1978•Clays and Clay MineralsRequires access

Reaction Series for Dioctahedral Smectites

Dennis D. Eberl

Abstract

Abstract Several dioctahedral clay minerals are related through reaction series. These series can be produced hydro-thermally from beidellite gel and montmorillonite by making simple changes in interlayer and solution chemistry. The series are: gel-K-beidellite-random illite/smectite-K-rectorite-illite K-montmorillonite-K-rectorite-illite Na-montmorillonite or beidellite-Na-rectorite-paragonite Li-montmorillonite-Li-tosudite-Li-rectorite-cookeite(?) Mg-montmorillonite-Mg-rectorite-tosudite-sudoite(?) Ca-montmorillonite-Ca-rectorite-margarite(?) Al-Ca-montmorillonite-kaolinite/smectite-kaolinite (150°C) Al-Ca-montmorillonite-pyrophyllite/smectite-pyrophyllite (320°C). Assuming stability for the mixed-layer phases, paragenesis is a function of P, T, and X conditions. If the phases are considered to be metastable, paragenesis is a function of the speed and path of reaction.

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Key concepts: Paragenesis, Montmorillonite, Biogeosciences, Clay minerals, Metastability, Series (stratigraphy), Mineralogy, Geology