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学科主题: Geology
题名: Age and composition of the Rebang Co and Julu ophiolites, central Tibet: implications for the evolution of the Bangong Meso-Tethys
作者: Liu, WL ; Xia, B ; Zhong, Y ; Cai, JX ; Li, JF ; Liu, HF ; Cai, ZR ; Sun, ZL
通讯作者: liuweil@mail.sysu.edu.cn ; xiabin08@outlook.com
关键词: Tibet ; Bangong Meso-Tethys ; ophiolites ; intra-oceanic subduction ; geochemistry ; geochronology
刊名: INTERNATIONAL GEOLOGY REVIEW
发表日期: 2014
卷: 56, 期:4, 页:430-447
收录类别: sci
部门归属: [Liu, Wei-Liang ; Xia, Bin ; Zhong, Yun ; Cai, Zhou-Rong] Sun Yat Sen Univ, Sch Marine Sci, Guangzhou 510275, Guangdong, Peoples R China ; [Liu, Wei-Liang ; Xia, Bin ; Zhong, Yun ; Cai, Zhou-Rong] Guangdong Univ, Key Lab Offshore Oil Explorat & Dev, Guangzhou, Guangdong, Peoples R China ; [Xia, Bin ; Li, Jian-Feng] Chinese Acad Sci, Guangzhou Inst Geochem, Guangzhou, Guangdong, Peoples R China ; [Cai, Jian-Xin] Chinese Acad Sci, Key Lab Marginal Geol, South China Sea Inst Oceanol, Guangzhou, Guangdong, Peoples R China ; [Liu, Hong-Fei] Xizang Geol Survey, Lhasa, Peoples R China ; [Sun, Zhi-Lei] Qingdao Inst Marine Geol, Key Lab Marine Hydrocarbon Resources & Environm G, Minist Land & Resources, Qingdao, Peoples R China
项目归属: 海洋地质
资助者: National Nature Science Foundation of China [41372208]; China Geological Survey [1212011221105, 1212011121259]; National Key Basic Research Programme of China [2013CB429701]
摘要: Subduction of the Bangong Meso-Tethys and collision between the Lhasa and Qiangtang blocks were important for the growth of Tibetan crust, as well as the development of super-large porphyry copper deposits in central Tibet. However, the initiation and closure timing, and nature and structure of the Bangong Meso-Tethys are still poorly constrained. Petrology, geochronology, and geochemistry of the Rebang Co and Julu ophiolites in the western part of the suture zone are used to constrain the tectonic history and structure of the Bangong Meso-Tethys. These two suites consist of ultramafic rocks, gabbro and diabase dikes, pillow basalts, and radiolarian cherts. Zircon U-Pb dating of zircon grains of gabbros yields well-defined weighted mean ages of 161.5 +/- 1.5 Ma and 103.8 +/- 3.9 Ma for the Rebang Co and Julu suites, respectively. Both of ophiolitic suites have mid-oceanic ridge basalt and island-arc tholeiite affinities, similar to back-arc basin crust. We suggest these suites formed above an intra-oceanic subduction zone at least during Middle Jurassic through mid-Cretaceous times. Along with coeval subduction beneath the southern Qiangtang margin, as well as fore-arc basin development, the Bangong Meso-Tethys has a complicated structure and history. Clearly, subduction in the Bangong Meso-Tethys was still active during mid-Cretaceous time and the Meso-Tethys did not close until Late Cretaceous time.
原文出处: 查看原文
WOS记录号: WOS:000330931500003
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/10635
Appears in Collections:中科院边缘海地质重点实验室_期刊论文

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Recommended Citation:
Liu, WL; Xia, B; Zhong, Y; Cai, JX; Li, JF; Liu, HF; Cai, ZR; Sun, ZL.Age and composition of the Rebang Co and Julu ophiolites, central Tibet: implications for the evolution of the Bangong Meso-Tethys,INTERNATIONAL GEOLOGY REVIEW,2014,56(4):430-447
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