remain poorly understood. In this study, laboratory experiments on the kaolinization of montmorillonite (swelling), illite (non-swelling), and rectorite (partially swelling) were carried out to investigate the kaolinization mechanism of 2:1 type clay minerals and to evaluate whether swelling and non-swelling layers of 2:1 type clay minerals perform differently or not in their kaolinization processes. The results show that montmorillonite, illite, and rectorite in acidic Al3+-containing solutions can be transformed into kaolinite, whereas such transformation is hard to take place in Al3+-free solutions. Part of the Al3+ in the solutions was exchanged into the interlayer spaces of swelling clay minerals at the early stage and resulted in the formation of hydroxy-aluminosilicate (HAS) interlayers, but they show no influence on the transformation process. In

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Author

Li, Shangying; He, Hongping; Tao, Qi; Zhu, Jianxi; Tan, Wei; Ji, Shichao; Yang, Yiping; Zhang, Chaoqun

Publisher

Mineralogical Society of America; Walter de Gruyter GmbH (ISSN 0003-004X)

Published

2020

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)