Mineral chemistry and geochemistry of peridotites from the Zedang and Luobusa ophiolites, Tibet: Implications for the evolution of the Neo-Tethys

Qiang Li; Bin Xia; Jianfeng Li; Lianze Xia; Qiangtai Huang; Zhongyu Xia

doi:10.1007/s12583-015-0544-9

Volume 26 Issue 6

Nov 2015

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Journal of Earth Science > 2015 > 26(6): 893-910.

Qiang Li, Bin Xia, Jianfeng Li, Lianze Xia, Qiangtai Huang, Zhongyu Xia. Mineral chemistry and geochemistry of peridotites from the Zedang and Luobusa ophiolites, Tibet: Implications for the evolution of the Neo-Tethys. Journal of Earth Science, 2015, 26(6): 893-910. doi: 10.1007/s12583-015-0544-9

Citation:

Qiang Li, Bin Xia, Jianfeng Li, Lianze Xia, Qiangtai Huang, Zhongyu Xia. Mineral chemistry and geochemistry of peridotites from the Zedang and Luobusa ophiolites, Tibet: Implications for the evolution of the Neo-Tethys. Journal of Earth Science, 2015, 26(6): 893-910. doi: 10.1007/s12583-015-0544-9

Citation:

Qiang Li, Bin Xia, Jianfeng Li, Lianze Xia, Qiangtai Huang, Zhongyu Xia. Mineral chemistry and geochemistry of peridotites from the Zedang and Luobusa ophiolites, Tibet: Implications for the evolution of the Neo-Tethys. Journal of Earth Science, 2015, 26(6): 893-910. doi: 10.1007/s12583-015-0544-9

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Mineral chemistry and geochemistry of peridotites from the Zedang and Luobusa ophiolites, Tibet: Implications for the evolution of the Neo-Tethys

doi: 10.1007/s12583-015-0544-9

1.
School of Marine Sciences, Sun Yat-Sen University, Guangzhou 510006, China
2.
Qingdao Institute of Marine Geology, Qingdao 266071, China
3.
Guang zhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
4.
Department of Earth Sciences, Sun Yat-Sen University, Guangzhou 510275, China

More Information

Corresponding author: Qiang Li, doctorqiang@163.com
Received Date: 07 Jan 2015
Accepted Date: 05 Jun 2015
Publish Date: 01 Dec 2015

Abstract

Abstract

We present a new dataset on platinum group elements (PGEs), whole-rock major and trace elements, and mineral chemistry for the peridotites from the Zedang and Luobusa ophiolite suites, Tibet, in an attempt to better constrain the petrogenesis of the Zedang and Luobusa ophiolites and the tectonic evolution of the Neo-Tethys. Plots of chondrite-normalized PGE, PGE vs. Mg#, and PGE vs. Al₂O₃ suggest that the lherzolite and harzburgite from Zedang and Luobusa have similar PGE characteristics. The Zedang and Luobusa peridotites display U-shaped REE patterns and are enriched in some incompatible elements, indicative of melt-rock interaction. The PGE characteristics may be attributed to partial melting and heterogeneous melt-rock interaction. Mineral chemistry and whole rock major and trace elements data suggest that lherzolite and harzburgite from Zedang and Luobusa have similar geochemical properties. On the spinel Mg# vs. Cr# plot, the composition of the Zedang and Luobusa peridotites is consistent with both abyssal and subduction-zone peridotites. This study indicates that the Zedang and Luobusa peridotites have a similar origin and evolution path: they could have originated from a normal mid-ocean ridge environment and got refertilization in a supra-subduction zone setting.
- Zedang-Luobusa ophiolite,
- mantle peridotite,
- PGE,
- melt-rock interaction,
- Yarlung Zangbo suture zone

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References(63)

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