Zircon U-Pb age and Hf isotope of Early Paleozoic granite from the Jitang area in eastern Tibet and its insight into the evolution of the Proto-Tethys Ocean

REN Fei; YIN Fuguang; XU Bo; LIU Henglin; FAN Bingliang; XU Changhao; BAI Jingguo

2021 Vol. 40, No. 11

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REN Fei, YIN Fuguang, XU Bo, LIU Henglin, FAN Bingliang, XU Changhao, BAI Jingguo. Zircon U-Pb age and Hf isotope of Early Paleozoic granite from the Jitang area in eastern Tibet and its insight into the evolution of the Proto-Tethys Ocean[J]. Geological Bulletin of China, 2021, 40(11): 1865-1876.

Citation:

REN Fei, YIN Fuguang, XU Bo, LIU Henglin, FAN Bingliang, XU Changhao, BAI Jingguo. Zircon U-Pb age and Hf isotope of Early Paleozoic granite from the Jitang area in eastern Tibet and its insight into the evolution of the Proto-Tethys Ocean[J]. Geological Bulletin of China, 2021, 40(11): 1865-1876.

Zircon U-Pb age and Hf isotope of Early Paleozoic granite from the Jitang area in eastern Tibet and its insight into the evolution of the Proto-Tethys Ocean

1.
Chengdu Center, China Geological Survey, Chengdu 610081, Sichuan, China
2.
Yiliang Chihong Mining Co., Ltd., Zhaotong 657600, Yunnan, China
3.
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, Sichuan, China
4.
Geothermal Geological Survey Party, Tibet Bureau of Geology and Mineral Exploration and Development, Lhasa 850000, Tibet, China
5.
College of Earth Sciences, Chengdu University of Technology, Chengdu 610081, Sichuan, China
6.
Sichuan Institute of Metallurgical Geology & Exploration, Chengdu 610081, Sichuan, China

Received Date: 01 May 2021

Revised Date: 04 June 2021

Publish Date: 15 November 2021

Abstract

Abstract

There is little report on the Early Paleozoic magmatic events in the Jitang area, eastern Tibet.The Middle-Late Ordovician granites have been discovered in Langla Mountain, Jitang.The weighted average U-Pb age of the granite is 455±2.0 Ma(WSWD=1.15, n=26) by the LA-ICP-MS U-Pb dating of the zircon, indicating that it was emplaced in Middle-Late Ordovician.The geochemical characteristics indicate that the granite has high SiO₂(78.72%~79.48%), high potassium(K₂O/Na₂O=5.55~10.20), low MgO(0.10%~0.25%), with aluminum supersaturated index A/CNK values ranging from 1.08 to 1.26, and the rock is a high-potassium-calcium- alkali-strong over aluminum S-type granite.The REE contents of rocks are enriched in LREE and depleted in HREE, with a negative Eu anomaly and δEu values ranging from 0.35 to 0.39.They are also enriched in LILEs (Rb, Th, Nd and Pb), but depleted in HFSEs (Ba, Nb, Sr, P and Ti).Combined with regional geological data, it is suggested that the granites might have originated from partial melting of ancient crustal materials, caused by the subduction of the Proto-Tethys, and is the response of the magmatic events during subduction of the Proto-Tethys.
- Proto-Tethys Ocean /
- Langla Mountain granite /
- zircon U-Pb dating /
- Hf isotope /
- geochemistry /
- eastern Tibet

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References

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