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Carbon isotopic variations of Proterozoic carbonates in Jixian, Tianjin, china

Science china Earth sciences 2004年第2期47卷 160-170页

作者： chu xuelei, ZHANG Tonggang, ZHANG Qirui, FENG Lianjun & ZHANG Fusong1. Institute of Geology and Geophysics,{2., beijing 100029, china 2. key laboratory for mineral resources research,{2., beijing 100029, china correspondence should be addressed to chu xuelei (email: xlchu@***) Institute of Geology and Geophysics Chinese Academy of Sciences Beijing China key laboratory for {2. resources research Chinese Academy of Sciences Beijing China

Along the Proterozoic stratigraphic sections of Jixian, Tianjin, the ??13C values of carbonates are mostly negative in the Changchengian (Changcheng System), varying approximately within a range of (0±1)‰ in the Jixianian (Jixian System), and have commonly positive values of (2.2.‰ in the Qingbaikouan (Qingbaikou System). From chuanlinggou Formation to Dahongyu Formation, i.e. from ca. 1700 Ma to 1600 Ma, the δ13C values of carbonates increase from about -3‰ to 0‰, but oscillate with large excursion in Dahongyu Formation. Two large excursions occur in the Jixianian, one in Yangzhuang Formation and the other in the third submember of Wumishan Formation overlaying. These integrated and continuous records of carbon isotope reflect secular variations of δ13C value in ancient seawater from ca. 1700 Ma to ca. 800 Ma. The increase and subsequent oscillation of seawater δ13C value occurring from the ages of ca. 1700 to ca. 1600 Ma and ＜1300 Ma may signify two correlative global tectonic events.

关键词： Proterozoic, Jixian, carbon isotope, chemostratigraphy, secular variation, global tectonic event.

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Oxygen isotope compositions of eclogites in Rongcheng,Eastern china

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

作者： chu xuelei1,2. GUO Jinghui1,2. FAN Hongrui1,2.& JIN Chengwei1 1. Institute of Geology and Geophysics,{2., beijing 100029, china 2. key laboratory for mineral resources research,{2., beijing 100101, china correspondence should be addressed to chu xuelei Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China key laboratory for {2. 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 18O. 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 18O 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.,GUO Jinghui~(1,2.,FAN Hongrui~(1,2. & JIN Chengwei~1 1.Institute of Geology and Geophysics.{2. academy of sciences, beijing 100029,china: 2.key laboratory for mineral resources research.{2. academy 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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