内蒙古东乌珠穆沁旗-辽宁东沟地学断面

内蒙古东乌珠穆沁旗-辽宁东沟地学断面位于中国东北地区,全长960 km.从东至西横穿中朝地台的辽东台隆、下辽河断陷、燕山台褶带、内蒙地轴和内蒙古-大兴安岭褶皱系的西拉木伦河加里东褶皱带、贺根山华力西褶皱带和东乌珠穆沁旗加里东褶皱带等构造单元.在断面东南部还穿过海城地震区. 沿断面进行了综合地球物理深部探测、地质调查及综合研究,揭示了该断面地壳与上地幔结构明显地具有纵向分层、横向分区的特点.反映了中朝地台与内蒙古-大兴安岭褶皱系不同的地质构造演化历史、板缘和板内构造及其动力学特征.本文还阐述了海城强震区、朝阳-义县及西拉木伦河地震较活跃地区特殊的深部构造环境.

GEOSCIENCE TRANSECT FROM DONG UJIMQINQI, NEI MONGOL, TO DONGGOU, LIAONING, CHINA

The geoscience transect is located in Northeast China. It extends from Englehobol （45°28'N, 115°39'E） on the China-Mongolia boundary in the west to Dagushan Town （39°53'N, 123°38'E） on the shore of Huanghai sea in the east for 960km in total length in northwest trend, passing from east to west through two first-order geote-ctonic units, the Sino-Korean platform and Nei Mongol-Dahinggan Ling fold system. Moreower, the transect also cuts across the Haicheng M = 7.3 earthquake area and hence is a representative geoscience transect in Northeast China.The deep synthetic geophysical exploration, geological survey and comprehensive research which have been carried out along the geoscience transect reveal that the structure of the crust and upper mantle of the transect possesses obviously the characteristics of longitudinal stratification and transverse zoning which reJlect a different evlution periods of geological tectonics of Sino-Korean platform and Nei Mongol-Da Hinggan Ling fold system, the plate boundary and intraplate tectonics and their features.This paper elaborates a special deep tectonic environment of such areas as Haicheng seismic region and Chaoyang-Yixian County as well as Xer Moron He in which the earthquakes are more active.