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A Mixed-Layer Clay Mineral Associated with an Evaporite

Published online by Cambridge University Press:  01 January 2024

R. E. Grim ,
John B. Droste  and
W. F. Bradley
R. E. Grim
Affiliation:
University of Illinois, Urbana, Illinois, USA
John B. Droste
Affiliation:
Indiana University, Bloomington, Indiana, USA
W. F. Bradley
Affiliation:
Illinois Geological Survey, Urbana, Illinois, USA
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Abstract

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Clay partings in the ore beds in a New Mexico evaporite section include a range of mixed-layer clay mineral sequences of the corrensite type. Specimens range from nearly regular alternations to sequences which depart from regularity to moderate degrees. The ore bodies consist of halite, polyhalite, sylvite, magnesite, dolomite, carnallite, and iron oxides.

Observed x-ray diffraction effects from representative specimens are compared with synthesized effects for montmorillonite- or vermiculite-chlorite layer sequences.

It is concluded that the segregation of the abundant Mg interlayer content into specific, regularly spaced interlayers represents the equilibrium relationship between a montmorillonite-chlorite or vermiculite-chlorite mixed assemblage and a mildly acid, Mg2+-, Na+- and K+-rich environment.

Type
Article
Information
Clays and Clay Minerals (National Conference on Clays and Clay Minerals) , Volume 8 , February 1959 , pp. 228 - 236
Copyright
Copyright © The Clay Minerals Society 1959

References

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