粤北坪田地区三叠纪A型花岗岩年代学、地球化学及其构造意义

席振; 刘清泉; 吴德华; 陈肇华

doi:10.3799/dqkx.2023.010

Volume 49 Issue 7

Jul. 2024

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Xi Zhen, Liu Qingquan, Wu Dehua, Chen Zhaohua, 2024. Geochronology, Geochemistry and Tectonic Implications of Triassic A-Type Granites in Pingtian Area, Northern Guangdong. Earth Science, 49(7): 2508-2525. doi: 10.3799/dqkx.2023.010

Citation:

Xi Zhen, Liu Qingquan, Wu Dehua, Chen Zhaohua, 2024. Geochronology, Geochemistry and Tectonic Implications of Triassic A-Type Granites in Pingtian Area, Northern Guangdong. Earth Science, 49(7): 2508-2525. doi: 10.3799/dqkx.2023.010

Citation:

Xi Zhen, Liu Qingquan, Wu Dehua, Chen Zhaohua, 2024. Geochronology, Geochemistry and Tectonic Implications of Triassic A-Type Granites in Pingtian Area, Northern Guangdong. Earth Science, 49(7): 2508-2525. doi: 10.3799/dqkx.2023.010

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Geochronology, Geochemistry and Tectonic Implications of Triassic A-Type Granites in Pingtian Area, Northern Guangdong

doi: 10.3799/dqkx.2023.010

Xi Zhen^{1, 2, 3
,
,},
Liu Qingquan^{2
,
,},
Wu Dehua¹,
Chen Zhaohua²

1.
School of Municipal and Geomatics Engineering, Hunan City University, Yiyang 413000, China
2.
Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, Central South University, Changsha, 410083, China
3.
Hunan Key Laboratory of Remote Sensing Monitoring of Ecological Environment in Dongting Lake Area, Hunan Natural Resources Affairs Center, Changsha 410004, China

Received Date: 2022-10-10
Available Online: 2024-08-03
Publish Date: 2024-07-25

Abstract

Abstract

Pingtian pluton is located in the central part of South China, providing an ideal window for understanding the Triassic tectonic-magmatic activities and the geodynamic setting in South China. Systematic whole-rock geochemistry, zircon U-Pb dating and zircon in situ Hf isotope studies were carried out, taking the Pingtian granite group as the object of study. The results show that the Pingtian pluton consists of coarse-grained porphyritic biotite granite, coarse-grained porphyritic potassium feldspar granite and medium-grained monzonite, with diagenetic ages ranging from 238 to 239 Ma, and it was formed in the Middle Triassic. Geochemical characteristics show that the rocks are enriched in light rare earth elements with obvious europium negative anomalies (δEu average=0.42). It is enriched in Zr, Hf, Y and Ce, and significantly depleted in Sr, P and Ti. It belongs to the metaluminous to weakly peraluminous alkaline granite type, and is A-type granite. The zircon ε_Hf(t) values range from -37.7 to -5.0, and the t_DM2 two-stage model ages range from 1 578 to 3 597 Ma. Combined with the whole-rock geochemical characteristics, it reveals that the magmas were derived mainly from the partial melting of felsic material in the crust under low-temperature and high-pressure environment, probably mixed with old crustal material, and experienced crystalline differentiation, and was formed in the post-collisional extensional background. Integrating the geochemical characteristics and spatial distribution of A-type granites and alkaline syenite in South China, we propose that the tectonic evolution of the Triassic was mainly controlled by the collisional interaction of the South China block with the Indochina block and the North China block, and that the tectonic setting changed at around 238 Ma, from a collisional extrusion environment in the Early Triassic to a transition to a post-collisional extensional environment in the Middle to Late Triassic.
- A-type granite,
- Middle Triassic,
- post-collision extension,
- Pingtian,
- South China,
- geochemistry

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References(109)

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Geochronology, Geochemistry and Tectonic Implications of Triassic A-Type Granites in Pingtian Area, Northern Guangdong

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