Geochronology, geochemistry of lamprophyre and evidence of mantle fluid in the western part of Xiangshan uranium orefield

LIU Long; ZHANG Shuming; RAO Zehuang; ZHANG Xin; XIA Yinchu; WAN Kang; OUYANG Junyong; WU Zhichun

doi:10.12029/gc20200623002

GEOLOGY IN CHINA > 2024 > 51(3): 898-911. > DOI: 10.12029/gc20200623002

Liu Long, Zhang Shuming, Rao Zehuang, Zhang Xin, Xia Yinchu, Wan Kang, Ouyang Junyong, Wu Zhichun. 2024. Geochronology, geochemistry of lamprophyre and evidence of mantle fluid in the western part of Xiangshan uranium orefield[J]. Geology in China, 51(3): 898−911. DOI: 10.12029/gc20200623002

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Geochronology, geochemistry of lamprophyre and evidence of mantle fluid in the western part of Xiangshan uranium orefield

LIU Long^{1, 2,},
ZHANG Shuming^{2, 3, ,},
RAO Zehuang^{2, 4},
ZHANG Xin^{2, 3},
XIA Yinchu²,
WAN Kang²,
OUYANG Junyong²,
WU Zhichun^{2, 3}

1.
Gandong College, Fuzhou 344000, Jiangxi, China
2.
State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, Jiangxi, China
3.
Fundamental Science on Radioactive Geology and Exploration Laboratory, East China University of Technology, Nanchang 330013, Jiangxi, China
4.
No.261 Geological Party, Nuclear Industry Geological Bureau of Jiangxi Province, Yingtan 335001, Jiangxi, China

Funds: Supported by Natural Science Foundation of China (No.41862006, No.41802247), Startup Project of Doctor Scientific Research from Gandong College (No.122000802) and Postgraduate Student Innovation Special Fund Project in Jiangxi Province (No.YC2020–B159).

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Author Bio:
LIU Long, male, born in 1989, doctor, mainly engaged in research of foundamental geology; E-mail: 584456270@qq.com
Corresponding author:
ZHANG Shuming, male, born in 1965, professor, mainly engaged in research of uranium geology; E-mail: shmzhang@ecut.edu.cn.
Received Date: June 22, 2020
Revised Date: October 08, 2020

Graphical Abstract

Abstract

Abstract

This paper is the result of mineral exploration engineering.

Objective
Mantle−derived magma generally provied an object to reveal geodynamic evolution in the depth and uranium mineralization. The mafic dikes in the west of Xiangshan uranium deposit are regarded as a key aspect to understand the regional tectono−magmatic evolution and uranium mineralization.
Methods
In this paper, the comprehensive research of petrology, geochronology and geochemistry were carried on the lamprophyre in the west of Xiangshan uranium deposit.
Results
There are three stages of lamprophyre in this area, which are 134 Ma, 120–125 Ma and 84.5 Ma. The lamprophyre is sodium−alkaline lamprophyre and characterized with the enrichment of LILE and LREE, depletion of HFSE, and obvious negative anomaly of Ta–Nb–Ti. The lamprophyre is the product of partal melting from the source region and crystallisation differentiation, which experienced the crystallization differentiation of olivine and clinopyroxene as well as strong assimilation and contamination of upper crustal meterials during the magmatic intrusion. The lamprophyre was formed in the extentional entraplate tensioned tectonic environment, and was not affected by the subduction of the ancient Pacific Plate. The source region is a mixture of asthenospheric depleted mantle (main source) and lithospheric enriched mantle, which is mainly characterized by asthenospheric depleted mantle.
Conclusions
The first period of lamprophyres is much older than the age of uranium mineralization, only providing favorable conditions for uranium accumulation. The later two periods of lamprophyres are closely associated with uranium deposits on space and time, possibly providing mantle hydrothemal fluids (∑CO₂ and He) and a favorable reducing environment for uranium enrichment and deposition.
- geochronology,
- geochemistry,
- source characteristics,
- lamprophyre,
- Xiangshan orefield,
- mineral exploration engineering,
- Jiangxi Province
Highlights
(1) There are three stages of lamprophyre in this area, which are 134 Ma, 120–125 Ma and 84.5 Ma; (2) Lamprophyre is mainly characterized by asthenospheric depleted mantle; (3) The lamprophyre of the first stage provides favorable conditions for uranium precipitation enrichment, and the lamprophyre of the late two stages provides mantle source fluid and reduction barrier for uranium mineralization.

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References (51)

References

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Geochronology, geochemistry of lamprophyre and evidence of mantle fluid in the western part of Xiangshan uranium orefield

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