Genesis of the gneissic biotite granite in Lanhe, northern Guangdong: Constraints from zircon U–Pb geochronology, Hf isotopes, and geochemistry

WANG Haiyang; ZHONG Fujun; PAN Jiayong; XIA Fei; CHEN Zhengle; LI Wenli; LIU Jungang; SUN Yue; YAN Jie; QI Jiaming

doi:10.12090/j.issn.1006-6616.2024137

2025 Vol. 31, No. 3

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Article navigation > Journal of Geomechanics > 2025 > 31(3): 539-556

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WANG Haiyang, ZHONG Fujun, PAN Jiayong, XIA Fei, CHEN Zhengle, LI Wenli, LIU Jungang, SUN Yue, YAN Jie, QI Jiaming. 2025. Genesis of the gneissic biotite granite in Lanhe, northern Guangdong: Constraints from zircon U–Pb geochronology, Hf isotopes, and geochemistry. Journal of Geomechanics, 31(3): 539-556. doi: 10.12090/j.issn.1006-6616.2024137

Citation:

WANG Haiyang, ZHONG Fujun, PAN Jiayong, XIA Fei, CHEN Zhengle, LI Wenli, LIU Jungang, SUN Yue, YAN Jie, QI Jiaming. 2025. Genesis of the gneissic biotite granite in Lanhe, northern Guangdong: Constraints from zircon U–Pb geochronology, Hf isotopes, and geochemistry. Journal of Geomechanics, 31(3): 539-556. doi: 10.12090/j.issn.1006-6616.2024137

Genesis of the gneissic biotite granite in Lanhe, northern Guangdong: Constraints from zircon U–Pb geochronology, Hf isotopes, and geochemistry

1.
State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, Jiangxi, China
2.
Innovation Base for Radiometric Mineral Exploration Technology of East China, Geological Society of China, Nanchang 330013, Jiangxi, China
3.
Jiangxi University of Applied Science, Gem Mineral Resources College, Nanchang 330100, Jiangxi, China
4.
Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China
5.
Beijing Research Institute of Uranium Geology, CNCC, Beijing 100029, China
6.
No. 290 Research Institute, CNCC, Shaoguan 512026, Guangdong, China

Fund Project: This research is financially supported by the National Natural Science Foundation of China (Grant Nos. 42362011 and 42272090)

More Information

Corresponding author: PAN Jiayong, jypan@ecut.edu.cn

Received Date: 16 December 2024

Revised Date: 28 February 2025

Accepted Date: 03 March 2025

Available Online: 04 March 2025

Publish Date: 28 June 2025

Abstract

Abstract

Objective
The Lanhe pluton in northern Guangdong is located at the southeastern margin of the Zhuguangshan Complex and is primarily composed of gneissic biotite granite; its petrogenesis has not yet been determined.
Methods
This study applied LA–ICP–MS zircon U–Pb geochronology, whole-rock geochemistry, and zircon Hf isotope analyses to the Lanhe gneissic biotite granite.
Results
U–Pb dating indicates that the emplacement age of the Lanhe gneissic biotite granite is 427 ± 2 Ma, representing a product of the Caledonian magmatic activity. The geochemical characteristics show that the granite has SiO₂ contents ranging from 71.53% to 75.41%, high total alkali contents (K₂O + Na₂O = 7.57%–8.23%), and high A/CNK values (1.00–1.06). It is enriched in Rb, Th, U, and K, but depleted in Ba, Y, Nb, Ta, Sr, and Yb. The LREE/HREE ratios range from 9.49 to 28.15, with significant Eu negative anomalies (δEu = 0.21–0.76). The zircon ε_Hf(t) values of the samples are all negative (–11.8 to –5.2), with corresponding t_DM2 values of 1806–2129 Ma.
Conclusion
Based on the geochemical and isotopic characteristics, the Lanhe gneissic biotite granite is identified as a highly fractionated I-type granite, primarily formed by partial melting of crustal metasedimentary rocks, including metagraywacke and metapelite. It is likely a product of the multi-stage reworking of the Paleoproterozoic basement during the Neoproterozoic to Early Paleozoic. The comprehensive study suggests that the Lanhe gneissic biotite granite formed in a syn-collisional tectonic setting during the Early Paleozoic in South China. [Significance] Integrated with the Zhuguang magmatic system and regional geological data, the Lanhe pluton likely represents a product of the transition from compressional thickening to post-collisional extension during the Caledonian Orogeny in South China. This transition may have been associated with intracontinental tectonic reorganization or external subduction–collision processes.
- Lanhe pluton /
- zircon U–Pb Dating /
- geochemistry /
- granite /
- tectonic environment

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References

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