甘肃夏河-合作金富集区资源潜力分析——以金、银、锑地球化学块体为例  

Analysis on Resource Potential of Xiahe-Hezuo Au Enrichment Area,Gansu:Taking Geochemical Blocks f Au,Ag and Sb as an Example

作　　者：李卫红[1] 刘建宏 李通国[3] 贾志磊 姚珊 

机构地区：[1]甘肃地矿科技信息中心,甘肃兰州730000 [2]甘肃省地质矿产勘查开发局,甘肃兰州730000 [3]甘肃省地质调查院,甘肃兰州730000 [4]陕西省地质调查中心,陕西西安710068

出　　处：《西北地质》2015年第2期121-127,共7页Northwestern Geology

基　　金：甘肃省2013年度省级矿产资源补偿费地质勘查项目"西秦岭金矿的成矿及找矿研究"

摘　　要：甘肃夏河-合作金富集区属秦岭造山带西段,地质构造复杂,出露地层主要有石炭系、二叠系、三叠系和古近系。燕山期、印支期中酸性岩浆侵入活动强烈,断裂构造以走向逆断层为主,次级断裂和层间破碎带发育。区内查明矿床点47处,其中大型及以上规模金矿床3处,中型3处,小型41处,显示了巨大的找金潜力。笔者应用"地球化学块体"理论和方法,对金、银、锑地球化学块体进行圈定与内部结构剖分,研究区域异常转变为局部异常、构建元素地球化学谱系树,追索各子块体浓集成矿的轨迹。通过分析,认为该区Au高值区面积大,各层次块体浓集趋势明显,形成Au地球化学省,与Ag、Sb块体空间叠加组合,计算出该块体500m以浅金资源总量1 000t,具备寻找大型-超大型金矿床的地球化学块体特征。区内成矿地质条件优越,通过开展金资源潜力评价,对本区的矿产资源评价、勘查工作部署具有重要指导意义。Au enrichment zone in Xiahe-Hezuo of Gansu Province is located in the west section of Qinling orogenic belt,where the geological condition is complicated,with major outcropped stra-ta including Carboniferous,Permian,Triassic and Paleogene.In Yanshanian and Indosinian,the intermediate-acid magma intrusive activity is intensive.The faults are mainly overthrust strike-slip faults,with occurrences of secondary fractures and interlayer fracture zones.47 mineral spots were identified,among which there are 3 large-scale occurrences,3 middle-scale and 41small-scaledeposits,indicating great potential for prospecting.Based on the theories and method of geochemical blocks,the authors confirmed geochemical blocks of Au,Ag,Sb and anatomized its structure with GeoMDIS and geochemical data handling.Abnormity conversion from regional to local was studied,family tree of elements geochemistry was established,and the mineralization track of each sub-block was recovered.Results show that the high Au value area is large;blocks of each level concentrate significantly to form Au geochemical province,which is spatial overlaid and combined with Ag and Sb blocks.It is calculated that the total of light gold within 500 m is 1000 t,with the geochemical block characteristics of large and ultra-large gold deposit.The ore-forming geological conditions in the study area is favorable;evaluation on Au resources potential has important significance for mineral resources evaluation and exploration.

关 键 词：甘肃夏河-合作 金银锑地球化学块体 资源潜力分析 

分 类 号：P618[天文地球—矿床学]