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The AAPG/Datapages Combined Publications Database

Journal of Sedimentary Research (SEPM)

Abstract


Journal of Sedimentary Petrology
Vol. 39 (1969)No. 1. (March), Pages 166-175

Petrology of Previous HitSiliceousNext Hit Rocks in the Mishash Formation (Negev, Israel)

Yehoshua Kolodny

ABSTRACT

The main rock types of the Campanian Mishash Formation in Israel are: (1) homogeneous chert; (2) chert spheroids; (3) heterogeneous (breeciated) cherts; (4) porcelanites. Zones of preferred orientation were detected in the heterogeneous cherts, and two alternative models are suggested to explain both the breeciation and the formation of preferred orientation. The cherts in the Mishash formation are mostly products of early replacement of carbonate and sometimes phosphate sediments. Apatite seems more resistant to silicification than calcite. Some of the Previous HitsiliceousTop rocks (homogeneous cherts, spheroids) may have been formed by primary precipitation of silica.


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