High-temperature metamorphism event in the East and North East Borujerd granite body from

Document Type : علمی -پژوهشی

Authors

1 Assistant professor, Department of Geochemistry, Faculty of Earth sciences, Kharazmi University

2 M.Sc student, Department of Geochemistry, Faculty of Earth sciences, Kharazmi University

3 Assistant professor, Department of Geology, Faculty of Science, Payame-Noor University

10.29252/esrj.9.3.81

Abstract

The Boroujerd granitoid complex is part of Sanandaj-Sirjan structural zone and located in the West of Iran. This igneous complex in the Upper Jurassic (20 ± 167 million years) intruded to older metamorphic schist. Hornblende hornfels and pyroxene hornfels metamorphic facies has created around Boroujerd granite body. Migmatites phenomenon in parts of proximity halo observed that evidence of specially increased geothermal gradient in the Boroujerd aureole contact metamorphism. Quartz, feldspar and biotite is main minerals in leucosome migmatites parts, so orthopyroxene , garnet and sillimanite has fond. In the melanosome migmatites parts orthopyroxene +garnet+sillimanite+cordierite +corundum paragenesis indicated temperature and pressure above the pyroxene hornfels facies and show low pressure bounds of the granulate. Associated garnet-biotite cation exchange, temperatures of 635-720° C, in the 3-4 K bar pressure accepted for migmatites. This temperature and pressure higher than normal and its proximity changes the crystallization of certain minerals such is corundum.

Keywords

References

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Researches in Earth Sciences
Volume 9, Issue 3 - Serial Number 35
September 2018
Pages 81-93

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