关于西沙海槽正磁异常带的地球物理认识
Progress in Geophysics（2009）
Abstract
南海北部西沙海槽存在东西向正磁异常带,长约350 km,前人推测为基性或超基性物质反磁化的反映.通过对西沙海槽大比例尺高精度航磁资料分带化极处理和反演拟合,发现西沙海槽正磁异常带由海槽北缘隐伏强磁性体斜磁化引起.磁性体埋深超过9 km,推测是残留洋壳(蛇绿岩),为海南岛昌江—琼海断裂带或海南岛九所—陵水断裂带所代表的缝合带在南海北部的延伸段.
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Key words
sutural zone,aeromagnetic data,residual oceanic crust,Xisha trough,reverse magnetic induction
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