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Title

Garmichay S-type granites (northwestern Iran): Whole rock geochemistry, tectonic setting and generation mechanism

Pages

  53-72

Abstract

 The Garmichay area in the north of Mianeh, NW Iran, features schists, amphibolites, calc-silicates, marbles and granitoids. Granitoids are of S-and A-type nature. Partial melting is the main generation mechanism, the progenitor is a pelite enriched in muscovite and the major melting reaction is muscovite dehydration. The ASI for the S-type granite varies between 1. 12-1. 5 indicating peraluminous character and crustal origin. Both granitic types are enriched in LREE in relation to HREE with negative Eu anomalies. Lan/Ybn ranges are 1. 49-3. 09 and 1. 34-1. 99 for the S-type and the A-type granites, respectively. Moreover, Lan/Gdn varies between 2. 45 and 5 for the S-type granite and 1. 53 and 1. 75 for the A-type granite. The S-type granite has been generated in a collisional zone during Assyntic Orogeny. The A-type granite, however, is formed in a within-plate environment. The A-type granite belongs to A1 subtype formed in a continental rifting setting. The crystallization temperatures for the S-type and the A-type granites vary from 650 to 750 º C and 800 to 850 º C, respectively.

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    APA: Copy

    Mahamed, Amir, MOAYYED, MOHSEN, & MODJARRAD, MONIR. (2020). Garmichay S-type granites (northwestern Iran): Whole rock geochemistry, tectonic setting and generation mechanism. PETROLOGY, 11(41 ), 53-72. SID. https://sid.ir/paper/385202/en

    Vancouver: Copy

    Mahamed Amir, MOAYYED MOHSEN, MODJARRAD MONIR. Garmichay S-type granites (northwestern Iran): Whole rock geochemistry, tectonic setting and generation mechanism. PETROLOGY[Internet]. 2020;11(41 ):53-72. Available from: https://sid.ir/paper/385202/en

    IEEE: Copy

    Amir Mahamed, MOHSEN MOAYYED, and MONIR MODJARRAD, “Garmichay S-type granites (northwestern Iran): Whole rock geochemistry, tectonic setting and generation mechanism,” PETROLOGY, vol. 11, no. 41 , pp. 53–72, 2020, [Online]. Available: https://sid.ir/paper/385202/en

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