文献类型：期刊文献

英文题名：The noble gas isotope geochemical composition of chert at the bottom of Cambrian in Tarim Basin, China

作者：Sun ShengLi[1];Chen JianFa[2,3];Zheng JianJing[4];Liu WenHui[4]

机构：[1]Guangdong Ocean Univ, Monitoring Ctr Marine Resource & Environm, Zhanjiang 524088, Peoples R China;[2]Changjiang Univ, Dept Geochem, Jinzhou 434023, Peoples R China;[3]Petr Univ, Coll Resource & Informat, Beijing 102249, Peoples R China;[4]Chinese Acad Sci, Lanzhou Inst Geol, Lanzhou 730000, Peoples R China

年份：2009

卷号：52

期号：SUPPL. 1

起止页码：115

外文期刊名：SCIENCE IN CHINA SERIES D-EARTH SCIENCES

收录：SCI-EXPANDED(收录号：WOS:000268229100014)、、EI(收录号：20100712707321)、Scopus(收录号：2-s2.0-76249087199)、WOS

基金：Supported by the National Basic Research Program of China (Grant No. G1999043306)

语种：英文

外文关键词：Tarim Basin; Cambrian; chert; rare gas isotope

外文摘要：In the Tarim Basin, black shale series at the bottom of Cambrian is one of the important marine facies hydrocarbon source rocks. This research focuses on the analysis of the isotope of noble gas of 11 cherts. The R/R-a ratio of chert in the Keping area is 0.032-0.319, and Ar-40/Ar-36 is 338-430. In Quruqtagh the R/R-a ratio is 0.44-10.21, and Ar-40/Ar-36 is 360-765. The R/R-a ratio of chert increases with Ar-40/Ar-36 from the west to the east accordingly. They have evolved from the crust source area to the mantle source area in a direct proportion. Surplus argon Ar-40(E) in chert is in direct proportion to the R/R-a. ratio, indicating that it has the same origin of excess argon as in fluid and mantle source helium. Comparison of the R/R-a ratios between the west and the east shows that the chert in the eastern part formed from the activity system of the bottom hydrothermal venting driven by the mantle source, where the material and energy of crust and mantle had a strong interaction in exchange; whereas in the western part, chert deposited from the floating of hydrothermal plume undersea bottom, which is far away from the Centre of activities of the hydrothermal fluid of ocean bottom. In addition, from noble gas isotope composition of chert, it is suggested that the ocean anoxia incident happened at the black shale of the Cambrian bottom probably because of the large-scaled ocean volcanoes and the following hydrothermal activities.