Genesis of the gneissic biotite granite in Lanhe, northern Guangdong: Constraints from zircon U–Pb geochronology, Hf isotopes, and geochemistry
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 geoch...
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Institute of Geomechanics, Chinese Academy of Geological Sciences
2025-03-01
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| Series: | Dizhi lixue xuebao |
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| Online Access: | https://journal.geomech.ac.cn//article/doi/10.12090/j.issn.1006-6616.2024137 |
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| author | WANG Haiyang ZHONG Fujun PAN Jiayong XIA Fei CHEN Zhengle LI Wenli LIU Jungang SUN Yue YAN Jie QI Jiaming |
| author_facet | WANG Haiyang ZHONG Fujun PAN Jiayong XIA Fei CHEN Zhengle LI Wenli LIU Jungang SUN Yue YAN Jie QI Jiaming |
| author_sort | WANG Haiyang |
| collection | DOAJ |
| description | 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 εHf(t) values of the samples are all negative (–11.8 to –5.2), with corresponding tDM2 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. |
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| institution | Kabale University |
| issn | 1006-6616 |
| language | zho |
| publishDate | 2025-03-01 |
| publisher | Institute of Geomechanics, Chinese Academy of Geological Sciences |
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| spelling | doaj-art-df9efb8dceb44972b18afb54bf70ce382025-08-20T03:29:58ZzhoInstitute of Geomechanics, Chinese Academy of Geological SciencesDizhi lixue xuebao1006-66162025-03-0131353955610.12090/j.issn.1006-6616.2024137Genesis of the gneissic biotite granite in Lanhe, northern Guangdong: Constraints from zircon U–Pb geochronology, Hf isotopes, and geochemistryWANG HaiyangZHONG FujunPAN Jiayong0XIA FeiCHEN Zhengle1LI Wenli2LIU Jungang3SUN Yue4YAN Jie5QI Jiaming6State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, Jiangxi, ChinaInstitute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, ChinaJiangxi University of Applied Science, Gem Mineral Resources College, Nanchang 330100, Jiangxi, ChinaBeijing Research Institute of Uranium Geology, CNCC, Beijing 100029, ChinaState Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, Jiangxi, ChinaState Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, Jiangxi, ChinaNo. 290 Research Institute, CNCC, Shaoguan 512026, Guangdong, ChinaObjective 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 εHf(t) values of the samples are all negative (–11.8 to –5.2), with corresponding tDM2 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.https://journal.geomech.ac.cn//article/doi/10.12090/j.issn.1006-6616.2024137lanhe plutonzircon u–pb datinggeochemistrygranitetectonic environment |
| spellingShingle | WANG Haiyang ZHONG Fujun PAN Jiayong XIA Fei CHEN Zhengle LI Wenli LIU Jungang SUN Yue YAN Jie QI Jiaming Genesis of the gneissic biotite granite in Lanhe, northern Guangdong: Constraints from zircon U–Pb geochronology, Hf isotopes, and geochemistry Dizhi lixue xuebao lanhe pluton zircon u–pb dating geochemistry granite tectonic environment |
| title | Genesis of the gneissic biotite granite in Lanhe, northern Guangdong: Constraints from zircon U–Pb geochronology, Hf isotopes, and geochemistry |
| title_full | Genesis of the gneissic biotite granite in Lanhe, northern Guangdong: Constraints from zircon U–Pb geochronology, Hf isotopes, and geochemistry |
| title_fullStr | Genesis of the gneissic biotite granite in Lanhe, northern Guangdong: Constraints from zircon U–Pb geochronology, Hf isotopes, and geochemistry |
| title_full_unstemmed | Genesis of the gneissic biotite granite in Lanhe, northern Guangdong: Constraints from zircon U–Pb geochronology, Hf isotopes, and geochemistry |
| title_short | Genesis of the gneissic biotite granite in Lanhe, northern Guangdong: Constraints from zircon U–Pb geochronology, Hf isotopes, and geochemistry |
| title_sort | genesis of the gneissic biotite granite in lanhe northern guangdong constraints from zircon u pb geochronology hf isotopes and geochemistry |
| topic | lanhe pluton zircon u–pb dating geochemistry granite tectonic environment |
| url | https://journal.geomech.ac.cn//article/doi/10.12090/j.issn.1006-6616.2024137 |
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