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Petrology, geochemistry and geochronology of gabbros from the Zhongcang ophiolitic mélange, central Tibet: Implications for an intra-oceanic subduction zone within the Neo-Tethys Ocean
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  • 作者:Mengjing Xu (1)
    Cai Li (1)
    Wei Xu (1)
    Chaoming Xie (1)
    Peiyuan Hu (1)
    Ming Wang (1)
  • 关键词:Tibet ; Zhongcang ophiolitic mélange ; gabbro ; Shiquanhe ; Yongzhu ; Jiali ophiolitic mélange belt ; geochemistry
  • 刊名:Journal of Earth Science
  • 出版年:2014
  • 出版时间:April 2014
  • 年:2014
  • 卷:25
  • 期:2
  • 页码:224-240
  • 全文大小:6,062 KB
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  • 作者单位:Mengjing Xu (1)
    Cai Li (1)
    Wei Xu (1)
    Chaoming Xie (1)
    Peiyuan Hu (1)
    Ming Wang (1)

    1. College of Earth Science, Jilin University, Changchun, 130061, China
  • ISSN:1867-111X
文摘
In order to investigate the evolution of Shiquanhe-Yongzhu-Jiali ophiolitic mélange belt, the gabbros from new discovered Zhongcang ophiolitic mélange are studied through petrology, whole-rock geochemistry, zircon U-Pb dating and Lu-Hf isotope. The gabbros investigated in this paper contain cumulate gabbro and gabbro dike, and they have undergone greenschist-amphibolite facies metamorphism. The chondrite normalized rare earth element (REE) patterns of most of these rocks show flat types with slightly light REE (LREE) depletion and the N-MORB normalized incompatible elements diagrams indicate depletion in high field strength elements (HFSE) (Nb, Ta) and enrichment in large ion lithophile elements (LILE). These gabbros have island arc and mid-ocean ridge basalt affinities, suggesting that they were originated in an oceanic back arc basin. Whole rock geochemistry and high positive ? Nd(t) values show that these gabbros were derived from ?0% partial melting of a spinel lherzolite mantle, which was enriched by interaction with slab-derived fluids and melts from sediment. U-Pb analyses of zircons from cumulate gabbro yield a weighted mean age of 114.3±1.4 Ma. Based on our data and previous studies, we propose that an intra-oceanic subduction system and back arc basin operated in the Neo-Tethy Ocean of central Tibet during Middle Jurassic and Early Cretaceous, resembling modern active intra-oceanic subduction systems in the western Pacific.

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