Zircon U-Pb ages, petrogenesis and tectonic setting of basic rocks in Gudui area, southern Tibet

YUAN He; HONG Xiuwei

doi:10.12097/j.issn.1671-2552.2022.09.008

2022 Vol. 41, No. 9

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YUAN He, HONG Xiuwei. Zircon U-Pb ages, petrogenesis and tectonic setting of basic rocks in Gudui area, southern Tibet[J]. Geological Bulletin of China, 2022, 41(9): 1589-1600. doi: 10.12097/j.issn.1671-2552.2022.09.008

Citation:

YUAN He, HONG Xiuwei. Zircon U-Pb ages, petrogenesis and tectonic setting of basic rocks in Gudui area, southern Tibet[J]. Geological Bulletin of China, 2022, 41(9): 1589-1600. doi: 10.12097/j.issn.1671-2552.2022.09.008

Zircon U-Pb ages, petrogenesis and tectonic setting of basic rocks in Gudui area, southern Tibet

YUAN He,
HONG Xiuwei^,

Liaoning Fourth Geological Team Limited Liability Company, Fuxin 123000, Liaoning, China

More Information

Corresponding author: HONG Xiuwei, hong.xiuwei@163.com

Received Date: 10 February 2021

Revised Date: 28 May 2021

Publish Date: 15 September 2022

Abstract

Abstract

The Gudui area in southern Tibet is located in the northeast section of the Himalaya belt, the south of the Yarlung Zangbo River suture zone, and the southeast of the cuomei large igneous province.The basic rocks in the area are widely distributed, mainly located in the Jurassic-Triassic strata.In order to explore the origin and structural dynamic background of basic rocks in Gudui area, zircon U-Pb chronology and rock geochemistry of basic rocks in the area are studied in this paper.The results show that the SHRIMP zircon ²⁰⁶Pb/²³⁸U isotopic dating shows that the weighted average age of diabase is 137.7±0.9 Ma, and the weighted average age of gabbro is 133.8±0.8 Ma, its formation age is early Cretaceous, which is similar to that of OIB basic rocks in Cuomei igneous Province(130~136 Ma).Rock geochemical evidence shows that the basic rocks have high TiO₂ and P₂O₅ characteristics, not Nb-Ta groove characteristics, and the trace element ratios(Ce/Zr, Zr/Nb, Zr/Y, Th/Yb)and rare earth distribution patterns are similar to those of intraplate ocean island basalt(OIB).The comprehensive study shows that the basic rocks in gudui area originated from the enriched mantle, and the basic magma was not contaminated by the crust during the upwelling process.It was formed in the intraplate tectonic environment and may be the product of the early activities of the Kerguelen mantle plume.Through this study of basic rocks in Gudui area, geological chronology and rock geochemistry evidence are provided for further understanding the genesis and tectonic background of Early Cretaceous basic rocks in the southern Tibet.
- basic rock /
- zircon U-Pb age /
- rock geochemistry /
- tectonic environment /
- Gudui area of south Tibet /
- geological survey engineering

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References

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