摘要
利用重、磁、电资料对天津市地球物理场和基底构造特征进行了综合分析和研究。研究认为:重、磁、电综合地球物理场可以较好的复原研究区当今构造格架,区域性的地球物理场总体是太古宇结晶基底的反应,局部异常场的变化与中生代以前形成的褶皱基底的起伏关系密切,表现出被断裂分割的断块组合的特点,沿深大断裂多有磁性火山岩分布。在圈定主控断裂体系的基础上,划分了马兰峪复式背斜、冀中坳陷、沧县隆起、黄骅坳陷4大构造单元,并依据重磁异常对区内局部构造和磁性体的分布进行了圈定,这些成果为区域地壳稳定性和矿产资源评价提供了基础地球物理资料依据。
In this paper, the authors systematically analyzed and studied the geophysical field and characteristics of the basement structure of Tianjin by using gravitational,magnetic and electric data.Some conclusions have been reached：the analysis of the gravitational,magnetic and electric field could satisfactorily recover the tectonic framework of the study area,the regional geophysical field is the reflection of the Archean crystalline basement, the change of the local field has close relationship with the preMesozoic folded basement,the preMesozoic basement shows a characteristic of fault block combination cut by the fault,and there are magnetic volcanic rocks distributed along the huge fault.On the basis of the delineation of the master fault system,the authors divided the study area into four tectonic units：Malanyu anticline, Jizhong depression, Changxian rise and Huanghua depression;using the gravity and magnetic anomaly,the authors delineated the distribution of local structures and magnetic geological bodies.The results obtained by the authors provide basic geophysical data for the study of the regional crustal stability and the evaluation of mineral resources.
出处
《物探与化探》
CAS
CSCD
2015年第5期937-943,共7页
Geophysical and Geochemical Exploration
基金
中国地质调查局
天津市国土资源局部市合作项目(基[2012]01-001-009)
关键词
重、磁、电
参数模型
地球物理场
基底构造
gravitational,magnetic and electric properties
parameter model
geophysical field
basement
