Kuwait-University-Journal-of-Law-header
Search
Kuwait Journal of Science

Previous Issues

Advance Search
Year : From To Vol
Issue Discipline:
Author

Volume :3 Issue : 1 1976      Add To Cart                                                                    Download

Textural properties of feldspars in Ras Barud granitic rocks, Safaga District, Eastern Desert, Egypt

Auther : MOHAMED E. HILMY, ADEL M. REFAAT, MAHMOUD L. KABESH, AND Z E I N A B M. ABDALLAH

Department of Geology, Faculty of Science, Ain Shams University, Abbasia, Cairo, Teachers Institute of Education, El-Odylia, Kuwait, Earth Sciences Laboratory, National Research Centre, Dokki, Cairo and Teachers Institute of Education, El-Shamia, Kuwait.

 

ABSTRACT

 

The purpose of this paper is to study the textural variations of Ras Barud granitic rocks. It is evident that the microcline perthite of the buff granites is characterised by the presence of poikilitic albite which is formed through the action of Na-bearing solutions penetrating the fissures of the unmixed perthite. The occurrence of exsolution and replacement processes at high and low temperatures respectively is responsible for the formation of the examined microcline perthite in the buff granites. The microcline perthite of some examined adamellites contains albite, quartz, and muscovite in its cracks indicating deposition from external solutions. The shape and nature of the graphic intergrowths between orthoclase and quartz in the red and pink granites are controlled by kinetic factors during the simultaneous crystallization of magma under vapour-rich and rapid cooling conditions. The intergrowth relation between perthite, microcline perthite and quartz in the greyish-white and buff granites suggests that sodic and silicic solutions have attacked the K-feldspar and given rise to perthite and microcline perthite which are cut by quartz rods forming graphic texture. The granophyres of the white granite are mostly formed by a very rapid simultaneous growth between quartz and feldspars.

Kuwait Journal of Science
Journal of Law

You are Visitor No.

55166

Journal of Law
Journal of Law
Tell your friendsJournal of Law
Journal of Law

Last Updated

Jun 19, 2012

Journal of Law
Journal of Law
Journal of Law

Please enter your email Here to receive our news

Journal of Law