Electrical Imaging Across Eastern South China: New Insights into the Intracontinental Tectonic Process During Mesozoic
Zhang, Kun Wan, Zhaohong Ma, Xingzhi Yang, Yufan Hu, Hao
Zhang, Kun
Wan, Zhaohong
Ma, Xingzhi
Yang, Yufan
Hu, Hao
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Department
Machine Learning
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Journal article
Date
2025
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English
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Abstract
To further investigate the collision process and tectonic regime transition between the North China (NCB) and South China Block (SCB), two magnetotelluric profiles were arranged across the Dabie Orogeny Belt (DOB) and eastern SCB. We then obtain the lithospheric resistivity models. The prominent feature revealed by our new model is an extensive conductive arc from the lower crust to the upper mantle, across the Jiangnan orogenic belt (JNOB) and the eastern Cathaysia Block (CAB). In addition, a huge resistor beneath the conductive arc is revealed, which is separated by a conductive wedge. Combining the heat flow and seismic tomographic imaging results, the conductors are to contain a large amount of hot material that present as the detachment layers (belts) controlled by the two subduction slabs. Considering multi-phase magmatism in the study area, new models suggest an intracontinental tectonic event in eastern CAB. Therefore, we propose a reliable tectonic process that occurred in the study area, including five stages: (1) an eastward intracontinental subduction and orogen carried out in CAB before the collision between SCB and NCB; (2) an extensional structural developed in CAB, following the subduction slab wrecking/sinking; (3) after the collision with NCB, the SCB crust/lithosphere thickened following the westward subduction of the Paleo-Pacific plate; (4) following the westward Yangtze slab sinking, the regional extension developed with the asthenosphere upwelling beneath SCB; (5) afterwards, the SCB was welded into one continent in a setting of westward compression.
Citation
K. Zhang, Z. Wan, X. Ma, Y. Yang, and H. Hu, “Electrical Imaging Across Eastern South China: New Insights into the Intracontinental Tectonic Process During Mesozoic,” Minerals 2025, Vol. 15, Page 1035, vol. 15, no. 10, p. 1035, Sep. 2025, doi: 10.3390/MIN15101035
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Minerals
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Keywords
Magnetotelluric, Tectonic-Magmatism Process, The South China Block, Intracontinental Tectonic
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MDPI