甘肃西秦岭地区重要金矿预测模型的建立及资源潜力预测

Building a Prediction Model for Resource Potential Forecast of Principal Gold Deposits in West Qinling Mountains of Gansu Province

为满足当前形势下甘肃西秦岭地区金矿勘查开发与战略部署的要求,在甘肃省金矿资源潜力动态评价成果的基础上,总结了甘肃西秦岭地区金矿资源特征、预测模型及资源潜力,初步提出西秦岭地区金矿勘查工作部署建议。西秦岭岩金矿产地有223处,燕山期为主要成矿期。分布于甘肃南部的陇南、天水、甘南地区,矿床类型以岩浆热液型、浅成中-低温热液型矿床为主,在此基础上,修正了李坝、大桥、阳山典型矿床预测模型,建立了早子沟、加甘滩、寨上、小东沟等4个典型矿床预测模型。采用矿床模型综合地质信息预测方法,应用MRAS软件,圈定预测区179处,运用体积法,估算金矿预测量3512.107 t。相较甘肃省矿产资源潜力评价成果(2013年),预测区增加了18处,预测量增加了461.03 t,新增主要分布于以地南、小东沟-天子坪一带等重点找矿地段,预测成果将为甘肃西秦岭地区金矿勘查工作部署提供科学依据。

In order to meet the requirements of exploration,development and strategic deployment of gold deposits in West Qinling Mountains of Gansu Province under the current situation,from a dynamic analysis of gold deposit potential in Gansu Province,a prediction model for resource potential forecast is introduced to meet the requirements of exploration,development and strategic deployment of gold deposits under the current trend.Characteristics,relevant suggestions on geological exploration and deployment of gold deposits are also preliminarily put forward.There are 223 rock gold deposits in West Qinling Mountains,and Yanshanian is the main oreforming period,mainly distributed in Longnan,Tianshui and Gannan areas in southern Gansu Province.The deposit types are mainly magmatic hydrothermal type and epithermal medium-low temperature hydrothermal type.Based on this,the prediction model of Liba,Daqiao and Yangshan typical deposits is modified.Four typical ore deposit prediction models have been established,including Zaozigou,Jiagantan,Zhaishang and Xiaodong.By using the comprehensive geological information prediction method of deposit model and MRAS software,179 prediction areas were delineated,and the predicted gold amount of 3512.107 tons was estimated by volume method.Compared with the evaluation result of mineral resource potential in Gansu Province(2013),the number of predicted mineral resources increased by 18,and the predicted amount increased by 461.03 tons.The newly added mineral resources were mainly distributed in the key prospecting areas such as Yidinan area and Xiaodong Guo-Tianziping area.The prediction results will provide a scientific basis for the gold exploration in West Qinling Mountains of Gansu Province.