Geochemistry, Geochronology, Sr-Nd Isotopic Compositions of Jiang Tso Ophiolite in the Middle Segment of the Bangong- Nujiang Suture Zone and Their Geological Significance
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This work was financially supported by the Tibetan special foundation of China Geological Survey (No. 1212011221088 and No.1212011221087), Natural Science Foundation of China (No. 41372208 and No.41472054) and open foundation of State Key Laboratory of Ore Deposit Geochemistry, Chinese Academy of Sciences (No. 201304). Liu Hongfei, Zeng Qianggao, Huang Wei and Jiang Guangwu are thanked for their assistance during field work. We are grateful to Profs. Zhou Guoqing and Liu Weiliang for their analytical assistance. We appreciate the reviewers for their beneficial suggestions.

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    Abstract:

    The Jiang Tso ophiolite, situated in the middle segment of the Bangong- Nujiang Suture Zone, is a part of the easternmost Qieli Lake ophiolite subzone and is close to the south of Pung Lake ophiolite. The rock association of Jiang Tso ophiolite is relatively complete and is mainly composed of metamorphic peridotite, gabbro and diabase. Comparing with N-MORB, the ophiolite is high in Mg and low in Ti, K, Na, P, and is depleted in Nb, Ta, Hf, Th and enriched in Rb, Sr and Ba. Geochemical characteristics of the Jiang Tso ophiolite indicate it is of a supra-subduction zone type formed in the spreading ridge of back arc basin. The SHRIMP U-Pb dating of zircons from the gabbro yielded a weighted average age of 188.1±4.1 Ma (MSWD=1.4), indicating the Jiang Tso ophiolite was formed in the late stage of early Jurassic. The Sr, Nd isotopic compositions show that the Tethyan mantle domain is the depleted mantle (DM), with enriched mantle domain II (EM II). They have the same Sr, Nd isotopic composition with the India Ocean MORB type.

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HUANG Qiangtai, LI Jianfeng, CAI Zhourong, XIA Lianze, YUAN Yajuan, LIU Huichuan, XIA Bin.2015. Geochemistry, Geochronology, Sr-Nd Isotopic Compositions of Jiang Tso Ophiolite in the Middle Segment of the Bangong- Nujiang Suture Zone and Their Geological Significance[J]. Acta Geologica Sinica(),89(2):389-401

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History
  • Received:October 29,2014
  • Revised:February 12,2015
  • Adopted:
  • Online: April 14,2015
  • Published: