综合物探方法在安徽明光市西张郢地区金矿找矿中的应用

张八岭一带西张郢地区地质情况复杂,为查明地层展布和构造情况,以区域重磁资料为基础,对区域性断裂构造展布进行推断,研究区内岩体的分布范围和形态特征。为调查西张郢地区张八岭群西冷组构造带中的含金银石英角斑岩脉,通过对地面实测的磁异常数据进行处理,并进行激电中梯、重磁剖面及大功率激电测深测量,提取有利于找矿靶区选择的综合物探异常。结合地质资料解译综合物探异常特征,结果表明: 区内综合物探异常由张八岭群西冷组老三界—管店NW向向斜构造侵入脉岩引起,区内岩性主要为张八岭群西冷组石英角斑岩,是张八岭地层寻找含金银石英脉的主要依据。研究成果为西张郢地区深部找矿工作、外围找矿工作及找矿靶区的初选提供了参考和依据。

Application of comprehensive geophysical methods in gold deposits prospecting in Xizhangying area of Mingguang City in Anhui Province

The geological conditions in Xizhangyong area of Zhangbaling zone are complex. In order to find out the stratum distributions and structure conditions, based on the regional gravity and magnetic data, the author inferred the regional fault structure distribution, and studied the distribution range and morphological characteristics of rock mass in the area. In order to investigate the Au-Ag-bearing quartz keratophyre veins in the structural belt of Xileng Formation of Zhangbaling Group in this area, the author processed the magnetic anomaly data measured on the ground to extract comprehensive geophysical anomalies favorable for prospecting target areas, using the IP mid-elevator, gravity-magnetic profile and high-power IP sounding surveys. Combined with the interpreted characteristics of comprehensive geophysical anomalies, the results showed that synthetical geophysical anomalies in the area were caused by the veins intruding into Laosanjie-Guandian NW syncline structure in Xileng Formation of Zhangbaling Group. The lithology in the area was mainly quartz keratophyre in Xileng Formation of Zhangbaling Group, which was the main basis for searching for gold-silver-bearing quartz veins in Zhangbaling Group. This study provides a reference for deep prospecting, peripheral prospecting and primary selection of prospecting targets in Xizhangying area.