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SHRIMP Ion Microprobe Zircon U—Pb Age and Sm—Nd Isotopic Characteristics oof the NE Jiangxi Ophiolite and Its Tectonic Implications
摘    要:

关 键 词:蛇绿岩  锆石U-Pb年龄  钐-钕等时线  江西

SHRIMP ion microprobe zircon U-Pb Age and Sm-Nd isotopic characteristics of the NE Jiangxi ophiolite and its tectonic implications
Authors:Li Xianhua  Zhou Guoqing  Zhao Jianxin  C M Fanning  W Compston
Institution:(1) Institute of New Techniques for Geology, Chinese Academy of Sciences, 510640 Guangzhou;(2) Research School of Earth Sciences, Australian National University, 0200 Canberra, ACT, Australia;(3) Department of Earth Sciences, Nanjing University, 210008 Nanjng
Abstract:The new SHRIMP zircon U-Pb isotopic study suggests that the crystallization age of a highly fractionated magma in the NE Jiangxi ophiolite suite is 968±23 Ma. Re-calculated Sm-Nd isochron age of 955±44 Ma is within analytical errors. consistent with the zircon U-Pb age. With the exception of two anomalous Sm-Nd data, the remaining 15 analyses so far obtained for the ophiolite gaveεNd (T) values falling into a limited range from +4.3 to +6.7, indicating that the ophiolite was derived from a relatively strongly depleted mantle source. Sm-Nd isotopic systematics in some samples may have been strongly affected by post-magmatic events, such as alteration, deformation and metamorphism, resulting in anomalousεNd (T) values. Combined with published40Ar39Ar age data, it can be concluded that the collision between the Yangtze and South China Blocks occurred during 0.97-0.80 Ga. This work was financially supported by the President Grant of the Chinese Academy of Sciences.
Keywords:ophiolite  zircon U-Pb  Sm-Nd  NE Jiangxi
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