Biotite geochemistry and its formation conditions in the Laleh-Zar granitoid complex in the south of Hararan region.

Document Type : Original Article

Authors

1 Shahid Beheshti university

2 Kharazmi unuvercity, Tehran, Iran

10.61186/ijcm.31.4.697

Abstract

Biotite is usually formed as a rock-forming mineral in a wide range of felsic to intermediate intrusive rocks, and due to its complex crystal structure caused by the substitution of different Elements, it can record the physicochemical conditions of the source magma. Based on the chemical classification of mica, the biotites of the igneous rocks investigated in the Hararan area are placed between the poles of phlogopite and enite, and are magnesium, which indicates their formation in high oxygen fugacity, and according to the amounts of Mg, TiO2 and FeO oxides, these Biotites are primary type. These biotites belong to the calc-alkaline magmatic series that were formed in the subduction environment. Based on the chemistry of biotites, oxygen fugacity in the Source magma of Lalezar granitoids is in the range of iron oxides, and geothermometry of biotites shows the temperature of their formation between 680 to 780 degree Celsius  and their pressure obtained down 2 (1-2) Kbars.

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History

  • Receive Date: 06 February 2023
  • Accept Date: 09 July 2023

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