铅同位素在甘肃格尔珂金矿深部找矿中的应用与实践

摘要

铅同位素系统剖面化探方法及定量预测模型已经在铀矿床、铜矿床、金矿床和铅锌矿床(深部)找矿中得到了良好的应用和推广.将该方法和预测模型引入到大水金矿田格尔珂金矿(原称大水金矿)深部找矿研究中,并以其对格尔珂金矿12条勘探线的矿体进行了隐伏深度下限HL、隐伏系数R、隐伏资源量QB和富集系数K等模型参数的研究和预测,指示出研究区最佳深部找矿潜力区位于研究区西部,东部的深部找矿潜力最小,中部介于二者之间.最后,结合预测后近8年的实际生产数据和资料,将预测结果与生产实践做对比后表明:研究区的铅同位素定量预测模型构建正确,达到了预测效果,正确指导了研究区的深部找矿工作;在预测潜力最佳的研究区西部实现了深部找矿的重大突破,发现单是一个(Au2)矿体的隐伏资源量就能达到预测模型中全区的隐伏资源量,在研究区中部(Au111矿体)和西部(Au37矿体)也有比预测更大的潜力;用实际的生产实践数据和资料进一步提高了研究区的深部找矿潜力.该文为铅同位素方法在深部找矿中的应用提供了新的成功实例,并以实践资料补充、完善了铅同位素定量预测模型.%The geochemical prospecting method and quantitative forecasting model of lead isotopes have been applied and popularized in exploring U,Cu,Au and Pb-Zn deposits.In this paper,the method and model were introduced into the Ge'erke gold deposit in the Dashui ore field for buried ore-bodies prospecting.This paper focuses on twelve exploration lines of Ge'erke gold deposit,while calculates and forecasts a series of important parameters including ore buried depth limit (HL),ore buried parameter (R),buried resource reserves (QB) and concentration coefficient (K).The forecasting results indicate that the best potential area of buried ore-bodies prospecting is likely located in the west of study area,and the potential decreases from west to east.Finally,the forecasting results are compared with the actual production data and information of the nearly eight years after forecasting.The comparison results show that the forecasting model and result are right,and successfully guiding buried ore-bodies prospecting;a significant breakthrough of buried ore-bodies prospecting are made in the west of study area,while the buried resource reserve of Au2 gold orebody can achieve the forecasting resource reserves of the whole study area;the buried resource reserves (of Au111 and Au37 gold orebodies) of the middle and east areas are also greater than previously thought;the actual production practices further improve the potential of buried ore-bodies.This paper not only provides a new successful instance of lead isotopes exploration to buried ore-bodies prospecting,but also supplements and improves the quantitative forecasting model of lead isotopes.