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Sheykhi M, Rezaei-Kahkhaei M, Ghasemi H A. Biotite and feldspar chemistry: An approach to the petrogenesis of the Gapdan pluton (NW of Zahedan) . www.ijcm.ir 2019; 27 (3) :635-648
URL: http://ijcm.ir/article-1-1332-en.html
URL: http://ijcm.ir/article-1-1332-en.html
Biotite and feldspar chemistry: An approach to the petrogenesis of the Gapdan pluton (NW of Zahedan)
1- Shahrood University of Technology
Abstract: (3033 Views)
The 43Ma Gapdan granitoid pluton is a part of Zahedan-Saravan granitoid belt and is located about 50 km NW of Zahedan. The pluton is mainly composed of biotite granite and granodiorite in composition and consists of quartz, plagioclase, K-feldspar, biotite, Fe-Ti oxides, zircon, apatite, and allanite. The granitoid rocks are mainly granular in texture, although they display poikilitic, perthite and myrmekite textures. The present paper aims to determine nature, the physico-chemical of crystallization and tectonic setting of the pluton based on mineral chemistries of biotite and feldspar. The biotite chemistry represents that the pluton is I-type and calc-alkaline which formed in an active continental margin. Biotite thermo-barometry presents that the mineral has been crystalized at 850 oC and 2-5 kbar, while two-feldspar thermometry shows temperatures of 555-734 oC which is a subsolidus re-equilibrium temperature of elements for Gapdan granitoid rocks. The pluton hosted lots of sedimentary and igneous enclaves, suggesting the parent magma was contaminated with country rocks during ascending and emplacement.
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