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Oxygen Fugacity and Water Activity during Thermal Peak and Retrogression of Granulites around the Sarvapuram Area, Karimnagar Granulite Terrane, Andhra Pradesh, India
投稿时间:2018-08-30  修订日期:2018-12-05  点此下载全文
引用本文:P. Chandra SINGH,D. PRAKASH.2019.Oxygen Fugacity and Water Activity during Thermal Peak and Retrogression of Granulites around the Sarvapuram Area, Karimnagar Granulite Terrane, Andhra Pradesh, India[J].ACTA GEOLOGICA SINICA(English edition),93(6):1900~1908
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DOI:10.1111/1755-6724.13817
作者单位E-mail
P. Chandra SINGH 1 Department of Earth Sciences, Indian Institute of Technology, Powai, Mumbai, 400076, India 2 Centre of Advanced Study in Geology, Banaras Hindu University, Varanasi, 221005, India pcsinghgeo21@gmail.com 
D. PRAKASH 2 Centre of Advanced Study in Geology, Banaras Hindu University, Varanasi, 221005, India  
 
Author NameAffiliationE-mail
P. Chandra SINGH 1 Department of Earth Sciences, Indian Institute of Technology, Powai, Mumbai, 400076, India 2 Centre of Advanced Study in Geology, Banaras Hindu University, Varanasi, 221005, India pcsinghgeo21@gmail.com 
D. PRAKASH 2 Centre of Advanced Study in Geology, Banaras Hindu University, Varanasi, 221005, India  
Abstract:The investigated area around Sarvapuram represents a part of the Karimnagar granulite terrane of the Eastern Dharwar Craton, India. Garnet–bearing gneiss is hosted as enclaves, pods within granite gneiss and charnockite. It is largely made up of garnet, orthopyroxene, cordierite, biotite, plagioclase, K–feldspar, sillimanite and quartz. The peak metamorphic stage is represented by the equilibrium mineral assemblage i.e. garnet, orthopyroxene, cordierite, biotite, plagioclase, sillimanite and quartz. Breakdown of the garnet as well as preservation of the orthopyroxene–cordierite symplectite, formation of cordierite with the consumption of the garnet + sillimanite + quartz represents the decompressional event. The thermobarometric calculations suggest a retrograde P–T path with a substantial decompression of c. 3.0 kbar. The water activity (XH2O) conditions obtained with the winTWQ program for core and symplectite compositions from garnet–bearing gneiss are 0.07–0.14 and 0.11–0.16 respectively. The quantitative estimation of oxygen fugacity in garnet–bearing gneiss reveal log fO2 values ranging from ?11.38 to ?14.05. This high oxidation state could be one of the reasons that account for the absence of graphite in these rocks.
keywords:metamorphic conditions, oxygen fugacity, water activity, garnet–bearing gneisses, Karimnagar granulite terrane, India
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