Thermobarometry and Tectonic Setting of Metamorphic Rocks from Ophiolitic Mélange of South Dehshir (SW Yazd)

heidari, Khadijeh; nasrabady, mohsen; nozaem, reza

doi:10.52547/gnf.6.1.109

Volume 6, Issue 1 (Spring & Summer 2020) KJES 2020, 6(1): 109-132 | Back to browse issues page

‎ 10.52547/gnf.6.1.109

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heidari K, nasrabady M, nozaem R. Thermobarometry and Tectonic Setting of Metamorphic Rocks from Ophiolitic Mélange of South Dehshir (SW Yazd). KJES 2020; 6 (1) :109-132
URL: http://gnf.khu.ac.ir/article-1-2730-en.html

Thermobarometry and Tectonic Setting of Metamorphic Rocks from Ophiolitic Mélange of South Dehshir (SW Yazd)

Khadijeh Heidari¹

, Mohsen Nasrabady ^*

², Reza Nozaem³

1- Geology Department, Imam Khomeini International University, Qazvin
2- Geology Department, Imam Khomeini International University, Qazvin , nasrabady@sci.ikiu.ac.ir
3- School of Geology, Faculty of Science, University of Tehran

Abstract: (868 Views)

Ophiolitic mélange of south Dehshir is a slice of Nain-Baft ophiolitic belt. Blocks of metamorphic rocks that consist of amphibolite, banded Px-Ep amphibolite, Grt-Px amphibolite, Grt-Am gneiss and Grt-Ep hornblendite are cropped out along with crustal and mantle sequence of ophiolites from south Dehshir. Thermoberometry results of three samples of Grt-Px amphibolite, Grt-Am gneiss and Grt-Ep hornblendite are compatible and indicating an average temperature and pressure of 664°C and 8.8 kb, respectively. PT conditions of metamorphic rocks of south Dehshir ophiolitic mélange are in accordance with the conditions of those from the other worldwide ophiolitic sutures. Intimate spatial relation between investigated metamorphic rocks and adjoining ophiolites, PT conditions of metamorphism and whole rock chemistry indicate that these rocks representing oceanic lithosphere of suprasubduction zone and have derived from sole metamorphism event in the subduction initiation setting.

Keywords: Sole metamorphism, Thermobarometry, Subduction initiation, Dehshir

Full-Text [PDF 1746 kb] (484 Downloads)

Subject: Petrology
Received: 2020/01/17 | Accepted: 2020/08/31 | Published: 2020/08/31