Geochemistry of some gabbros from Muhammad Qol area, Northern Red Sea Hills, Sudan Republic
The Muhammad Qol gabbros can be classified as 3 main rock units comprising olivine pyroxene gabbros, pyroxene gabbros and hornblende pyroxene gabbros. The modal and normative minerals together with the chemical data show that the three rock types were formed during a limited fractionation process in...
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| Dokumentumtípus: | Cikk |
| Megjelent: |
University of Szeged, Department of Mineralogy, Geochemistry and Petrology
Szeged
1980
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| Sorozat: | Acta mineralogica-petrographica
24 No. 2 |
| Kulcsszavak: | Kőzettan, Ásványtan, Földtan, Geokémia |
| Tárgyszavak: | |
| Online Access: | http://acta.bibl.u-szeged.hu/24659 |
| Tartalmi kivonat: | The Muhammad Qol gabbros can be classified as 3 main rock units comprising olivine pyroxene gabbros, pyroxene gabbros and hornblende pyroxene gabbros. The modal and normative minerals together with the chemical data show that the three rock types were formed during a limited fractionation process in which a type of regular gradation in the chemical composition of the magma had taken place. The early fractionation stage was characterized by a pronounced mafic liquidus phase from which gabbros bearing much olivine and pyroxene with little plagioclase were formed under high temperature. With progressive fractionation, the crystallized plagioclases became more abundant than the mafic minerals which comprise pyroxene and little olivine crystals. At late fractionation stage, the hydrous minerals began to crystallize under high water pressure and relatively low temperature producing hornblende pyroxene gabbros. The strong alteration in some gabbroic rocks shows that they were affected greatly by late magmatic hydrothermal solutions. As a result, some major and trace elements in the mafic and felsic minerals had been redistributed during uralitization, chloritization and sericitization processes. |
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| Terjedelem/Fizikai jellemzők: | 271-281 |
| ISSN: | 0365-8066 |