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

• 责任者：Wu Zhaocai (Key Laboratory of Submarine Geosciences ; Second Institute of Oceanography ; SOA ; Hangzhou 310012 ; China) ; Gao Jinyao
• 刊名：Earth Science
• 出版年：2010
• 卷期：35(6)
• 关键词：磁异常 ; magnetic anomaly ; 南海 ; South China Sea
• 页码：p.1060-1068
• 图表：5 illus., 47 refs.
• 分类号：1600
• issnNo：ISSN1000-2383
• isbnNo：CN42-1233/P

In order to investigate thermal state of crust in the northern continental margin of the South China Sea, the authors 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.