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Volume :5 Issue : 1 1978      Add To Cart                                                                    Download

Geochemistry of granite rocks in Ras Barud area, Eastern Desert, Egypt

Auther : ADEL M. REFAAT, MAHMOUD L. KABESH, MOHAMED E. HILMY AND ZEINAB M. ABDALLAH

Teachers Institute of Education, El-Odylia, Kuwait; National Research Centre, Dokki, Cairo, Egypt; Faculty of Science, Ain Shams University, Cairo, Egypt; and Teachers Institute of Education, El-Shamia, Kuwait

 

ABSTRACT

 

The distribution and occurrence of trace elements in the Ras Barud granite rocks provide information concerning the genesis of the calc-alkaline rocks. Trace elements were analysed for 45 granite samples. The trace elements of the granitic rocks show high concentrations of Ba, Sr, V and Zr at the early stage of crystallization of the magma, while Rb, Li and Ga are concentrated at the late crystallization stage of magma. Small differences in the K/Rb ratios of Ras Barud granitic rocks are observed. Low K/Rb ratios in some of the granodiorites are attributed to the high content of biotite. It is concluded that a process of hybridization between mafic materials and granitic magma took place during the late stage of magmatic crystallization. This hybridization process led to the formation of some patches of dark grey granodiorites with high biotite content.

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Jun 19, 2012

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