江苏及邻区地壳上地幔结构研究  

Review of Study on the Crust and Upper Mantle Structure in Jiangsu Province and Its Adjacent Areas

作　　者：黄耘[1] 李清河[2] 孙业君[2] 金淑梅[2] 

机构地区：[1]中国地震局地球物理研究所,北京100081 [2]江苏省地震局,江苏南京210014

出　　处：《西北地震学报》2006年第4期369-376,共8页Northwestern Seismological Journal

基　　金：国家自然科学基金(40374033);地震联合基金(1040029);江苏省科技发展项目(BS2003053)

摘　　要：根据江苏及邻区大地构造单元和人工地震研究程度的不同，划分为下扬子地区、郯庐断裂带、大别山东段、苏鲁地块等地区，介绍了利用人工地震、天然地震层析成像及其它地球物理探测等方法对这一地区的深部构造研究结果。其中下扬子地区莫霍面的深度为28～33km，横向不均匀，由西向东逐渐减薄；大别-苏鲁地区地表超高压变质带地壳波速特征主要表现在上地壳顶部的高速层，其厚度一般小于10km；苏鲁地块地壳厚度约在32～33km之间，明显高于周边地区；大别山地区沿造山带方向莫霍面变化平缓，地壳厚度33km左右；横穿造山带方向起伏变化较大，莫霍面最深达41km左右。天然层析成像研究范围大，分辨率较低。大别苏鲁地区人工地震测深工作较深入，但调查范围较小，主要在浅层，认识相对局部，有待于面上的大范围深部结构图像研究。The research works on the crust and upper mantle structure in Jiangsu province and its adjacent areas, that is divided into the southeastern Yangzi block, the southern segment of Tancheng-Lujiang fault zone, the eastern segment of Dabie orogen and the Sulu UHPM block according to geotectonics and research level, are introduced based on the results of different research methods such as deep seismic sounding, earthquake travel time tomography and other geophysical survey. The main characteristics are summarized as following points. The depths of Moho is various from 28 km to 33 km beneath the southeastern Yangzi block with decreasing from weat to east. It exists a high velocity layer in the top of crust of Dabie-Sulu UHPM zone with thickness less than 10 kin. The thickness of crust in Sulu block is in 32-33 km, and is thicker than those in the surrounding area. For Dabie orogen, the depth of crust is about 33 km and changes gently along the direction of the orogen belt, but changes greatly across the belt with the greatest 41 km depth of Moho in some areas. The results of earthquake tomography commonly have low-resolution because of large size of research area. Many works of deep seismic sounding in Dabie-Sulu zone have been done but the work range is too small and survey layer is shallow, so more works on larger area are needed to the deep structure of crust.

关 键 词：江苏及邻区 地壳上地幔结构 人工地震 天然地震层析成像 

分 类 号：P313.2[天文地球—固体地球物理学]