Petrographical study of paragneisses in Northeast of Golpayegan: migmatization and evidences of retrograde metamorphism

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Hashemi Mahin; DAVOUDIAN DEHKORDI ALIREZA; SHABANIAN BOROUJENI NAHID; AZIZI HOSEIN

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Journal: Iranian Journal of Crystallography and Mineralogy Year:2019 | Volume:27 | Issue:1 Page(s): 179-190

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Title

Petrographical study of paragneisses in Northeast of Golpayegan: migmatization and evidences of retrograde metamorphism

Author(s)

Hashemi Mahin | DAVOUDIAN DEHKORDI ALIREZA | SHABANIAN BOROUJENI NAHID | AZIZI HOSEIN | Issue Writer Certificate

Keywords

PetrographyQ2

paragneissesQ1

migmatizationQ1

retrograde metamorphismQ2

Northeast of GolpayeganQ1

Abstract

The studied area, as Ykeh-Chah unit, is a part of Golpayegan magmatic and metamorphic complex in Sanandaj-Sirjan structural zone. The unit consists of mylonitized and high-grade metamorphic rocks, including biotite-gneiss, biotite-garnet-gneiss, amphibolite and orthogneiss. The biotite gneiss and the biotite garnet gneiss have partly been migmatitized. They show various structures such as stromatic, ptygmatic, folded, ophthalmitic, net like, and patchy. Leucosomes are as in-situ and vein leucosomes. According to the leucosome type and some preserved igneous microstructures in leucosome, partial melting of metasedimentary units have been the dominant process in the generation of the migmatites. The most reliable microstructural criterion, as the evidences of partial melting in the migmatites, are simple twinning in K-feldspar, corroded biotite, plagioclase with zoning, melt presence, symplectic replacement aggregates in leucosome and mesosome, muscovitization some of the minerals. Due to the presence of leucosome and migmatization process, the rocks have been undergone the prograde metamorphism at the increasing temperatures until the partial melting, and finally experienced retrograde metamorphism during cooling. Evidence of the retrograde metamorphism in the rocks include the emplacement of rutile by titanite and ilmenite, symplectite texture (quartz + muscovite), myrmekite texture (quartz + plagioclase), atoll garnet, alteration of garnet to quartz and chlorite.

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APA: Copy

Hashemi, Mahin, DAVOUDIAN DEHKORDI, ALIREZA, SHABANIAN BOROUJENI, NAHID, & AZIZI, HOSEIN. (2019). Petrographical study of paragneisses in Northeast of Golpayegan: migmatization and evidences of retrograde metamorphism. IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY, 27(1 ), 179-190. SID. https://sid.ir/paper/4163/en

Vancouver: Copy

Hashemi Mahin, DAVOUDIAN DEHKORDI ALIREZA, SHABANIAN BOROUJENI NAHID, AZIZI HOSEIN. Petrographical study of paragneisses in Northeast of Golpayegan: migmatization and evidences of retrograde metamorphism. IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY[Internet]. 2019;27(1 ):179-190. Available from: https://sid.ir/paper/4163/en

IEEE: Copy

Mahin Hashemi, ALIREZA DAVOUDIAN DEHKORDI, NAHID SHABANIAN BOROUJENI, and HOSEIN AZIZI, “Petrographical study of paragneisses in Northeast of Golpayegan: migmatization and evidences of retrograde metamorphism,” IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY, vol. 27, no. 1 , pp. 179–190, 2019, [Online]. Available: https://sid.ir/paper/4163/en

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