Mineralogical and chemical studies on anthophyllite-actinolite schist from Wadi Um Kabu, South Eastern Desert, Egypt
The present work deals with the mineralogy and chemistry of an amphibole schist from Wadi Urn Kabu lying in the south Eastern Desert of Egypt. The detailed mineralogical investigation including optical and X-ray diffraction studies revealed this schist to be composed of anthophyllite, actinolite, go...
Elmentve itt :
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| Dokumentumtípus: | Cikk |
| Megjelent: |
University of Szeged, Department of Mineralogy, Geochemistry and Petrology
Szeged
1977
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| Sorozat: | Acta mineralogica-petrographica
23 No. 1 |
| Kulcsszavak: | Kőzettan, Ásványtan, Földtan |
| Tárgyszavak: | |
| Online Access: | http://acta.bibl.u-szeged.hu/24619 |
| Tartalmi kivonat: | The present work deals with the mineralogy and chemistry of an amphibole schist from Wadi Urn Kabu lying in the south Eastern Desert of Egypt. The detailed mineralogical investigation including optical and X-ray diffraction studies revealed this schist to be composed of anthophyllite, actinolite, goethite and calcite. Chemical analysis showed the studied schist to be enriched in MgO content (28.79%), but contains certain amounts of FeO (5.29%), CaO (5.42%) and Al2Oa (3.57%). It is concluded that the original monoclinic actinolite was transformed to orthorhombic anthophyllite during a thermal metamorphic pulse and in an atmosphere of C02 and H2 0, while the exuded Ca and Fe formed the two minerals calcite and goethite. Thus the schists of Wadi Um Kabu were the place of differential mobilization of certain elements particularly Ca and Fe during thermal metamorphism. This mostly happened under amphibolite facies of metamorphism. The studied amphibole schist sheet lying between muscovite-talc schists can be envisaged as an original basic intrusive body that was subjected later to metamorphism giving rise to the present amphibolite rock. |
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| Terjedelem/Fizikai jellemzők: | 71-76 |
| ISSN: | 0365-8066 |