Genesis of highly fractionated S-type granites: Evidence from zircon U-Pb age, Hf isotopes and geochemistry of Fuquanshan pluton, Northeastern Jiangxi Province

XU Wentan; ZHANG Xuehui; ZHANG Binbin; LYU Jinsong; SUN Jiandong; ZHANG Yong; WU Bin

doi:10.12097/j.issn.1671-2552.2022.04.005

2022 Vol. 41, No. 4

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XU Wentan, ZHANG Xuehui, ZHANG Binbin, LYU Jinsong, SUN Jiandong, ZHANG Yong, WU Bin. Genesis of highly fractionated S-type granites: Evidence from zircon U-Pb age, Hf isotopes and geochemistry of Fuquanshan pluton, Northeastern Jiangxi Province[J]. Geological Bulletin of China, 2022, 41(4): 577-589. doi: 10.12097/j.issn.1671-2552.2022.04.005

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XU Wentan, ZHANG Xuehui, ZHANG Binbin, LYU Jinsong, SUN Jiandong, ZHANG Yong, WU Bin. Genesis of highly fractionated S-type granites: Evidence from zircon U-Pb age, Hf isotopes and geochemistry of Fuquanshan pluton, Northeastern Jiangxi Province[J]. Geological Bulletin of China, 2022, 41(4): 577-589. doi: 10.12097/j.issn.1671-2552.2022.04.005

Genesis of highly fractionated S-type granites: Evidence from zircon U-Pb age, Hf isotopes and geochemistry of Fuquanshan pluton, Northeastern Jiangxi Province

1.
College of Earth Sciences, Institute of Disaster Prevention, Sanhe 065201, Hebei, China
2.
Nanjing Center, China Geological Survey, Nanjing 210016, Jiangsu, China
3.
East China Geoscience and Technology Innovation Center, CGS, Nanjing 210016, Jiangsu, China
4.
Hubei Shenlong Geological Engineering Investigation Institute Co., Ltd., Wuhan 430100, Hubei, China

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Corresponding author: ZHANG Xuehui, zhangxuehui35@qq.com

Received Date: 08 March 2021

Revised Date: 15 August 2021

Publish Date: 25 April 2022

Abstract

Abstract

Fuquanshan pluton is located in the Wannian-Dexing metallogenic belt within Qinzhou-Hangzhou belt, and it is also an important part of regional large volume of granitic magma.In this paper, we studied the geochronology, Hf isotopes and geochemistry of Fuquanshan pluton.Zircon LA-ICP-MS U-Pb dating yield the age of around 130 Ma, suggesting this pluton emplaced at Early Cretaceous.The geochemistry features of these rocks are rich in Si, Al, alkali and have low content of REE, implying they belong to high potassium calc alkaline series and peraluminous rocks (A/CNK>1.1).Combined with the characteristics of obvious negative Eu anomaly, high content of Rb, low content of Sr and Ba, low ratios of Nb/Ta (5.14~5.52) and Zr/Hf (31.22~39.09), depletion of high field strength elements (Nb, Ga, Y), we propose this pluton is highly fractionation S-type granite.Futhermore, the ε_Hf(t) values of zircons range from -5.47 to -1.51 with t_DM2 values from 1255 Ma to 1668 Ma, implying the magma source is Mesoproterozoic lower-crust metasedimentary rocks.Comprehensive analysis shows that the Fuquanshan granite has the same tectonic setting as contemporary A-type granite in the region, and they generated by partial melting of Mesoproterozoic lower-crust metasedimentary induced by upwelling of asthenosphere in an extensional environment resulted from subduction of the paleo-Pacific plate to South China.
- Early Cretaceous /
- S-type granite /
- zircon U-Pb dating /
- Hf isotopes /
- geochemistry /
- Northeast Jiangxi Province /
- geological survey engineering

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References

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