摘要
为了深入研究东北地区断裂分布及构造分区,利用全国1∶2 500 000布格重力异常图,分析了泛东北地区(包括东北3省及内蒙古自治区的东北部分地区)的区域重力场特征。利用布格异常变化形态,并参考地质资料,在研究区内划分出岩石圈断裂14条,壳内断裂11条。根据大兴安岭和依兰—伊通两条明显的重力异常梯级带把研究区划分出兴安、松嫩以及张广才岭等三大重力异常区,在划分断裂和分析重力场特征的基础上进行了构造分区。其研究成果为认识和研究泛东北地区油气与矿产分布提供了重力场方面的依据。
In order to further study the fault distribution and the tectonic division in northeast China, the features of the regional gravity field is analyzed in terms of the 1 ： 2 500 000 contour map of Bouguer gravity anomalies. The studied region includes Liaoning, Jilin and Heilongjiang provinces and northeastern part of Inner Mongolia autonomous region. Based on the variation of the Bouguer anomaly and the corresponding geological data, 14 lithospheric faults and 11 crustal faults are recognized in the region. Three gravity anomaly regions, which are Xing＇an, Songnen and Zhangguangcai Mountain, are divided according to apparent Daxing＇anling and Yilan-Yitong gravity anomaly belts. The results can provide gravitational reference for understanding and research of the petrologic and mineral exploration of the studied region.
出处
《地球科学与环境学报》
CAS
2009年第2期200-206,共7页
Journal of Earth Sciences and Environment
基金
国家发展和改革委员会项目(XQ-2004-07)
关键词
重力场
东北地区
断裂分布
构造分区
gravity field
northeast China
fault distribution
tectonic division
