Mineral chemistry, pressure-temperature determination and fluids activities in Boroujerd migmatites using cordierite mineral

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Zare Shooli Masoumeh; TAHMASBI ZAHRA; SAKI ADEL; AHMADI KHALAJI AHMAD

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Journal: Iranian Journal of Crystallography and Mineralogy Year:2019 | Volume:27 | Issue:1 Page(s): 135-150

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Title

Mineral chemistry, pressure-temperature determination and fluids activities in Boroujerd migmatites using cordierite mineral

Author(s)

Zare Shooli Masoumeh | TAHMASBI ZAHRA | SAKI ADEL | AHMADI KHALAJI AHMAD | Issue Writer Certificate

Keywords

CordieriteQ2

fluid activitiesQ1

migmatitesQ2

BoroujerdQ2

Abstract

The intrusion of Boroujerd Granitoid Complex into the metamorphosed pelitic rocks has resulted in the formation of pelitic hornfelses and anatectic migmatites in its metamorphic aureole. The effective melting reactions include fluid-present and fluid-absent. Fluid-present melting reactions may have consumed the whole free fluid in the aureole as a result of which melting process continued through fluid-absent reactions. It is highly probable that high-grade mineral assemblages like spinel+corundum in the aureole have formed by biotite dehydration reactions. As a result, the presence of spinel and corundum minerals in these rocks is related to the fluid-absent partial melting. Using thermodynamic equilibrium of minerals and multiple equilibrium reactions, peak pressure and temperature of metamorphism are estimated as 4 kbar and 750 ° C respectively. The total fluid activity in melanosome Cordierites (a CO2 [0. 15] + a H2O [0. 6]) is 0. 75 at the aforementioned pressure and temperature. Melt-water content in Boroujerd migmatites is 3. 75 % and H2O content of Cordierite in melanosomes is 1. 1 %. Considering these numbers, the Dw of melt reactions at 750 ° C for Boroujerd migmatites is 3. 41 % that correlates with biotite dehydration reactions. The H2O content of melts matches the minimum water line which is representative of fluid-absent conditions and confirms the correctness of petrographical studies, fluid-absent reactions and the estimated Dw in migmatites.

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APA: Copy

Zare Shooli, Masoumeh, TAHMASBI, ZAHRA, SAKI, ADEL, & AHMADI KHALAJI, AHMAD. (2019). Mineral chemistry, pressure-temperature determination and fluids activities in Boroujerd migmatites using cordierite mineral. IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY, 27(1 ), 135-150. SID. https://sid.ir/paper/4174/en

Vancouver: Copy

Zare Shooli Masoumeh, TAHMASBI ZAHRA, SAKI ADEL, AHMADI KHALAJI AHMAD. Mineral chemistry, pressure-temperature determination and fluids activities in Boroujerd migmatites using cordierite mineral. IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY[Internet]. 2019;27(1 ):135-150. Available from: https://sid.ir/paper/4174/en

IEEE: Copy

Masoumeh Zare Shooli, ZAHRA TAHMASBI, ADEL SAKI, and AHMAD AHMADI KHALAJI, “Mineral chemistry, pressure-temperature determination and fluids activities in Boroujerd migmatites using cordierite mineral,” IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY, vol. 27, no. 1 , pp. 135–150, 2019, [Online]. Available: https://sid.ir/paper/4174/en

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