CONTACT METAMORPHISM IN THE SHAHINDEZH METAMORPHIC CORE (SMC)-NW IRAN; PT CONDITIONS AND MICROSTRUCTURAL EVIDENCE FOR PARTIAL MELTING OF METAPELITES

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MOJARAD M.; MOAZEN M.; MOAYED M.

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Journal: Iranian Journal of Crystallography and Mineralogy Year:2008 | Volume:15 | Issue:2 Page(s): 493-514

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Title

CONTACT METAMORPHISM IN THE SHAHINDEZH METAMORPHIC CORE (SMC)-NW IRAN; PT CONDITIONS AND MICROSTRUCTURAL EVIDENCE FOR PARTIAL MELTING OF METAPELITES

Author(s)

MOJARAD M. | MOAZEN M. | MOAYED M. | Issue Writer Certificate

Keywords

METAPELITESQ2

THERMOCALCQ3

MUSCOVITE-BIOTITE BREAKDOWNQ3

MICROSTRUCTUREQ3

PARTIAL MELTINGQ2

SHAHINDEZH METAMORPHIC COREQ3

IRANQ2

Abstract

Contact metamorphism in the SHAHINDEZH METAMORPHIC CORE (SMC), which is occurred due to intrusion of Pichaghchi granodiorite during Laramian orogeny (Upper Cretaceous), is studied here. The well developed mineral parageneses at the aureole is quatz + plagioclase + biotite + cordierite±chlorite±K-feldspar±muscovite±and alusite±sillimanite± garnet. Pressure and temperature of the contact metamorphism at the SMC for andalusite + cordierite -bearing assemblages (the most common paragenesis at the aureole) are estimated ~3.5±1.5 kbar and 500±50°C using THERMOCALC computer program. Also the exact position of the muscovite + biotite breakdown reaction at the PT space, is calculated. Temperature for MUSCOVITE-BIOTITE BREAKDOWN was about 650±40°C at 3.5 kbar. The calculated position of the reaction curve, is in good agreement with published experimental data. The METAPELITES at the north-eastern part of the SMC contain high-temperature assemblage quartz + biotite + garnet + sillimanite + plagioclase±cordierite±K-feldspar. The mineral assemblages and reaction textures in the aureole rocks record temperature about <750°C at the sillimanite -cordierite zone and pressure ~ 4 kbar, determined using petrogenetic grids. In the partially molten rocks garnet porphyroblasts are associated with coarse-grained quartz. Cordierites occurred both at the rims of residual garnets crystallized during regional metamorphism and in the matrix. All cordierites' are altered to pennite. Fibrolite inclusions in the matrix cordierites are common.

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APA: Copy

MOJARAD, M., MOAZEN, M., & MOAYED, M.. (2008). CONTACT METAMORPHISM IN THE SHAHINDEZH METAMORPHIC CORE (SMC)-NW IRAN; PT CONDITIONS AND MICROSTRUCTURAL EVIDENCE FOR PARTIAL MELTING OF METAPELITES. IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY, 15(2), 493-514. SID. https://sid.ir/paper/3993/en

Vancouver: Copy

MOJARAD M., MOAZEN M., MOAYED M.. CONTACT METAMORPHISM IN THE SHAHINDEZH METAMORPHIC CORE (SMC)-NW IRAN; PT CONDITIONS AND MICROSTRUCTURAL EVIDENCE FOR PARTIAL MELTING OF METAPELITES. IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY[Internet]. 2008;15(2):493-514. Available from: https://sid.ir/paper/3993/en

IEEE: Copy

M. MOJARAD, M. MOAZEN, and M. MOAYED, “CONTACT METAMORPHISM IN THE SHAHINDEZH METAMORPHIC CORE (SMC)-NW IRAN; PT CONDITIONS AND MICROSTRUCTURAL EVIDENCE FOR PARTIAL MELTING OF METAPELITES,” IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY, vol. 15, no. 2, pp. 493–514, 2008, [Online]. Available: https://sid.ir/paper/3993/en

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