Application of the two-feldspar geothermometer to ultrahigh-temperature(UHT) rocks in the Khondalite belt,North China craton and its implications

作     者：Shujuan Jiao~* and Jinghui Guo State Key Laboratory of Lithospheric Evolution,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijng 100029,China 

会议名称：《中国科学院地质与地球物理研究所第11届（2011年度）学术年会》

会议日期：2012年

学科分类：070801[理学-固体地球物理学] 07[理学] 0708[理学-地球物理学] 

基　　金：supported financially by research grant no 407303 15 from the NSFC in China 

关 键 词：Ultrahigh-temperature(UHT) metamorphism.two-feldspar geothermometer perthite/mesoperthite Paleoproterozoic Khondalite belt North China craton 

摘      要：The Paleoproterozoic Khondalite belt in the North China craton preserves evidence for ultrahigh- temperature(UHT) crustal metamorphism associated with the collision of the Yinshan and Ordos *** we apply two-feldspar geothermometry to UHT granulites from two localities newly reported in this study(Tuguishan and Xuwujia) and another two localities from previous studies(Dajing /Tuguiwula and Dongpo) in the Khondalite *** presence of abundant perthite/mesoperthite in these rocks reflects post-peak slow *** minimum estimated peak metamorphic temperatures are 832-998,819-952,844-1037,and 966-1019℃computed at 8 kbar for the Dajing/Tuguiwula, Dongpo,Tuguishan,and Xuwujia areas,*** results confirm the previous report of extreme metamorphism at Dajing/Tuguiwula and Dongpo,and reveal similar conditions in the new localities reported here,suggesting that UHT metamorphism is widespread in the Khondalite belt of the North China *** study demonstrates that UHT metamorphism can be recognized using the two-feldspar geothermometry in rocks that do not possess other key UHT assemblages.