Ghoneim Mohamed Ahmed F. and Aly S. M. and El Baraga M. H.: Age of Betain Gneiss; implication for Late Precambrian crustal evolution in Souteastem Desert, Egypt. In: Acta mineralogica-petrographica, (34). pp. 41-50. (1993)
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Abstract
The gneiss-migmatite rocks pf Hodein area, which represents the southeastern extension of Beitan Gneisses, cover about 98 km and trend NW-SE. These rocks are overthrusted by supracrustal cover mainly arc-ophiolite assemblage and granitic rocks. Petrologically, the rocks are divided into biotite-gneisses, hornblende-gneisses, biotite-hornblende-gneisses, gamet-biotite-hornblende-gneisses ana augen-biotite-gneisses. The whole rock Sm-Nd isochron age of the Beitan gneisses yield 889±8 Ma (MSWD=8.5) which is consistent with Rb-Sr age (863±15 Ma, MSWD=9). This rock has initial £Nd and e'sr-values (-8.6 and +9.5, respectively) which reveals the age of early Pan-African. Moreover, the Nd-model age (TDM) of these rocks range from 1.46 to 2.65 Ga, negative ElNd and low e'sr-values reveal the existence of early Pan-African continental crust. The data are tested against mantlecrust mixing model. It is suggested that these rocks were derived throughout assimilation of about 35—50% Nd-enriched, sligntly Sr-depleted lower crust component by a mildly depleted subcontinental mantle source.
| Item Type: | Article |
|---|---|
| Journal or Publication Title: | Acta mineralogica-petrographica |
| Date: | 1993 |
| Volume: | 34 |
| ISSN: | 0365-8066 |
| Page Range: | pp. 41-50 |
| 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. 49-50. ; 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. 10:12 |
| URI: | http://acta.bibl.u-szeged.hu/id/eprint/24808 |
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