摘要
南海海盆区的磁异常（△T）具有明显的叠加性，并可有效地分离为浅源和深源两种异常。浅源异常的磁源体埋深稳定在5km左右，正演拟合计算表明是由层2A引起，与大洋扩张磁条带模型的可对比性更佳。受此启迪，提出应以浅源异常作为鉴别磁条带序列的依据，并开发了相应的解释方法，从而为解决南海（特别是西南次海盆）的扩张时代问题奠定了基础。
The magnetic anomalies (△T) in the Central Basin of the South ChinaSea have distinct superimposition, and can be effectively divided into two types:shallow and deep magnetic anomalies. Buried depth of magnetic source of shallowmagnetic anomaly is stably nearby 5km below sea level. The result of contrastbetween positive calculation and magnetic lineations model of sea-floor spreadingshows that the magnetic anomaly caused by layer 2A is more effective. Therefore, theauthor suggests that the shallow magnetic anomaly offer the scientific basis fordistinguishing magnetic lineations succession, developes a corresponding interpretationmethod, and thus lays a solid foundation for determining sea-floor spreading time ofthe Central Basin (especially the Southwest Subbasin) in the South China Sea.
出处
《热带海洋》
CSCD
1999年第2期39-47,共9页
关键词
南海
磁条带
浅源磁异常
深源磁异常
地磁
South China Sea
magnetic lineation
shallow magnetic anomaly
deepmagnetic anomaly
