南海北部陆缘的磁异常特征及居里面深度

吴招才; 高金耀; 赵俐红; 张涛; 杨春国; 王健

doi:10.3799/dqkx.2010.120

Volume 35 Issue 6

Jun. 2010

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Article Navigation > Earth Science > 2010 > 35(6): 1060-1068

WU Zhao-cai, GAO Jin-yao, ZHAO Li-hong, ZHANG Tao, YANG Chun-guo, WANG Jian, 2010. Characteristic of Magnetic Anomalies and Curie Point Depth at Northern Continental Margin of the South China Sea. Earth Science, 35(6): 1060-1068. doi: 10.3799/dqkx.2010.120

Citation:

WU Zhao-cai, GAO Jin-yao, ZHAO Li-hong, ZHANG Tao, YANG Chun-guo, WANG Jian, 2010. Characteristic of Magnetic Anomalies and Curie Point Depth at Northern Continental Margin of the South China Sea. Earth Science, 35(6): 1060-1068. doi: 10.3799/dqkx.2010.120

Citation:

WU Zhao-cai, GAO Jin-yao, ZHAO Li-hong, ZHANG Tao, YANG Chun-guo, WANG Jian, 2010. Characteristic of Magnetic Anomalies and Curie Point Depth at Northern Continental Margin of the South China Sea. Earth Science, 35(6): 1060-1068. doi: 10.3799/dqkx.2010.120

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Characteristic of Magnetic Anomalies and Curie Point Depth at Northern Continental Margin of the South China Sea

doi: 10.3799/dqkx.2010.120

1.
Key Laboratory of Submarine Geosciences of SOA, Second Institute of Oceanography, SOA, Hangzhou 310012, China
2.
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
3.
Shandong University of Science and Technology, Qingdao 266510, China

Received Date: 2010-03-20
Publish Date: 2010-11-01

Abstract

Abstract

In order to investigate thermal state of crust in northern continental margin of the South China Sea, we calculated the Curie point depths with the shipboard magnetic anomaly by employing the method of power-density spectrum analysis. Combining with the seismic section, faults, and the heat flow distribution, the deep thermal structure was discussed in the study area. The result shows that Curie point depths were between 13 and 26 km. NE-directed faults were mostly distributed in the gradient belt of Curie point isotherm, while NW-directed faults had the features of segmentation and fragment. The correlations were apparent between the Curie point depths and heat flow data. It reveals that magnetic bodies in shelf and upper slope were mostly distributed over upper crust and upper part of lower crust; and the crust and the top of mantle in under slope and the oceanic areas were subject to magnetization. Magnetic quiet zone was located at the margin of the uplift of the Curie point isotherm. Residue ancient oceanic crusts extended from F3 fault to F4 fault. Chaoshan depression and centre uplift of the Southwest Taiwan basin were the main areas of underplating, and F2 fault was the north boundary.
- South China Sea,
- Curie pointdepth,
- spectral analysis,
- magnetic anomaly,
- heat flow

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References(77)

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Characteristic of Magnetic Anomalies and Curie Point Depth at Northern Continental Margin of the South China Sea

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