MINERAL CHEMISTRY AND THERMOBAROMETRY OF MIGMATITIC ROCKS OF BOROUJERD AREA (NORTH OF SANANDAJ-SIRJAN ZONE)

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HEYDARIANMANESH AREFEH; TAHMASBI ZAHRA; AHMADI KHALAJI AHMAD

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Journal: PETROLOGY Year:2016 | Volume:7 | Issue:25 Page(s): 117-138

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Title

MINERAL CHEMISTRY AND THERMOBAROMETRY OF MIGMATITIC ROCKS OF BOROUJERD AREA (NORTH OF SANANDAJ-SIRJAN ZONE)

Author(s)

HEYDARIANMANESH AREFEH | TAHMASBI ZAHRA | AHMADI KHALAJI AHMAD | Issue Writer Certificate

Keywords

GEOTHERMOBAROMETRYQ3

PARTIAL MELTINGQ2

MIGMATITEQ2

MAGMATIC ARCQ1

BOROUJERDQ2

SANANDAJ-SIRJAN ZONEQ2

Abstract

Migmatites have formed an important part of high-grade metamorphism in the BOROUJERD area aureole (north of SANANDAJ-SIRJAN ZONE). Migmatitic complex including: MIGMATITEs, schist MIGMATITEs and hornfelse MIGMATITEs with a different range of structural and mineralogical compositions. These rocks are observed as light (leucosome), dark (melanosome) and dark and light (mesosome). Leucosomes mainly composed from quartz, plagioclase, K-feldspar, biotite and muscovite and also have perthite, poikiloblastic, granoblastic, graphic and myrmekite textures. Melanosomes formed from minerals such as biotite, garnet, andalusite, tourmaline and sillimanite have lepidobalastic, porphyrolepidoblastic and lepidoporphyrobalastic textures. Mesosomes formed from dark and light minerals and show porphyroblastic, lepidoblastic and granoblastic textures. According to petrographic studies and whole rock chemical analyses for these rocks revealed that dominant protolith is pelitic rocks. The thermobarometry results showed temperature range of of 568°C to 662°C and pressure of 2.8 to 3.3 kbars. According to the calculated temperature and pressure, the geothermal gradient of schist MIGMATITEs and hornfels MIGMATITEs determined 48°C/km and 60°C/km, respectively. Heat release of the Bourojerd pluton, mafic magmatism in area (that enclaves of them can be seen in the granitoids) and subduction fluid causes MIGMATITEs that it shows the main factor increasing geothermal gradient is the presence of hot igneous plutons and enter intrusion fluid in the MAGMATIC ARCs.

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APA: Copy

HEYDARIANMANESH, AREFEH, TAHMASBI, ZAHRA, & AHMADI KHALAJI, AHMAD. (2016). MINERAL CHEMISTRY AND THERMOBAROMETRY OF MIGMATITIC ROCKS OF BOROUJERD AREA (NORTH OF SANANDAJ-SIRJAN ZONE). PETROLOGY, 7(25), 117-138. SID. https://sid.ir/paper/196926/en

Vancouver: Copy

HEYDARIANMANESH AREFEH, TAHMASBI ZAHRA, AHMADI KHALAJI AHMAD. MINERAL CHEMISTRY AND THERMOBAROMETRY OF MIGMATITIC ROCKS OF BOROUJERD AREA (NORTH OF SANANDAJ-SIRJAN ZONE). PETROLOGY[Internet]. 2016;7(25):117-138. Available from: https://sid.ir/paper/196926/en

IEEE: Copy

AREFEH HEYDARIANMANESH, ZAHRA TAHMASBI, and AHMAD AHMADI KHALAJI, “MINERAL CHEMISTRY AND THERMOBAROMETRY OF MIGMATITIC ROCKS OF BOROUJERD AREA (NORTH OF SANANDAJ-SIRJAN ZONE),” PETROLOGY, vol. 7, no. 25, pp. 117–138, 2016, [Online]. Available: https://sid.ir/paper/196926/en

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