摘要
澳大利亚阿德拉山金矿地处早古生代拉克兰造山带,主矿体赋存于志留纪花岗闪长岩岩株中,围岩为奥陶纪片岩,其中发育少量含金石英脉。通过矿体三维模型,采用距离幂次反比法,对三维空间中的Au、Ag、As、Bi、Cd、Co、Cu、Mo、Ni、Pb、Sb、Se、Sn、Te、W、Zn共16种元素品位进行赋值,建立了原生晕三维模型和前尾晕元素乘积比值参数三维模型。原生晕模型显示,矿体中Au具多个浓集中心,预示多期次热液成矿作用;主矿体中前缘晕元素为As、Ba,近矿晕元素为Au、Ag,尾晕元素为Bi、Mo、Sn、W。前尾晕元素乘积比值参数(As×Ba)/(Bi×Mo)、(As×Ba)/(Sn×W)、(As×Ba)/(Bi×Mo×Sn×W)的三维模型显示,Ⅰ号侵入岩体在标高-580 m以深比值参数发生由降到升的转折,提示深部可能发育新的金盲矿体。
Mount Adera Au deposit is located in Early Palaeozoic Lachlan orogenic belt.The main ore body occurs in Silurian granitic dioxide stock intruded in Ordovician schist.A few Au-bearing quartz veins are developed in the schist.The Inverse distance power is used to assign content of 16 elements(Au,Ag,As,Bi,Cd,Co,Cu,Mo,Ni,Pb,Se,Sn,Te,W and Zn)in 3D space so as to build 3D model of the primary halo and 3D model of product ratio parameter of element of the front halo and rare halo.The primary model shows multi-concentration centers of Au in the ore body indicating multi-stage hydrothermal mineralization.For the main ore body As and Ba are the front halo elements,Au and Ag the proximal halo elements,Bi,Mo,Sn and W the rear halo elements.3D model of element product ratio parameter(As×Ba)/(Bi×Mo),(As×Ba)/(Sn×W),(As×Ba)/(Bi×Mo×Sn×W)of front and rear halo shows that below elevation-580 m the parameter rises instead of trop.This is an indication of blind Au ore bodies occurring to depth of Mount Adera Au deposit.
作者
杜菊民
景永波
陈诚
陈峰
蔡卫东
连晨光
DU Jumin;JING Yongbo;CHEN Cheng;CHEN Feng;CAI Weidong;Lian Chenguang(Jiangsu Geology and Engineering Co.,Ltd.,Nanjing 210018,China;Geological Exploration Technology Institute of Jiangsu Province,Nanjing210049,China;The 1st Geological Brigade of Jiangsu Geology and Mining Exploration Bureau,Nanjing 210041,China)
出处
《地质找矿论丛》
CAS
2023年第3期397-406,共10页
Contributions to Geology and Mineral Resources Research
基金
“江苏省自然资源发展专项”项目(编号:苏财资环[2021]46号)
“江苏省省外、国外矿产资源风险勘查专项”项目(编号:苏地矿发[2019]139号)联合资助
