Petrology, zircon U-Pb age and geochemical characteristics of the Lhaguo Tso ophiolitic melange in Tibet

LIU Haiyong; ZENG Qinggao; WANG Yu; MAO Guozheng

2020 Vol. 39, No. 2-3

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LIU Haiyong, ZENG Qinggao, WANG Yu, MAO Guozheng. Petrology, zircon U-Pb age and geochemical characteristics of the Lhaguo Tso ophiolitic melange in Tibet[J]. Geological Bulletin of China, 2020, 39(2-3): 164-176.

Citation:

LIU Haiyong, ZENG Qinggao, WANG Yu, MAO Guozheng. Petrology, zircon U-Pb age and geochemical characteristics of the Lhaguo Tso ophiolitic melange in Tibet[J]. Geological Bulletin of China, 2020, 39(2-3): 164-176.

Petrology, zircon U-Pb age and geochemical characteristics of the Lhaguo Tso ophiolitic melange in Tibet

1.
College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, Sichuan, China
2.
Tibet Institute of Geological Survey, Lhasa 850000, Tibet, China
3.
Tibet Bureau of Geological and Mineral Exploration and Development, Lhasa 850000, Tibet, China
4.
Western Exploration Group, Tibet Bureau of Geology and Mineral Exploration and Development, Doilung 851400, Tibet, China

More Information

Corresponding author: MAO Guozheng, 372806851@qq.com

Received Date: 03 November 2018

Revised Date: 28 May 2019

Publish Date: 15 March 2020

Abstract

Abstract

Lhaguo Tso ophiolite is one of the most complete ophiolite combinations in the Shiquanhe-Namco-Lhari suture zone in central Tibetan Plateau, and has great significance for restoring the evolution of ocean.This paper reports petrology, zircon U-Pb chronology and geochemical characteristics of the diabases and plagiogranites to confirm the genesis and tectonic setting of Lhaguo Tso ophiolites.The zircon U-Pb dating of plagiogranite yielded an age of 167.8±1.7 Ma (n=24, MSWD=0.22), which indicates that the Lhaguo Tso ophiolite was formed in Late Jurassic.Geochemically, the gabbros and the diabases are similar to the island arc rocks and E-MORB, suggesting a continental back-arc basin environment setting.
- Tibetan Plateau /
- Lhaguo Tso ophiolite /
- Late Jurassic /
- back-arc basin /
- zircon U-Pb dating

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References

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