摘要
通过对南海重磁数据的重新处理,得到南海西北部自由空间重力异常图、布格重力异常图、磁异常图和化极磁异常图,并对所反映的地球物理场特征加以分析。根据重力场资料对研究区的地壳结构进行了反演计算,结果表明地壳厚度在10～38km之间,总的趋势由陆向洋逐渐减薄,对应于地壳类型从陆壳、过渡壳到洋壳的分布特征。根据磁力资料计算了居里面深度,其埋深变化于11～27km之间,在陆区居里面是下地壳顶界面和莫霍面之间的另一个物性界面,而在海区则接近于莫霍面埋深。
On the basis of processing of geophysical data on northwestern South China Sea, map of free air gravity anomalies, Bouguer gravity anomalies, magnetic anomalies, the RTP magnetic anomalies were obtained, and the characteristics of the geophysical fields in this area were analyzed. Inverted calculation was conducted on the crustal structure of the study area based on gravity data. The results show that the Moho depth varied from 38 km to 10 km from north to south, which indicates that the crust changed from continental to transitional and finally to oceanic.The Curie interface depth was calculated based on the magnetic data, and the results show that the Curie interface depth varied from 11 to 27 kin. The Curie interface ranges between the top interface of lower crust and the Moho discontinuity below the land, but is near the Moho discontinuity below the ocean.
出处
《大地构造与成矿学》
EI
CAS
CSCD
北大核心
2005年第3期364-370,共7页
Geotectonica et Metallogenia
基金
国家重点基础发展规划课题(G2000046702)
"十五"科研院所社会公益研究专项项目(编号2001DIA50041)
中国科学院重要方向项目(KZCX2-SW-117)资助.
关键词
地球物理场特征
南海西北部
莫霍面
居里面
characteristic of geophysical field
northwestern South China Sea
Moho discontinuity
Curie interface
