大伙房水库断裂构造特征的航磁解释

Aeromagnetic explanation of Dahuofang Reservoir's fault structure

为查明大伙房水库库区的断裂构造特征及分布,保证工程的正确选址,使工程建设与其他地质环境相协调提供基础资料,利用航磁手段,编制了航磁△T磁场等值线图,将该区断裂构造分为四组,对其分布特征进行解释。不同性质磁场区之间,分界线两侧区域地质发展及演化存在明显差异,其断裂规模大、切割深;线性正或负磁异常带,反映出断裂控制与周边地区的岩性变化;串珠状线性异常带中的单个异常多呈等轴状或似二度异常,沿断裂存在着岩浆活动,断裂切割的深度较深。

This paper draws the isoline figure of aeromagnetic AT magnetic field distribution, using aeromagnetic method and data, to find out the distribution and characteristics of Dahuofang Reservoir＇ s fault structure which are the basic data of project location and coordination of project construction and geological environment. This paper divides this area fault structure into four groups and interprets fault structure and distribution characteristics of this area. Then this paper summarizes the obvious differences of geological development and evolution of both sides of the demarcation line between different magnetic fields and finds that this kind of fault structure is big and deep through studying the relationship of magnetic field characteristics and fault structure. The linear positive or negative magnetic anomaly zone reflects the lithology changes of fault and surrounding areas. The single abnormality in the beaded-linear anomaly zone is always equiaxed and approximately two-dimensional anomaly, shows there is magmatism along the fault structure, and reveals the fault is very deep.