青海祁漫塔格地区有效找矿方法总结

文章对祁漫塔格地区近年取得找矿突破的有效方法进行了归纳总结.在青海祁漫塔格地区的有效找矿方法主要有:①地球化学找矿方法,1∶20万化探扫面工作圈定的水系沉积物测量综合异常锁定了该区60％以上的已发现大中型矿床,地电化学技术方法能准确定位分布在覆盖区和半覆盖区的多金属矿矿(化)体,提高了找矿命中率;②高精度磁法在找矿中发挥了举足轻重的作用,1∶1万高精度磁法测量工作圈定了一系列具一定规模(长大于200m)呈线型或面型正磁异常,基本覆盖所有铁多金属矿区;③剖面测量综合分析找矿方法,通过1∶1万地质测量、剖面测量工作为准确预测找矿有利部位和可视化信息提供可靠依据;④成矿“缺位”预测的应用,暗示祁漫塔格成矿带除矽卡岩型矿床以外,其他类型找矿有望取得新突破.总之,目前在祁漫塔格地区主要依靠地面高精度磁法、水系沉积物测量法、地电化学法、地质剖面法及遥感方法等综合方法的综合利用,并与矿床成矿规律研究密切相结合,有望实现找矿突破.

Summary of effective prospecting methods in Qimantag area, Qinghai Province

This paper has summarized the effective methods which resulted in prospecting breakthrough in Qimantag in recent years. There are four effective prospecting methods in Qimantag area. The first is the geochemical prospecting method: the stream sediment comprehensive anomalies delineated by 1:200 000 geochemical prospecting surface work have locked more than 60% of the large and medium-sized known deposits in the area, and the electrochemical method can accurately locate polymetallic ore bodies in the coverage and half-covered areas, increasing the prospecting hit rate. The second is the precision magnetic method, which has played a pivotal role in prospecting, the 1:10 000 high-precision magnetic survey delineated a series of linear or planar positive magnetic anomalies with certain sizes (more than 200 m in length), covering almost all of the iron polymetallic ore deposits The third is the comprehensive analysis of prospecting methods by the cross-section measurement, which provides a reliable basis for accurate prediction of the favorable prospecting locations and visualized information through 1:10 000 geological survey and cross-section survey. The fourth is the application of mineralization "absence", implying new prospecting breakthroughs for other types of deposits besides skarn-type in the Qimantag metallogenic belt. In a word, the prospecting mainly relies on the comprehensive utilization of ground precision magnetic method, stream sediment survey, geo-electrochemical method, geological section and remote sensing, in close association with metallogenic regularity, to achieve breakthrough in Qimantag region.