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

Mengjing Xu; Cai Li; Wei Xu; Chaoming Xie; Peiyuan Hu; Ming Wang

doi:10.1007/s12583-014-0419-5

Volume 25 Issue 2

Apr 2014

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Journal of Earth Science > 2014 > 25(2): 224-240.

Mengjing Xu, Cai Li, Wei Xu, Chaoming Xie, Peiyuan Hu, Ming Wang. 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. Journal of Earth Science, 2014, 25(2): 224-240. doi: 10.1007/s12583-014-0419-5

Citation:

Mengjing Xu, Cai Li, Wei Xu, Chaoming Xie, Peiyuan Hu, Ming Wang. 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. Journal of Earth Science, 2014, 25(2): 224-240. doi: 10.1007/s12583-014-0419-5

Citation:

Mengjing Xu, Cai Li, Wei Xu, Chaoming Xie, Peiyuan Hu, Ming Wang. 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. Journal of Earth Science, 2014, 25(2): 224-240. doi: 10.1007/s12583-014-0419-5

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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

doi: 10.1007/s12583-014-0419-5

College of Earth Science, Jilin University, Changchun, 130061, China

More Information

Corresponding author: Cai Li, licai010@126.com
Received Date: 25 Sep 2013
Accepted Date: 20 Jan 2014
Publish Date: 01 Apr 2014

Abstract

Abstract

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 ɛ_Nd(t) values show that these gabbros were derived from ~30% 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.
- Tibet,
- Zhongcang ophiolitic mélange,
- gabbro,
- Shiquanhe-Yongzhu-Jiali ophiolitic mélange belt,
- geochemistry

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References(80)

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