Volume 26, Issue 1 (4-2018)                   www.ijcm.ir 2018, 26(1): 137-148 | Back to browse issues page


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Rahimi, Mirnejad, Sheibi, Modabberi. Mineral chemistry and geothermobarometry of Spid pluton (West Qom). www.ijcm.ir. 2018; 26 (1) :137-148
URL: http://ijcm.ir/article-1-1056-en.html
Abstract:   (392 Views)
Spid pluton with Neogene age outcrop in the Urumieh-Dokhtar Magmatic belt. Amphibole in this intrusion is calcic and magmatic and its composition corresponds to magnesiohornblende to actinolite which reflects the type I granitoid. Geobarometry calculations show that the amphibole crystalized at pressure of 2.5 to 3.7 kbr corresponding to a depth of 8 to 12 km. Based on geothermometry of hornblende - plagioclase pairs and amphibole, a temperature of 752 to 865 °C is estimated for crystallization of these two minerals at the Spid pluton. In addition, log ƒO2 for this pluton equals to -12.18 to -15.27, which reflects relatively high oxygen fugacity in magma and indicates the formation of this pluton in the subduction zone.
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Type of Study: Research | Subject: Special
Received: 2018/02/28 | Accepted: 2018/02/28 | Published: 2018/02/28

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