玛曲大水金矿原生晕地球化学特征及深部找矿预测  

GEOCHEMICAL CHARACTERISTICS OF PRIMARY HALOS AND DEEP PROSPECTING PREDICTION OF DASHUI GOLD MINE,MAQU,CHINA

作　　者：王滔 毛艳丽 黄从俊 孟广安 WANG Tao;MAO Yan-li;HUANG Cong-jun;MENG Guang-an(The Third Institute of Geology and Minerals Exploration,Gansu Provincial Bureau of Geology and Minerals Exploration and Development,Lanzhou 730050,China;Engineering Technology Research Center for Exploration and Comprehensive Utilization of Metal and Precious Metal Mineral Resources of Gansu Province,Lanzhou 730050,China;Chengdu Center of China Geological Survey,China Geological Survey,Chengdu 610081,China;Geological and Mineral Research Center of Hebei Province,Shijiazhuang 050051,China)

机构地区：[1]甘肃省地矿局第三地勘院,甘肃兰州730050 [2]甘肃省金属贵金属矿产资源勘查与综合利用工程技术研究中心,甘肃兰州730050 [3]中国地质调查局成都地质调查中心,四川成都610081 [4]河北省地质矿产研究中心,河北石家庄050051

出　　处：《甘肃地质》2023年第3期27-35,共9页Gansu Geology

基　　金：中国地质调查局发展研究中心老矿山深部和外围找矿项目“甘肃省玛曲县大水金矿接替资源勘查”(1212011220727)。

摘　　要：为延长大水金矿的服务年限,解决资源危机,通过对矿区构造叠加晕研究,对其深部找矿潜力和找矿方向进行预测和评价。系统采集矿区69个中段、120个钻孔的岩石、矿石样品进行测试分析,利用多元统计方法,对矿区成矿成晕元素的组合特征和空间分布特征进行分析,并以找矿前景较好的87(B)勘查线为主要研究对象。研究表明:(1)大水金矿主成矿元素Au与伴生元素As、Sb、Hg表现出较好的正相关关系,可作为后期找矿勘查的重要指数元素;(2)原生晕元素具有“前、尾晕共存”和“反分带”现象,且地球化学参数在轴向上呈波动变化的特点,表明大水金矿成矿过程具有多期多阶段叠加的特征,预示深部有盲矿体存在;(3)通过预测,在87(B)勘探线深部得到验证,发现了新的矿体。结果证明原生晕对预测深部隐伏矿体具有重要指导意义。In order to prolong production period and solve resource crisis in Dashui gold mine,deep prospecting potential and goals have been predicted and evaluated by studying the structural superimposed halos in the mining area.The rock and ore samples from 69 middle sections and 120 boreholes in the mine have been collected and analyzed systematically.The assemblage and spatial distribution characteristics of ore-forming halo elements in this area have been analyzed by means of multivariate statistical method.Consequently,the 87th(B)exploration line with a good prospecting potential can be accepted as the major research object.The results show that:Au,the crucial ore-forming element in Dashui gold mine has a great positive correlation with accompanying elements As,Sb and Hg,which can be taken as important index indicators for subsequent prospecting;The elements of primary halos are characterized by the coexistence of the front and rear halos and the reverse zonation,and fluctuations of geochemical parameters in the axial direction,indicating that the ore-forming process of Dashui gold mine features multi-stage and multi-stage superimpositions,and foretelling the existence of blind orebodies at depth.With these efforts,we can confirm that the primary halos in the mine are of guiding significance for predicting deep buried gold ore bodies.

关 键 词：地球化学特征 原生晕 深部找矿预测 大水金矿 玛曲县 

分 类 号：P618.51[天文地球—矿床学] P632[天文地球—地质学]