郯庐断裂带渤海段的深部构造特征──地壳厚度和居里面的研究结果  

THE DEEP STRUCTURE CHARACTERISTICS OF THE TAN-LU FAULT ZONE,BOHAI SEGMENT--A CASE STUDY ON THE CRUSTAL THICKNESS AND THE CURIE DEPTH

作　　者：刘光夏[1,2] 赵文俊[1,2] 张先[1,2] 

机构地区：[1]国家地震局地球物理勘探中心 [2]海南省地震局

出　　处：《长春地质学院学报》1996年第4期388-391,共4页

基　　金：地震科学联合基金

摘　　要：从居里等温面埋深和地壳厚度两方面论述郯庐断裂带渤海段的深部构造特征。根据航磁资料，运用三维磁性层反演方法，计算了研究海区居里面的深度；又根据布格重力异常资料，运用三维重力正、反演方法，计算了研究海区的地壳厚度。参考了地热和壳幔电性结构的有关数据，提出了对郯庐断裂渤海段深部构造特征的认识：①向东陡倾斜，这是居里面埋深和地壳厚度两个较为一致的结果；②分段性明显，显示了沿断裂带新生代以来地壳动力学特征是不同的。郯庐断裂在渤海可以分成三段，即渤海中段，居里面最浅（１３ｋｍ），地壳厚度最薄（２５ｋｍ），地壳运动以拉张为主；辽东湾段，居里面深度１６～１７ｋｍ，地壳厚度２８～３０ｋｍ；莱州湾段，居里面深度２０ｋｍ，地壳厚度３０～３２ｋｍ。The authors of this paper discuss the deep structure characteristics of the Bohai Segruent of the TanLu fault in two aspects, e.g. the burried depth of the Curie isothermal surface and the crustal thickness. With the help of the aeromagmetis data, the authors calculated the depth of Curie in the studied marine area using the method of 3D magnetic stratum inversion, with the help of the Bouguer anomaly data, we calculated the crustal thickness in the studied marine area using the method of 3D gravity forward inversion calculation. Based on the data about we proposed the geothermal and the electrical structure of the crust/mantle as followings:①dipping toward east steeply,②clearly segmented showing the difference on the crustal geodynamics since Cenozoic Era.The TanLu Fault can be divided into three segments in Bohai Sea,e.g.,①Bozhaing segment which Curie surface are crustal thickness are the thinnest 13 km,and 25 km respectively,its crustal movement is extension in brief.②Liaodong Bay segment,the depth of Curie surface is 16-17 km crustal thickness is 28-30 km.③Laizhou Bay segment,the depth of Curie surface is 20 km,its crustal thickness is 30-32 km.

关 键 词：郯庐断裂带 渤海段 深部构造 地壳厚度 

分 类 号：P542.5[天文地球—构造地质学]