利用矿床原生晕进行深部隐伏矿体预测——以山东埠上金矿为例  

THE APPLICATION OF PRIMARY HALOES OF THE ORE DEPOSIT TO THE PROGNOSIS OF DEEP CONCEALED OREBODIES——EXEMPLIFIED BY THE BUSHANG GOLD DEPOSIT IN SHANDONG PROVINCE

作　　者：代西武[1] 杨建民[2] 张成玉 于跃军 徐珏[2] 王风海 丘志刚 

机构地区：[1]北京建筑工程学院,北京100044 [2]中国地质科学院矿产资源研究所,北京100037 [3]齐齐哈尔地质总公司,齐齐哈尔161000 [4]山东金岭金矿,山东招远265404

出　　处：《矿床地质》2000年第3期245-256,共12页Mineral Deposits

基　　金：国家黄金局找矿项目!"山东埠上金矿体分布规律及深部预测"的部分成果 (编号 :0 92 0 8)

摘　　要：科学的成矿预测实质上是在正确的成矿分析基础上的合理推断。埠上金矿是胶东招掖金矿带中部的一个中型金矿 ,经过多年开采之后 ,后备储量严重不足 ,急待扩大远景储量。由于有 50～ - 2 0 0 m标高的采矿坑道及几个钻孔资料 ,使得采集不同垂深之样品成为易事 ,为矿床原生晕方法提供了基础和前提。研究后认为 ,埠上金矿原生晕为正向分带序列 ,在 - 30 0 m标高之下有盲矿体存在 ,矿体向下仍有很大延伸 ,深部矿体向 SW方向侧伏。到 1999年底 ,埠上金矿床开采深度已达 - 32 0 m中段 ,揭露到了被预测的矿化富集带的上部 ,深部矿体沿 SW方向向下延伸。我们认为 - 4 0 0～ - 50 0 m标高之间可能为该矿体的 Au富集部位。Scientific metallogenic prognosis means reasonable inference based on correct analysis of metallogenesis.The Bushang gold deposit is a medium\|size gold deposit in the central part of the Zhaoyuan gold ore belt in east Shandong.Having been exploited for many years,the mine is severely deficient in reserves and is hence badly in need of expanding prospective reserves.The existence of data from mining galleries at the elevation of 50～200 m and several drill holes make it easy to collect samples at different vertical depths and provides grounds and prerequisite for the application of the primary halo technique.In the Bushang gold deposit,the study of the structural characteristics of geochemical anomalies in various sections and the key prognostic criteria constitutes the crux of evaluating ore\|hunting prospects and looking for concealed orebodies.The element association of primary anomalies in the Bushang gold deposit consists of Au,Ag,Cu,Mo,Bi,Pb,W,Mn and As,and the vertical zoning of primary haloes is Sb\|As\|Ba\|Cu\|Pb\|Zn\|Ag\|Au\|W\|Mn\|Co\|Ni in downward succession,belonging to normal zonal sequence.The indicator elements in the front halo of the orebody are Sb,As and Ba;the near\|ore indicator elements include Cu,Pb,Zn Ag and Au;the indicator elements in the rear halo are W,Mn,Co and Ni.Relative to primary haloes of gold deposits in the northwestern part of east Shandong,the primary haloes in the Bushang gold deposit are characterized by quite high Au,Ag,Cu,Mo,W,Co and Ni.Based on the study of primary haloes of the ore deposit,it is predicted that the part between -200 m and -300 m is the weak zone of the orebody,and that there might exist a blind orebody below -300 m,which extends considerably downward,gets enriched between -400 m and - 500 m,and pitches southwestward with increasingly steeper angles.By the end of 1999,the mining work in the Bushang gold deposit had reached -320 m and the upper part of the predicted enriched zone had been exposed.It is shown that the orebody extends downward in southwest

关 键 词：隐伏矿体预测 矿床原生晕 正向分带 金矿 

分 类 号：P618.510.8[天文地球—矿床学]