An unusual carbonate mineral from the schists of Wadi Um Kabu, South Eastern Desert, Egypt
An unusual carbonate mineral is associated with the schists of Wadi Um Kabu in the South Eastern Desert of Egypt. It is subjected here to detailed mineralogical and chemical studies. It is revealed that the brownish and rhombic carbonate material under study is composed of: dolomite with MgO partly...
Elmentve itt :
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| Dokumentumtípus: | Cikk |
| Megjelent: |
University of Szeged, Department of Mineralogy, Geochemistry and Petrology
Szeged
1982
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| Sorozat: | Acta mineralogica-petrographica
25 No. 2 |
| Kulcsszavak: | Kőzettan, Ásványtan, Földtan |
| Tárgyszavak: | |
| Online Access: | http://acta.bibl.u-szeged.hu/24701 |
| Tartalmi kivonat: | An unusual carbonate mineral is associated with the schists of Wadi Um Kabu in the South Eastern Desert of Egypt. It is subjected here to detailed mineralogical and chemical studies. It is revealed that the brownish and rhombic carbonate material under study is composed of: dolomite with MgO partly replacing CaO and the mineral retaining the structure of its predecessor ferroan dolomite, calcite, goethite which is amorphous to poorly crystalline and possible brucite. It is suggested that the former ferroan dolomite was subjected to a thermal metamorphic pulse by means of which major part of Fe and some Ca and Mg were exuded while] the original ferroan dolomite is modified in chemical composition to the present dolomite. The expelled elements formed goethite, calcite and brucite, respectively. Both the dolomites and their schistose country rocks underwent differential mobilization of the three cations: Fe, Ca and Mg under thermal metamorphic environment. |
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| Terjedelem/Fizikai jellemzők: | 197-201 |
| ISSN: | 0365-8066 |