The Lanthanide Tetrad Effects and its Correlation with Na2o, K2o, Alklis, and Zr/Hf Involving Granitoid Rocks of Wadi Kharm El Belawi Area, Northern Eastern Desert, Egypt | ||
| Egyptian Journal of Geology | ||
| Article 23, Volume 62, Issue 1, 2018, Pages 363-371 PDF (572.18 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/egjg.2018.366382 | ||
| Author | ||
| Magdy S. Basta | ||
| Faculty of Petroleum and Mining Engineering, Suez University, Egypt | ||
| Abstract | ||
| The basement rocks in Wadi Kharm El Belawi area are represented by Dokhan volcanics, granodiorites and younger granites. They were produced from calc alkali magma, under a compress regional regime. The lanthanide tetrad effects are observed in the REE pattern of older granites and younger granites of Wadi Kharm El Belaw. The values, of tl. t3. t4, TE1, 3 were calculated and plotted vs. Na2O. K2O, total alkalis and Zr/Hf. The diagrams reveal that the tetrad effect developed conformable with the evolution of the alkali feldspar granites, and significant tetrad effects are confined to highly differentiated samples. The strong decrease in the Eu concentration in the highly evolved rocks is related to Eu fractionation between the residual melt and a coexisting high temperature aqueous fluid. The results point to significant changes in element fractionation behavior in highly evolved granitic melts indicating that ionic radii and charge (which commonly control the element distribution between minerals and melt), are no longer the exclusive control. | ||
| Keywords | ||
| Lanthanide titrate; Dokhan volcanics; granodiorites and younger granites | ||
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