磁法在覆盖区找金矿一例

A CASE STUDY OF MAGNETIC METHOD APPLIED TO THE GOLD PROSPECTING IN THE COVERED AREA

摘要:

山东招莱地区是一个重要的金矿成矿区。本文介绍的是以地面磁法测量为主,于1979年在仓上覆盖区,以追索三山岛金矿构造为目的地质填图工作。本区内的金矿断裂构造即花岗岩与太古代胶东群变质岩呈构造接触带。此二种岩性表现了不同的磁性特征,具备了磁法工作的地球物理前提,可以划分不同岩性及其接触界线、确定构造展布位置。另外通过对变质岩中条带状磁异常—磁性标志层的分析,还能确定构造性质。根据地质成矿规律和本区金矿控矿的三个地质条件,在确定含矿构造的基础上,于断裂的拐弯部位,圈出成矿预测区。预测的成功,说明应用磁法可以达到间接寻找金矿的目的。如果综合地利用物化探资料,地质效果会更加突出。

Abstract:

Zhaoyuan-Laizhou Area in Shandong is an important metallogenetic province for gold. The geological mapping aimed at tracing the structures of the Sanshandao gold deposit was carried out in the Cangshang Covered Area in 1979, with the ground magnetic survey being the essential work. The faults related to the gold deposits in the area often follow the contact between granites and metamorphic rocks of the Achaean Jiaodong Group. These two types of rock exhibit different magnetic properties which provide the pr...