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Oxygen isotope compositions of eclogites in Rongcheng,Eastern china

chinese Science Bulletin 2003年第4期48卷 372-378页

作者： chu xuelei1,2. guo jinghui1,{2.,2.& jin chengwei1 1. institute of geology and geophysics, chinese academy of sciences, beijing 10002., china 2. Key Laboratory for Mineral Resources Research, chinese academy of sciences, beijing 100101, china Correspondence should be addressed to chu xuelei institute of {1. and {2. Chinese Academy of Sciences Beijing 100029 China Key Laboratory for Mineral Resources Research Chinese Academy of Sciences Beijing 100101 China

Collected from the Rongcheng region, Shan-dong Province, the three types of eclogites suffering the UHP (i.e. ultra-high pressure) metamorphism have obviously dif-ferent oxygen isotope compositions. The eclogites occurring in regional orthogneisses and ultramafic rocks have the oxy-gen isotope compositions of normal eclogites in the world,but the eclogites existing in marbles are extremely enrichedin 1.O. By applying oxygen isotope geothermometry, for theall types of eclogites, the temperature estimates of quartz-garnet pair, in principle, indicate the formation temperatures of eclogites, so that the peak-metamorphic temperatures are estimated to be averagely little higher than 800℃, which are consistent with the estimates by using other geothermome-ters according to cation partitioning between coexistingphases. The d 1.O values of eclogitic inclusions hosted inmarbles from Yangguantun, Rongcheng region, are farhigher than the values of eclogites (including eclogitic inclu-sions in marbles) from the Dabieshan and other places of the Sulu. The oxygen isotope compositions of various mineralsindicate that the formation temperatures of eclogites fromthe Rongcheng region, in general, are higher than that from the Dabieshan and the southwestern part of the Sulu, but the dispersive temperatures estimated by different mineral pairs probably reflect that the UHP eclogites from the Rongcheng region generally suffered overprinted metamorphisms dur-ing the exhumation.

关键词：苏鲁超高压变质带 UHP 山东荣成榴辉岩氧同位素成分

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Oxygen isotope compositions of eclogites in Rongcheng,Eastern china

Oxygen isotope compositions of eclogites in Rongcheng,Easter...

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中国科学院地质与地球物理研究所2.03学术年会

作者： chu xuelei~(1,2.,{2. jinghui~(1,2.,fan hongrui~(1,2. & jin chengwei~1 1.institute of geology and geophysics.chinese {12. of sciences, beijing 10002.,china: 2.Key Laboratory for Mineral Resources Research.chinese {12. of sciences,beijing 100101,china Correspondence should be addressed to chu xuelei

Collected from the Rongcheng region,Shandong Province,the three types’of eclogites suffering the UHP (***-high pressure)metamorphism have obviously different oxygen isotope *** eclogites occurring in regional orthogneisses and ultramafic rocks have the oxygen isotope compositions of normal eclogites in the world, but the eclogites existing in marbles are extremely enriched in *** applying oxygen isotope geothermometry,for the all types of eclogites,the temperature estimates of quartzgarnet pair,in principle,indicate the formation temperatures of eclogites,so that the peak-metamorphic temperatures are estimated to be averagcly little higher than 800℃,which are consistent with the estimates by using other geothermometers according to cation partitioning between coexisting ***δO values of eclogitic inclusions hosted in marbles from Yangguantun,Rongcheng region,are far higher than the values of eclogites(including eclogitic inclusions in marbles)from the Dabieshan and other places of the *** oxygen isotope compositions of various minerals indicate that the formation temperatures of eclogites from the Rongcheng region,in general,are higher than that from the Dabieshan and the southwestern part of the Sulu,but the dispersive temperatures estimated by different mineral pairs probably reflect that the UHP eclogites from the Rongcheng region generally suffered overprinted metamorphisms during the exhumation.

关键词： Sulu UHP terrain eclogite oxygen isotope formation temperature overprinted metamorphism

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