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Ghasemi Siani M, Mehrabi B. Geothermometry of Dardvay anomaly skarn zones, Sangan mining area. www.ijcm.ir 2020; 28 (1) :125-140
URL: http://ijcm.ir/article-1-1423-en.html
URL: http://ijcm.ir/article-1-1423-en.html
Abstract: (2288 Views)
Dardvey iron skarn ore deposit is located in the central part of the Sangan mininig area, northeastern Iran. In this study, silicate geothermometr were used to estimate the formation temperatures of skarn zones in Dardvey Fe-skarn deposits. The main metamorphic minerals in prograde and retrograde skarn zones are garnet-clinopyroxene-tremolite/actinolite-amphibole-chlorite-epidote-feldspar-phlogopite-dolomite. Two feldspar geothermometry indicate that endoskarn zone in Sarnowsar granite form at temperatures between 635 to 725 °C, which is not consistent with fluid inclusion tempertures. Based on clinopyroxene-garnet geothermometry, temperature of 300 to 505 ˚C was calculated for prograde skarn stage. Chlorite and Ca-amphibole geothermometry of retrograde zone indicates temperature of 200 to 290 °C and 200 to 300 °C respectively. Silicate minerals geothermometry of prograde and retrograde skarn zones are in accordance with fluid inclusion data. Both geothermometery methodes of prograde and retrograde skarn zones indicate that contact metamorphic sakarn development occuured in <600 ˚C that is consistent with hornblende hornfels facies.
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