Volume 16, Issue 42 (Geology New Findings 1/1- 2015)
2015, 16(42): 71-88 |
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mirlohi A, Khalili M, Tabatabaei-manesh S M, Massonne H. Mica chemistry and metamorphism in garnet-micaschists of Haji-Qara high, North of Golpayegan. Journal title 2015; 16 (42) :71-88
URL: http://jsci.khu.ac.ir/article-1-1842-en.html
URL: http://jsci.khu.ac.ir/article-1-1842-en.html
1- Department of Geology, university of Isfahan
2- Department of Geology, Faculty of Sciences, University of Isfahan, Isfahan, Iran
3- Department of Geology, Faculty of Sciences, University of Isfahan,
4- 1. Institut Für Mineralogie und Kristallchemie, Universität Stuttgart, Azenbergstr. 18, D-70174 Stuttgart, Germany
2- Department of Geology, Faculty of Sciences, University of Isfahan, Isfahan, Iran
3- Department of Geology, Faculty of Sciences, University of Isfahan,
4- 1. Institut Für Mineralogie und Kristallchemie, Universität Stuttgart, Azenbergstr. 18, D-70174 Stuttgart, Germany
Abstract: (16205 Views)
Garnet-micaschists from Haji Qara high, north of Golpayegan, are part of the metamorphic rocks of the Sanandaj-Sirjan Zone (SSZ). Lepidoporphyroblastic and porphyropoikiloblastic are the main textures and the mineral assemblages consist dominantly of Fe-biotite, muscovite and ferriphengite, metamorphic Fe-Mg chlorites (I-type and IIb), garnet and quartz. Staurolite, andalusite, plagioclase carbon, Fe-oxides and tourmaline are present as accessories. Petrographic evidences as well as mica chemistry along with other paragenesis and thermometric estimations indicate a path change from amphibolites facies to lower pressure and higher temperature gradient suggesting the presence of a local pluton which led to garnet porphyroblast, biotite and muscovite (overprinted in different orientation) and andalusite crystallization. The occurrence of chlorite, ferriphengite and Fe-oxides demonstrate a retrograde metamorphism during uplift and decompressional cooling path in the area.
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