Citation: | YAN Jiayong, LÜ Qintian, LUO Fan, CHEN Anguo, YE Gaofeng, ZHANG Yongqian, ZHANG Kun, ZHAO Jinhua, ZHANG Chong, LIU Zhendong, LIU Yan. 2019. Where is Qinzhou-Hangzhou juncture belt? Evidence from integrated geophysical exploration[J]. Geology in China, 46(4): 690-703. doi: 10.12029/gc20190402 |
The suture zone between the Yangtze Paleoplate and the Cathaysia Paleoplate (called Qin-Hang junction belt) is one of the most important tectonic-magmatic-metallogenic belts in southeastern China. There is still considerable controversy over the method of dividing the location and boundary of the western section of the Qin-Hang junction belt. In order to identify and determine the boundaries of the Qin-Hang junction belt, the authors employed the large-scale satellite gravity and magnetic data in combination with the integrated processing and analysis of regional magnetotelluric and broadband seismic data. The comprehensive evaluation shows that the Qin-Hang junction belt is the southern boundary of the Jiangnan orogenic belt. The authors hold that the border is Ningbo-Jinhua-Shangrao-Ganzhou-Chenzhou-Beihai in the south and Shanghai-Huzhou-Yingtan-LinchuanPingxiang-Hengyang-Yongzhou-Guilin-Wuzhou-Qinzhou in the north. On both sides of the joint belt, both the gravity field and the magnetic field have distinct characteristics, indicating the different material compositions and basements between the Yangtze and Cathaysia plates. There are also local differences in the geophysical fields of the Qin-Hang junction belt, suggesting that the tectonic belt has undergone multiple stage magmatism and formed different combinations of metal deposits in different sections, forming a unique metallogenic belt, i.e., the Qin-Hang metallogenic belt.
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Bouguer gravity anomalies in adjacent areas and adjacent seas of the Qinhang junction belt calculated by satellite gravity based on spherical coordinates
Reduction to the pole magnetic anomalies derived from EMAG2 satellite magnetic data in adjacent areas and adjacent seas of the Qinhang junction belt
Multi-scale edge detection results of Bouguer gravity in eastern South China
Multi-scale edge detection results of EMAG2 reduction to the pole magnetic anomalies in eastern South China
Multiscale edge detection results of Bouguer anomaly by Southern China satellite gravity and regional geological map
The Qinzhou-Hangzhou juncture belt boundary determined by regional gravity and magnetism,
30 km deep apparent resistivity horizontal slice from South China magnetotelluric array exploration
Vertical slices of near-seismic tomographic velocity along A-A line
Vertical slices of near-seismic tomographic velocity along B-B' line
Vertical slices of near-seismic tomographic velocity along C-C'line