微磁测量在坦桑尼亚构造蚀变岩型金矿床上的应用研究

doi:10.6038/pg20170522

摘要/Abstract

摘要：

构造蚀变岩型金矿床是坦桑尼亚绿岩带重要的金矿床类型.金矿脉和它所赋存的构造蚀变带与周围背景岩石磁性差异较小，高精度磁测难以反映出构造蚀变带和金矿脉引起的微弱磁场特征，为了获取构造蚀变带和金矿脉引起的精细磁场结构，在选择的单元测区（主要矿脉分布区）内进行了高密度、高精度、高分辨微磁测量（20 m×5 m）精细研究；微磁异常清晰地反映了构造蚀变带和金矿脉群引起的磁场特征，为钻探工程布置提供了充分的依据，起到了良好的找矿效果.研究认为寻找构造蚀变岩型金矿的微磁测量流程为：（1）开展1：1万地面高精度磁力扫面测量，大致圈定找矿靶区和选择单元测区；（2）单元测区内进行微磁测量，获取精细地磁场结构；（3）微磁异常上布置微磁剖面测量（点距2 m），定位构造蚀变带和金矿脉.微磁测量对坦桑尼亚其他绿岩带以及我国（乃至世界）绿岩带地区寻找构造蚀变岩型金矿也具有良好的示范和指导意义.

Abstract:

The tectonic altered rock type gold deposit is an important gold type in Tanzania greenstone belt.Gold vein and its occurrence of tectonic altered rock band and the surrounding background magnetic difference is small,high precision magnetic survey is difficult to reflect the tectonic altered zone and gold vein caused by weak magnetic field characteristics, in order to get the fine structure of magnetic field caused by structure alteration zone and gold vein, using a high density, high precision, high resolution micromagnetic survey (10 m×2 m) in the choice of unit survey area (main mining veins area).Micromagnetic anomaly clearly reflect features of the magnetic field caused by tectonic altered zone and gold vein group, layout provides the full basis for drilling project, has played a good prospecting effect. Research suggests, micromagnetic survey looking for tectonic altered rock type gold deposit, its exploration combination process is:(1)Using the ground high-precision magnetic survey(1:10000), roughly outline prospecting target area and select unit test area.(2) Using the micromagneticsurvey in unit test area to obtain fine magnetic field structure. (3)Put micromagnetic anomaly profile survey(distance of 2 m), positioning tectonic altered zone and gold vein.The micromagnetic survey also has a good demonstration and guidance for other greenstone belt in Tanzania and in China's(even world) greenstone belt to looking forthe tectonic altered rock typegold deposits.

中图分类号:

P631

李水平, 彭俊, 荆鹏, 张爱玲, 邵江波, 赵华奇. 2017. 微磁测量在坦桑尼亚构造蚀变岩型金矿床上的应用研究. 地球物理学进展, 32(5): 2021-2028. doi: 10.6038/pg20170522.

LI Shui-ping, PENG Jun, JING Peng, ZHANG Ai-ling, SHAO Jiang-bo, ZHAO Hua-qi. 2017. Micromagnetic survey application research on a tectonic altered rock type gold deposit in Tanzania. Progress in Geophysics. 32(5): 2021-2028. doi: 10.6038/pg20170522.

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