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American Mineralogist

Journal of Earth and Planetary Materials

Ed. by Baker, Don / Xu, Hongwu / Swainson, Ian

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Volume 101, Issue 1


K-bentonites: A review

Warren D. Huff
Published Online: 2016-01-09 | DOI: https://doi.org/10.2138/am-2016-5339


Pyroclastic material in the form of altered volcanic ash or tephra has been reported and described from one or more stratigraphic units from the Proterozoic to the Tertiary. This altered tephra, variously called bentonite or K-bentonite or tonstein depending on the degree of alteration and chemical composition, is often linked to large explosive volcanic eruptions that have occurred repeatedly in the past. K-bentonite and bentonite layers are the key components of a larger group of altered tephras that are useful for stratigraphic correlation and for interpreting the geodynamic evolution of our planet. Bentonites generally form by diagenetic or hydrothermal alteration under the influence of fluids with high-Mg content and that leach alkali elements. Smectite composition is partly controlled by parent rock chemistry. Studies have shown that K-bentonites often display variations in layer charge and mixed-layer clay ratios and that these correlate with physical properties and diagenetic history. The following is a review of known K-bentonite and related occurrences of altered tephra throughout the timescale from Precambrian to Cenozoic.

Keywords: K-bentonite; bentonite; tephra; explosive volcanism; volcanic ash; Review article

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About the article

Received: 2015-03-01

Accepted: 2015-06-23

Published Online: 2016-01-09

Published in Print: 2016-01-01

Manuscript handled by Richard April.

Citation Information: American Mineralogist, Volume 101, Issue 1, Pages 43–70, ISSN (Online) 1945-3027, ISSN (Print) 0003-004X, DOI: https://doi.org/10.2138/am-2016-5339.

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© 2016 by Walter de Gruyter Berlin/Boston.

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