An integrated ore prospecting model for the Nyasirori gold deposit in Tanzania  

作　　者：Yang-sen Yuan Shui-ping Li Jun Peng Jian-tao Si Hua Cheng Jin Sun Jian-zheng Wei Jiang-bo Shao 

机构地区：[1]No.2 Institute of Geological and Mineral Resources Survey of Henan,Zhengzhou 450001,China

出　　处：《China Geology》2019年第4期407-421,共15页中国地质（英文）

基　　金：This work is financially supported by the Special Fund for Foreign Mineral Resources Risk Exploration(201210B01600234).

摘　　要：The Nyasirori gold deposit,located in the middle-western end of the Musoma-Mara Archean greenstone belt in Tanzania,is a tectonic altered rock type gold deposit controlled by shear tectonic zone.This work conducted high-precision ground magnetic measurements to delineate fault structures and favorable prospecting targets,utilized induced polarization(IP)intermediate gradient to roughly determine the distribution and extension of the tectonic altered zone and gold ore(mineralized)bodies,and further carried out IP sounding and magnetotelluric sounding to locate the tectonic altered zone and gold ore(mineralized)bodies.The anomalous gradient belt of the combination of positive and negative micromagnetic measurements reflects the detail of shallow surface tectonic alteration zone and gold mineralization body.Micromagnetic profile anomalies indicate the spatial location and occurrence of concealed tectonic alteration zone and gold(mineralized)ore bodies.Soil geochemical measurements indicate that the ore-forming element Au correlates well with As and Sb,and As and Sb anomalies have a good indication to gold orebodies.Based on the multi-source geological-geophysical-geochemical information of the Nyasirori gold deposit,this work established an integrated prospecting model and proposed a set of geophysical and geochemical methods for optimizing prospecting targets.

关 键 词：GEOPHYSICS Geochemistry PROSPECTING model Gold deposit ARCHEAN GREENSTONE belt Tectonic ALTERED rock type Mineral exploration engineering Nyasirori Tanzania 

分 类 号：P618.51[天文地球—矿床学]