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Volume :6 Issue : 1 1979      Add To Cart                                                                    Download

Geochemistry of plagioclase phenocrysts from andesite dykes of Wadi El-Mellaha area, Eastern Desert, Egypt

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

Earth Sciences Laboratory, National Research Centre, Dokki, Cairo, Egypt; Teachers

Institute of Education, El-Odylia, Kuwait and  Teachers Institute of Education, El Shamia, Kuwait

 

ABSTRACT

 

Six plagioclase phenocryst samples have been separated from andesitic dyke rocks of Wadi El-Mellaha area. Selected major and trace elements of the plagioclase phenocrysts and their host rocks were chemically determined. The distribution and behaviour of these elements in the plagioclases and andesitic host rocks were analysed to determine the chemistry of plagioclase phenocrysts and the genesis of the host rocks. The plagioclase phenocrysts are characterized by low Ca, Sr and Fe contents toward the felsic end member. Opposite relations are observed in the case of Na, Ba and Ga. It is evident that the host rocks of plagioclase phenocrysts were formed from intermediate melt through a short-range fractional crystallization process.

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