Inversion and Interpretation of Magnetic Anomalies at Northeastern Margin Basement of the South China Sea

Abstract:

Based on multi scale processing and analysis of the magnetic data of northeast continental margin of the South China Sea, the apparent magnetization of pre Mesozoic basement was calculated. Through comprehensive analysis of available drilling and seismic data, the distribution characteristics of apparent magnetization of the basement have been discussed. The northern portion of the high apparent magnetization belt may be subject to continental crust，and the southern portion with special high value may have been resulted from the reform of sub oceanic crust. In the western study area with low apparent magnetization, there is a suit of Paleozoic epizonal metamorphism rock series. Chao Shan depression and its southeast basement with negative apparent magnetization seem to be oceanic crust or quasi oceanic crust by nature.