华南云开地区幕式岩浆作用与大陆再造

虞鹏鹏; 丁望; 曾长育; 柳渊; 周永章; 郑义

doi:10.3799/dqkx.2023.078

Volume 48 Issue 9

Sep. 2023

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Article Navigation > Earth Science > 2023 > 48(9): 3205-3220

Yu Pengpeng, Ding Wang, Zeng Changyu, Liu Yuan, Zhou Yongzhang, Zheng Yi, 2023. Episodic Magmatism and Continental Reworking in the Yunkai Domain, South China. Earth Science, 48(9): 3205-3220. doi: 10.3799/dqkx.2023.078

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Yu Pengpeng, Ding Wang, Zeng Changyu, Liu Yuan, Zhou Yongzhang, Zheng Yi, 2023. Episodic Magmatism and Continental Reworking in the Yunkai Domain, South China. Earth Science, 48(9): 3205-3220. doi: 10.3799/dqkx.2023.078

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Episodic Magmatism and Continental Reworking in the Yunkai Domain, South China

doi: 10.3799/dqkx.2023.078

1.
Guangdong Provincial Key Lab of Geological Processes and Mineral Resources, School of Earth Sciences and Engineering, SunYat-sen University, Zhuhai 519082, China
2.
School of Geography and Planning, Nanning Normal University, Nanning 530001, China

Received Date: 2023-03-20
Available Online: 2023-10-07
Publish Date: 2023-09-25

Abstract

Abstract

The Yunkai domain is a key area where the ancient basement of the South China Block is exposed, and it records multi-stage, complex crustal reworking processes of the South China Block. The Pangxidong area is located in the southwestern margin of Yunkai, where the ancient basement fragments of the Yunkai group quartz mica schist are outcropped. In this study, detailed field geological, petrological and chronological analyses were conducted and the high-precision zircon U-Pb ages of granitic gneiss, gneissic granite and massive biotite granite in this area were obtained at ~450 Ma, ~440 Ma and ~105 Ma, respectively, indicating that this area has experienced episodic magmatism in the Caledonian and Yanshanian. There are several sets of ages (~470 Ma, ~450-430 Ma and ~390 Ma) found in the Early Paleozoic granitic rocks, suggesting that multiple episodes of magmatic processes may have occurred during the Caledonian. In addition, zircon ages of 228-219 Ma with low Th/U (0.01-0.03) and 101-99 Ma with high Th/U (0.30-0.78) were obtained in their dark rims, recording the overprints of the Indosinian metamorphic fluids and Yanshanian magmatic fluids. The zircon saturation temperature of the Yanshanian granite (~770 ℃) in the study area is higher than that of the Caledonian granite (~740-720 ℃), which may be due to the consumption of fusible components after multiple melting of the crust, and thus, higher temperatures are required for crustal partial melting. Their age spectrum of the granitoids is consistent with that of the ancient basement of South China, and they have the characteristics of S-type granite. These indicate the granitoids are mainly the products of ancient crustal remelting with insignificant mantle-derived material. Combined with regional geological, geochronological and geochemical data, the South China Block has at least experienced Caledonian (~470-390 Ma), Indosinian (~248-200 Ma) and Yanshanian (~180-90 Ma) crustal reconstruction/overprint of metamorphic and magmatic fluids since the Phanerozoic. The partial melting of ancient crustal materials mainly occurred in the Caledonian and Indosinian with few mantle-derived magma inputs, while the crustal melting in the Yanshanian was induced by adding mantle-derived heat with or without mantle materials input.
- continental reworking,
- granite,
- zircon U-Pb geochronology,
- Caledonian,
- Yunkai domain,
- petrology,
- geochemistry

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