甘肃阳山金矿带安坝矿段深部电性特征及控矿断裂系统的识别

Deep electrical characteristics and identification of ore controlling faults system of Anba ore section in the Yangshan gold-ore belt of Gansu province

阳山金矿带位于甘肃省文县境内,是目前我国已发现的较大规模独立金矿,自1997年被武警黄金第十二支队发现至今,其金资源量已超过380 t(1 t=1000 kg).为了查明阳山金矿带深部地质结构,确定找矿方向,我们利用GDP32Ⅱ型电磁法仪在矿区内开展了CSAMT法深部地球物理测量工作,通过与已知钻孔剖面的对比研究,基本查明了安坝矿段深部地质结构电性分布特征以及汤卜沟—观音坝—月亮坝分支断裂分布和产状,为矿区控矿因素、成矿规律的总结乃至矿体的圈连提供了依据.此外,研究证实了该方法在本矿区反演矿带深部构造特征从而间接指导找矿方面的有效性,确定了物探电法找矿标志,为下一步深部勘查奠定了基础.

The Yangshan gold belt which is located in Wen county of Gansu Province,is currently the large scale independent gold mine in China. The No. 12 gold geological party of CAPF had found it in 1997,so far,the amount of gold resources have been more than380 t. In order to find out the deep geological structure of Yangshan gold belt,and determine the ore prospecting direction,we had used the GDP32Ⅱ electromagnetic instrument in the mining area to carry out CSAMT measurement. By comparing with the known borehole profiles,we had determined electrical distribution characteristics of deep geological structures in Anba ore section and distribution and occurrence of Tangbugou-Guanyinba-Yueliangba branch fault. The research findings provide a basis to the study of ore controlling factors, metallogenic regularity and occurrence of orebody. In addition,The research had confirmed that the method is effective in retrieving the deep structural characteristics of ore belt and indirectly guiding for ore prospecting in the mining area,and the prospecting marks of geophysical method had been determined. It had established the foundation for the deep exploration of the next step.