摘要
根据大地电磁测深调查结果，编制了中国大陆３０，９０，１５０ｋｍ三个深度的电阻率图以及壳内低阻层和上地幔低阻层的顶面深度图。在９０ｋｍ深度的电阻率图上发现了一个自松辽盆地直到扬子地台西南缘的北东－南西向巨大低阻异常带．１５０ｋｍ深度的电阻率图上显示出在低阻的背景上镶嵌着一些高阻块体．中国大陆的壳内低阻层深度国基本上反映了地温场的特征，壳内低阻层上隆区基本上对应于高地温区．中国大陆的上地幔低阻层深度变化大．最浅处仅５０－６０ｋｍ，大多位于构造活动地区；最深处达２００ｋｍ以上，大部分对应于稳定地区．中国大陆的上地幔低阻层平均深度为１００－１２０ｋｍ，东部浅，西部深。
According to the collected results of deep magnetotelluric sounding(MTS) data, complied the resistivity map at the depth of 30,90, 150 km, and the top-depth map of low resistivity layer in upper mantle and crust. On the resistivity map of 90 km depth, discovered a massive anomalous of low resistivity zone, which run from north east to south west from Songliao basin to west southern fringe of Yangzi platform. On the resistivity map of 150km depth, displayed some high resistivity masses inlaid in the low resistivity background. The depth variations of low resistivity layer in upper mantle was lange, the shallowest depth only 50-60 km, which mostly at active tectoneic bellt; and the deepest depth more than 200 km ,which mostly corresponding to the stable region. The average depth of low resistivity layer in upper mantle of China was 100-120 km, shallower on east and deepper on west. The top depth map of low resistivity layer intracrust represented the characteristic of geothermal field basically, and the upwarping region of intracrust low resistivity layer corresponding to the high geothermal region.
出处
《地球物理学报》
SCIE
EI
CAS
CSCD
北大核心
1996年第S1期130-140,共11页
Chinese Journal of Geophysics
基金
地质矿产部资助
关键词
中国大陆
大地电磁测深
电阻率
壳内低阻层
上地幔低阻层
Continent in China, Magnetotelluric sounding, Resistivity, Intracrust low resistivity layer, Low resistivity layer in upper mantle
