【摘要】 2001年7-8月,国家重点基础研究发展规划项目(973)的二级课题《中国边缘海前新生代基底特征及其构造格局》与两岸合作课题《南海东北部与台湾间的构造及地球物理研究》合作在南海东北部地区开展了重、磁、震资料的海上采集航次,获取了大量珍贵数据,其中973NH-01与MLTW测线垂直穿越了南海东北部传统意义上的磁静区。以这两条测线的重磁资料为主,结合地震解释剖面,对磁静区的重磁异常特征、重磁基底及深部构造进行了深入的分析和研究,并结合前人工作对磁静区的成因模式提出了新的解释,认为磁静区位于南海北部被动大陆边缘的洋陆交界带(COB),独特的动力构造背景导致其下伏的地幔高热物质上涌并沿构造薄弱带侵入成岩墙,进而造成区域居里面抬升,磁性层减薄,磁异常减弱而形成磁静区。更多还原

【Abstract】 During July to August,2001,cooperated by Nationa 1973 Project《Early Cenozoic basement structure and its conformation pattern of Chinese marginal sea》 and intercoastal cooperating project《Structure and geophysical research between northeast South China Sea and Taiwan》,survey voyage 2001 was carried out on northeast South China Sea and a great deal of geophysical data including gravity、magnetic and seismic data was acquired.We analyzed and studied the feature of gravity and magnetic anomaly and deep structure of Magnetic Quiet Zone(MQZ),combining the predecessor’s work,then it gave out a new explaination to the genetic model of MQZ.MQZ locates on the Continent-Ocean Boundary(COB),the passive margin of South China Sea,particular dynamic background led to uplifting of underground high temperature matters of upper mantle,intruding the structural weak belt,uplifting the Curie interface,thinner the magnetic layer,and then MQZ formed.更多还原