西秦岭寨上金矿原生晕地球化学特征及成矿预测

从单孔岩芯岩石原生晕异常、矿脉中元素横向变化、元素垂向变化、不同标高地球化学参数变化和矿脉中元素走向变化等方面对寨上矿区的原生晕异常进行评价，并对76线剖面和9-1号矿体深部及外围进行成矿预测。单孔岩石原生晕分析认为，当Au的原生晕值＞100×10-9时，对应的样品Au品位＞0.5×10-6。对76线剖面岩石地球化学进行分析，大致分出3组异常组合，每组异常组合由不完整的前缘晕、近矿晕和尾晕组成，据此进行深部成矿预测。对76线不同标高岩石原生晕进行分析，得出2 520、2 440 m标高Au元素平均值最高，矿化最强。对9-1号矿脉原生晕异常进行分析，近矿元素在2 430~2 700 m标高之间形成富集区。按照元素分布规律，预测9-1号矿体深部仍有5个预测靶区。在垂向上，寨上金矿显示了成矿的多阶段性以及分段富集规律，预示着深部找矿潜力巨大。

Primary Geochemistry Characteristics and Metallogenic Prediction of Zhaishang Gold Deposit, West Qinling

Primary halo on the mining area in the Zhaishang gold deposit were evaluated from the following aspects :single-hole core rock primary halo abnormal elements in the lateral variation in the veins,the veins element vertical variation of the different elevation of geochemical parameters change,the elements of the veins towardchanges,etc.We also conduct mineralization forecast in 76 line profile,deep and peripheral of 9-1 orebody.Analysis of single-hole ore primary halo shows that when the primary halo value is greater than 100×10-9,the gold grade of accordingly sample is basically greater than 0.5×1 0-6.Roughly three groups abnormality of association may be distinguished through the analysis of the 76 line profiles ore geochemistry,each group is composed of incomplete front halo,ore-body halo and rear halo abnormality,whereby the ore-prediction in deep.Analysis study of the primary halo in different elevation ore in 76 lines shows that there was the highest average Au element elevation and strongest mineralization in 2520 m and 2440 m elevation.For No.9-1 oreveins,element scloseto the ore form a enrichment region between 2430 m and 2700 m elevation.There are still 5 forecast targets in ore the body deep No.9-1,in accordance with the laws of element distribution.Zhaishang gold deposit having multi-stage mineralization and segmentatio nenrichment patterns in the vertical direction,indicates great prospecting potential in deep.