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Contact metasomatism in a Neogene evaporitic sequence of the central Jordan Valley—northern Israel

Published online by Cambridge University Press:  05 July 2018

A. Nissenbaum ,
Y. Nathan  and
E. Sass
A. Nissenbaum
Affiliation:
Isotope Department, Weizmann Institute of Science, Rehovot, Israel
Y. Nathan
Affiliation:
Geochemistry Division, Geological Survey of Israel, Jerusalem, Israel
E. Sass
Affiliation:
Department of Geology, Hebrew University, Jerusalem, Israel
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Summary

Gypsum and anhydrite from the Neogene of the central Jordan valley associated with basalt bodies in the Menahamiya area contain abundant euhedral magnetite and diopside crystals and rarer grossular. The original calcareous shales above the gypsum were transformed into hydrogrossular cemented by secondary calcite and gypsum. The mineralization is assumed to be due to low-temperature, high water-pressure metasomatic activity similar to the process of rodingization. The described occurrence is unusual in that the hydrothermal solutions may have been partly formed in situ by thermal dehydration of the gypsum. In a nearby locality, Tel Shaharit, the mineralization occurred in a calcareous environment producing thomsonite, natrolite, and hydrogrossular.

Type
Research Article
Information
Mineralogical Magazine , Volume 41 , Issue 318 , June 1977 , pp. 233 - 238
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1977

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