广东莲花山断裂带北段中侏罗世褶皱及其构造意义

邓飞; 黄雨; 孙万财

doi:10.3799/dqkx.2024.153

Volume 50 Issue 5

May 2025

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Deng Fei, Huang Yu, Sun Wancai, 2025. Middle Jurassic Folds in Northern Lianhuashan Fault Zone in Guangdong Province and Its Tectonic Significance. Earth Science, 50(5): 1884-1898. doi: 10.3799/dqkx.2024.153

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Deng Fei, Huang Yu, Sun Wancai, 2025. Middle Jurassic Folds in Northern Lianhuashan Fault Zone in Guangdong Province and Its Tectonic Significance. Earth Science, 50(5): 1884-1898. doi: 10.3799/dqkx.2024.153

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Middle Jurassic Folds in Northern Lianhuashan Fault Zone in Guangdong Province and Its Tectonic Significance

doi: 10.3799/dqkx.2024.153

Deng Fei^{1, 2
,
,},
Huang Yu¹,
Sun Wancai²

1.
College of Civil Engineering, Tongji University, Shanghai 200092, China
2.
Foshan Geological Bureau of Guangdong Province, Foshan 528000, China

Received Date: 2024-09-29
Available Online: 2025-06-06
Publish Date: 2025-05-25

Abstract

Abstract

In order to limit the timing of Mesozoic folds in the eastern coast of South China and study the formation mechanism, in this paper it studies the folds of the Late Triassic to Middle Jurassic strata in the northern section and analyzes the geochronology of related geological bodies. Fossils of ferns, pinnules, bivalves found in the strata confirm the sedimentary age from the Late Triassic to the Middle Jurassic. The NE fold is invaded by the Late Jurassic volcanic rock (zircon U-Pb age at 163-148 Ma). The NW fold is invaded by the Late Jurassic granite (zircon U-Pb age at 157-154 Ma). Combined with the previous debris zircon U-Pb age obtained in the formation (171-173 Ma), comprehensive analysis indicates that the fold was formed in the middle and late Middle Jurassic. NE fold is longitudinal bending fold, which is the product of regional NW-SE extrusion; NW fold is formed by shear fold, which is the product of NW transverse fault in the fold reverse zone. The different trending Jurassic folds in the northern section of Lianhuashan fault, Guangdong, are the tectonic response of South China block to the subduction of the Paleo-Pacific plate.
- formation mechanism,
- structural analysis,
- geochronology,
- Middle Jurassic fold,
- Paleo-Pacific plate subduction,
- tectonics

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Middle Jurassic Folds in Northern Lianhuashan Fault Zone in Guangdong Province and Its Tectonic Significance

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