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Volume :7 Issue : 1 1980      Add To Cart                                                                    Download

Geochemistry of coexisting biotites and Ca-amphiboles from Zaker granitic rocks of Zanjan District, northwest Iran

Auther : A. M. REFAAT, M. L. KABESH AND Z. M. ABDALLAH

Teachers Institute of Education, El-Odylia, Kuwait; Earth Sciences Laboratory, National Research Centre, Dokki, Cairo, Egypt; Teachers Institute of Education. El-Shamia, Kuwait

 

ABSTRACT

 

The coexisting biotitcs and amphiboles from Zaker granitic rocks have low Fe3+ content which suggests low oxygen fugacities. The absorption colour variations of biotite and amphibole are greatly affected by their Ti/Fe2+ and Fe3+/(Fe+ +Fe3+) ratios. The variations in the distribution coefficient of the coexisting biotites and amphiboles suggest that they were crystallized under variable conditions of temperature and pressure and also suggest the presence of a chemical disequilibrium stage between them. The low K&& values in the coexisting biotites and amphiboles indicate that the investigated minerals and their host rocks were crystallized under low temperature and pressure. The low Ticontent of Zaker amphiboles also confirmed the low crystallisation temperature of the hornblende and edenite. The contents of Sr in biotites and Ga, Cu and Ba in the amphiboles show some irregularities in their concentrations during the chemical gradations of the host rocks towards the felsic end member. The high K/Rb ratios in the biotites and the low values of Ti in the amphiboles suggest a metamorphic origin for both minerals.

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