内蒙满都拉—广西凭祥超长剖面地壳介质密度分布及深部结构特征探榷  

Discussion on the crustal density distribution and deep crustal structure of the super-long profile from Mandula(Inner Mongolia)to Pingxiang(Guangxi)

作　　者：王谦身[1] 滕吉文[1,2] 张永谦[1,3] 陈石[4] 文武[1] 皮娇龙[1,4] 马学英[1] 

机构地区：[1]中国科学院地质与地球物理研究所,北京100029 [2]吉林大学地球探测科学与技术学院,长春130026 [3]中国地质科学院矿产资源研究所,北京100037 [4]中国地震局地球物理研究所,北京100081

出　　处：《地球物理学报》2017年第12期4681-4698,共18页Chinese Journal of Geophysics

基　　金：秦岭造山带与南鄂尔多斯盆地地壳精细结构与动力学响应(90914012);扬子克拉通壳幔结构与深层动力过程(41674102)资助

摘　　要：通过对跨越内蒙构造带、阴山造山带、华北克拉通、秦岭造山带、扬子克拉通和华南陆内造山区等几大地质构造单元即北起内蒙满都拉、向南经陕西、越秦岭、过重庆、穿贵州、直抵南端广西凭祥全长2280km超长重力探测剖面的数据进行处理分析和解释,构建了沿剖面的二维地壳密度结构模型,并详细分析了沿剖面壳内各界面与Moho界面展布的深部结构和构造特征,构划出了沿剖面主要深部断裂分布,研究分析了剖面辖区跨越的克拉通、造山带、盆山耦合带等各个不同构造单元的重力异常场、地壳密度结构、界面起伏及断裂构造分布的特征与差异.着重探讨了各构造单元之间的相互关系、相互作用等整体的系统关连性.以期能对深化认识该剖面跨越地区的特异地壳结构、各构造单元的界域与关连、以及全剖面的大陆动力学研究等,提供相关重力场的依据.In order to investigate the structure of the crust beneath the Inner Mongolia tectonic belt, the Yinshan orogen, the North China Craton, the Qinling orogen, the Yangtze Craton and the intra-continental orogens in South China, a 2280 km long gravity survey profiling was conducted from Mandula town in Inner Mongolia to Pingxiang city in Guangxi province in nearly NS direction. By using the gravity data collected, we constructed the 2D density model, analyzed the deep structure and tectonic characteristics, reliefs of the intra-crust interfaces and Moho discontinuity and major deep faults along this profile. In addition, we revealed the differences among the different tectonic units in the gravity field, density distribution, undulation of layers and so on. Finally, based on the research in these tectonic units as a whole, we discussed the correlation between the tectonic units along this profile. Our research could provide evidence of the gravity field for the further study of the crustal structure and geodynamics of the continent in central China.

关 键 词：内蒙满都拉 广西凭祥 重力场 地壳介质密度分布 地壳深部结构 

分 类 号：P312[天文地球—固体地球物理学] P541[天文地球—地球物理学]