Petrology and geochemistry of late Precambrian mafic dyke swarms in Southwestern Sinai, Egypt

Abdel-Karim Abdel-Aal Mohamed: Petrology and geochemistry of late Precambrian mafic dyke swarms in Southwestern Sinai, Egypt. In: Acta mineralogica-petrographica, (34). pp. 61-69. (1993)

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Abstract

The dyke swarms in southwestern Sinai consist of mafic (old) and felsic (young) suites. The mafic one is studied in terms of field, petrography and geochemistry. The mafic suite ranges in composition from basalt to quartz latite with 49—69 % SK>2 and 1—4.5 % K2O. They consist of dominant porphyritic basalt, pyroxene and hornblende andesite and hornblende quartz latite and minor plagiophvre and lamprophyre. Poiphyritic varieties contain phenocrysts of plagioclase and amphibole ana/or clinopyroxene. The eruption of these dyke swarms have been invaded directly before or contemporaneously with the emplacement of a late Precambrian pink granites. Chemically, these volcanics are K-rich calc-alkaline series, largely peraluminous to metaaluminous nature. They are almost derived from continental crust slightly contaminated by upper mantle materials in orogenic belt. The tectonic setting reveals a mineralogic and chemical similarity with the island arc rather than the continental margin.

Item Type: Article
Journal or Publication Title: Acta mineralogica-petrographica
Date: 1993
Volume: 34
ISSN: 0365-8066
Page Range: pp. 61-69
Language: English
Publisher: University of Szeged, Department of Mineralogy, Geochemistry and Petrology
Place of Publication: Szeged
Related URLs: http://acta.bibl.u-szeged.hu/39412/
Uncontrolled Keywords: Kőzettan, Ásványtan, Földtan, Geokémia
Additional Information: Bibliogr.: p. 68-69. ; ill. ; 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. 09:48
URI: http://acta.bibl.u-szeged.hu/id/eprint/24810

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