The Eh-pH environment of deposition of some sedimentary deposits from Egypt

El Sokkary A. A.: The Eh-pH environment of deposition of some sedimentary deposits from Egypt. In: Acta mineralogica-petrographica, (32). pp. 37-41. (1991)

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Abstract

Thirty four samples representing four types of sedimentary rocks from Egypt are subjected to laboratory determination of Eh-pH values in order to determine their environment of deposition. The rock types under study are: (1) The Fe-Mn deposits associating Carboniferous rocks of West Central Sinai (2) Shales and clays usually covering the mentioned Fe-Mn ores of West Central Sinai (3) Phosphatic rocks from different localities in Egypt (4) Oligocene shales and clays from Gebel Qatrani in the Western Desert. The environment of deposition of the Fe-Mn deposits of West Central Sinai is shown here to be shallow marine waters. Most of the shales and clays associating the Fe-Mn deposits of West Central Sinai have pHs indicating that their depositional environment is marine like the precipitating medium of the Fe-Mn ores. The few samples of these shales and clays that show pHs on the acidic side represent rocks subjected to bleaching effects by later acidic solutions. Phosphatic sediments from different localities of the country have their pHs indicating typical marine environment of deposition. Oligocene shales ana clays of Gebel Quatrani in the Western Desert have pHs that range between acidic and alkaline media of deposition reflecting the fluviomarine origin of tnese sediments.

Item Type: Article
Journal or Publication Title: Acta mineralogica-petrographica
Date: 1991
Volume: 32
ISSN: 0365-8066
Page Range: pp. 37-41
Language: English
Publisher: University of Szeged, Department of Mineralogy, Geochemistry and Petrology
Place of Publication: Szeged
Related URLs: http://acta.bibl.u-szeged.hu/39410/
Uncontrolled Keywords: Kőzettan, Ásványtan, Földtan
Additional Information: Bibliogr.: 41. p. ; összefoglalás angol nyelven
Subjects: 01. Natural sciences
01. Natural sciences > 01.05. Earth and related environmental sciences
Date Deposited: 2016. Oct. 17. 09:25
Last Modified: 2022. Jul. 27. 08:04
URI: http://acta.bibl.u-szeged.hu/id/eprint/24790

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