Tectonic boundaries in the South China Sea from aeromagnetic signature  

作　　者：Yao LUO Hang YIN Qiang LIU Jingmin LI Shihua LIU Wei GAO Rui LI Yi YANG 

机构地区：[1]China Aero Geophysical Survey and Remote Sensing Center for Natural Resources,Beijing 100083,China

出　　处：《Journal of Oceanology and Limnology》2023年第2期550-561,共12页海洋湖沼学报（英文）

基　　金：Supported by the Geological Survey Project of China(Nos.DD20191001,DD20191004,DD20189410);the National Key R&D Program of China(No.2017YFC0602000)。

摘　　要：Magnetic data has been widely applied in the tectonic division.High-resolution magnetic data were used to analyze the geotectonic zoning of the South China Sea.Based on the newly compilated magnetic data,the processing results and the distribution of known faults,we consider that the U-shaped line approximately along the South China Sea national boundary of China shown in the magnetic map is a significant geological and geophysical boundary.We first described the linear characteristics of the magnetic data and then applied pseudo-gravity,Euler deconvolution,tilt derivatives,and the texture segmentation method to process the data.Results show that the dividing line between the South China Sea and the surrounding blocks is approximately along this U-shaped line.The dividing line between the South China domain and the South China Sea domain is along with the Dongsha Islands to Xisha Trough,which is different from the previous geophysical zoning results.Our results are almost consistent with those of the gravity data indicating roughly the tectonic zonation along the U-shaped line.

关 键 词：South China Sea U-shaped line tectonic zoning aeromagnetic map texture segmentation 

分 类 号：P736[天文地球—海洋地质]