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Volume :5 Issue : 1 1978      Add To Cart                                                                    Download

On potash feldspar megacrysts and their bearing on the petrogenesis of El-Ineigi granite rocks, Eastern Desert, Egypt

Auther : MAMDOUH A. HASSAN AND MOHAMED A. HEIKAL

Department of Geology, University of Kuwait, and Faculty of Science, King Abdel Aziz University, Jeddah, Saudi Arabia

 

ABSTRACT

 

The potash feldspar megacrysts of El-Ineigi granitic rocks include oriented and zonally arranged plagioclase crystals. These plagioclase inclusions are occasionally observed parallel to the re-entrant angles at the twin planes of the potash feldspar megacrysts. Biotite inclusions are similarly oriented. These observations, in addition to the shape and anorthite content of the plagioclase inclusions, suggest growth of the megacrysts in a silicate melt. Hence the magmatic origin of the potash feldspar megacrysts and their host granitic rocks is ascertained.

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Jun 19, 2012

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