摘要
根据前人所得卫星和航磁异常解释结果 ,作者的综合研究表明 :(1)在塔里木、四川和松辽盆地 ,地壳呈强磁性 ,至少可分为两层 ,上层磁化强度为 1A/m ,下层为 2A/m或更强一些 .在上述盆地中央 ,地幔顶部约 10km厚 ,也是强磁性的 ,此外 ,在南中国海 ,地壳和地幔顶部也是强磁性的 ,卫星磁异常的源位于上述部位 .(2 )西藏高原 ,中国东南沿海一带以及其他一些褶皱带之下 ,地壳是弱磁性的 ,磁性层在地表以下 30km以内 ,磁化强度约 0 .6 6A/m .特别要指出的是 ,在东南沿海一带 ,磁性层底面和莫霍面重合 ,而居里等温面恰在莫霍面之下 ,因此这个带可能是WasilewskyPJ等提出的“莫霍面是一个磁性界面”的一例 .
In the light of results on interpretation of satellite and aero magnetic anomalies in China acquired by former reseachers, author's synthetical studies indicatie that, (1) In areas of Tarim basin, Sichuan basin and Songliao basin, the crust is strongly magnetic, and can be divided into two sublayers at least, the upper has magnetization 1 A/m, and lower-2 A/m or more. In centre of these basins, the uppermost part of mantle, about 10km thick is also strongly magnetic. Moreover, under South China Sea, the crust and uppermost part of mantle is strongly magnetic too. The sources of satellite magnetic anomalies are located at places mentioned above. (2) The crust underlying the Xi zang (Tibet) plateau, coastal zone of south-east China and other folded belts are weakly magnetic, thick of magnetic layers in about 30km, with magnetization of 0.66A/m. Especially, in coastal zone of south-east China, the depths to the bottom of magnetic layer are coincided with Moho depths, and the Curie isotherm in just beneath the Moho interface. Therefore, this zone may be an example of “The Moho as a magnetic boundary”, as proposed by Wasilewski PJ et al.
出处
《地球物理学进展》
CSCD
2003年第1期103-110,共8页
Progress in Geophysics
