Petrology and geochemistry of late Precambrian mafic dyke swarms in Southwestern Sinai, Egypt
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 porphyri...
Elmentve itt :
| Szerző: | |
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| Dokumentumtípus: | Cikk |
| Megjelent: |
University of Szeged, Department of Mineralogy, Geochemistry and Petrology
Szeged
1993
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| Sorozat: | Acta mineralogica-petrographica
34 |
| Kulcsszavak: | Kőzettan, Ásványtan, Földtan, Geokémia |
| Tárgyszavak: | |
| Online Access: | http://acta.bibl.u-szeged.hu/24810 |
| Tartalmi kivonat: | 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. |
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| Terjedelem/Fizikai jellemzők: | 61-69 |
| ISSN: | 0365-8066 |