Detrital zircon U-Pb age of the Duoni Formation sandstone in Dongcuo area, Tibet, and its geological significance

WANG Xinlu; AWANG Danzeng; ZHAI Jie; SUOLANG Dandun; NI Jinhai; DENG Jiabao; JIANG Mengran; YI Jiyao

2019 Vol. 38, No. 5

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WANG Xinlu, AWANG Danzeng, ZHAI Jie, SUOLANG Dandun, NI Jinhai, DENG Jiabao, JIANG Mengran, YI Jiyao. Detrital zircon U-Pb age of the Duoni Formation sandstone in Dongcuo area, Tibet, and its geological significance[J]. Geological Bulletin of China, 2019, 38(5): 733-741.

Citation:

WANG Xinlu, AWANG Danzeng, ZHAI Jie, SUOLANG Dandun, NI Jinhai, DENG Jiabao, JIANG Mengran, YI Jiyao. Detrital zircon U-Pb age of the Duoni Formation sandstone in Dongcuo area, Tibet, and its geological significance[J]. Geological Bulletin of China, 2019, 38(5): 733-741.

Detrital zircon U-Pb age of the Duoni Formation sandstone in Dongcuo area, Tibet, and its geological significance

1.
Academy of Regional Geological Survey and Mineral Resources Exploration of Shaanxi, Xianyang 712000, Shaanxi, China
2.
No.2 Geological Party of Tibet Bureau of Geological Survey, Lhasa 850000, Tibet, China

Received Date: 17 January 2018

Revised Date: 02 January 2019

Publish Date: 15 May 2019

Abstract

Abstract

In this paper, the authors conducted some researches on U-Pb geochronology of detrital zircon of the Duoni Formation in Dongcuo area, Tibet. The grain diameter of detrital zircon is 50~180μm. The Th/U ratio is high. The Th/U ratio of 51 zircon samples is greater than 0.4, with the typical value being 0.64. So the magmatic zircon is dominant. The distribution of U-Pb age of zircon is 3261Ma, 2739~2335Ma, 1880~1750Ma, 1006~657Ma, 577~510Ma, 456~409Ma and 252~202Ma. The oldest detrital zircon age is 3261Ma. The provenance of the sediments contained residues of the earth's crust in Archean.The U-Pb age of zircon corresponds to the tectonic event of Qiangtang. So the provenance of Lower Cretaceous Formation in Dongcuo area should be Qiangtang block.
- Dongcuo area /
- detrital zircons /
- provenance /
- Duoni Formation /
- Qiangtang block

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References

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