Mineralogical, geochemical characteristics, and genesis of Shangdong meta-basalt in Southern Jiangxi

MA Yuxiang; LIU Shuai; DU Houfa; YAO Yue; ZHAO Liang

doi:10.12097/gbc.2024.04.046

2025 Vol. 44, No. 5

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MA Yuxiang, LIU Shuai, DU Houfa, YAO Yue, ZHAO Liang. 2025. Mineralogical, geochemical characteristics, and genesis of Shangdong meta-basalt in Southern Jiangxi. Geological Bulletin of China, 44(5): 902-920. doi: 10.12097/gbc.2024.04.046

Citation:

MA Yuxiang, LIU Shuai, DU Houfa, YAO Yue, ZHAO Liang. 2025. Mineralogical, geochemical characteristics, and genesis of Shangdong meta-basalt in Southern Jiangxi. Geological Bulletin of China, 44(5): 902-920. doi: 10.12097/gbc.2024.04.046

Mineralogical, geochemical characteristics, and genesis of Shangdong meta-basalt in Southern Jiangxi

School of Earth Sciences, East China University of Technology, Nanchang 330013, Jiangxi, China

More Information

Corresponding author: LIU Shuai, Liushuai7821@163.com

Received Date: 24 April 2024

Revised Date: 18 June 2024

Publish Date: 15 May 2025

Abstract

Abstract

Objectives
The recently discovered meta−basalt in Shangdong, southern Jiangxi Province, is situated at the southern margin of the Cathaysia Caledonian fold belt. Investigating its petrogenesis and tectonic setting of formation is crucial for elucidating the tectonic nature of the South China Caledonian fold belt.
Methods
This study focuses on the Shangdong meta−basalt, employing a comprehensive approach combining mineralogical observations and detailed geochemical analyses to constrain its geological history.
Results
Mineralogical examination reveals that the Shangdong meta−basalt is primarily composed of hornblende, plagioclase, pyroxene, and biotite. Geochemical data indicate that it belongs to the sub−alkaline tholeiite series, characterized by moderate Mg^# values (40.44~45.16), a distinct Na−rich/K−poor signature (K₂O/Na₂O=0.07~0.16), moderate enrichment of light rare earth elements, negligible Eu anomalies (Eu=1.03~1.11), and notable depletion in Sr, Nb, and Ta despite relative Nb enrichment. Mineral−specific analyses further demonstrate that pyroxene is a Mg−Ca−rich augite with a crystallization temperature of 1184 °C; biotite is ferrobiotite, crystallizing at 660 °C and exhibiting high Al and Fe contents with low Mg and K; hornblende is a Ca−rich, Ti−poor, Fe−Al−enriched common hornblende within the calcic amphibole group, crystallizing at 594°C; and plagioclase is a Ti−poor, Na−Al−rich andesine−oligoclase.
Conclusions
Collectively, these findings suggest that the Shangdong meta−basalt formed under high−temperature and high oxygen fugacity conditions, originating from a magma generated by crust−mantle mixing. Its geochemical and mineralogical features are indicative of an island arc tectonic setting, strongly implying that the South China region experienced a subduction−related tectonic regime during the Early Paleozoic Caledonian orogeny.
- meta−basalt /
- mineralogy /
- geochemistry /
- petrogenesis /
- Shangdong in Southern Jiangxi

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References

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