Origins of the high-amplitude magnetic anomaly zone in the northern South China Sea continental margin

Similar to the feature in the U.S. East Coast, an obvious roughly NE-SW trending high-amplitude magnetic belt (NSCSMA) appears in the northern South China Sea (SCS) continental margin, which extends from southwest Taiwan to the area about 114.5°E and 20°N. The likely cause of this magnetic high is important and interesting but still controversial. This study uses wavelet spectrum analysis, 2-D magnetic modeling, and compact inversion to constrain its causative sources. Our analysis results show the evidence indicating that the geometry and depth of the causative magnetic sources were varied along the strike of the NSCSMA (~15 km in the east and ~25 km in the west). Based on our findings and previous studies, we proposed that the major causative source of the NSCSMA could be the serpentinized upper mantle material.