Geophysical research on distribution features of magnetic basements in the South China Sea
南海磁性基底分布特征的地球物理研究

We have studied the macro-distribution of magnetic basements in the South China Sea (SCS) based on the latest magnetic data and physical property analysis of rocks. The density and magnetic susceptibility structures along a profile across the SCS were inverted as the constraint to the whole region. The effects of different Reduction To Pole (RTP) methods in low-latitude areas were studied and applied to magnetic data of the study area. The Halo wavelet was used in multi-scale analysis of RTP magnetic data of the SCS. The result shows that the SCS can be divided into five zones according to the characteristics of magnetic anomalies. The northern margin of the SCS is more like a non-vocanic continental margin from the results of magnetic basement inversion and the profile inversion. In the Yinggehai area, the control effect of the magnetic basement to the sedimentary layers is obvious. The characteristics of the magnetic basements of the Zhongsha-Xisha block and Nansha block are very analogous. We infer that they might be of one block before extension of the sea basin.