Geochemical Quantitative Assessment Of Mineral Resource Potential In The Central And Southern Da Hinggan Mountains In Inner Mongolia

Typical deposit modeling used in resource prediction can avoid and reduce the risk of exploration and improve the exploration efficiency.It has gained much more attention of government departments and related scholars,which has important research and practical significance.The Greater Khingan Mountains metallogenic belt is one of the 19 important metallogenic zones in China.Some large-scale Ag-Pb-Zn polymetallic ores deposit were found in the middle-southern section of the Greater Khingan Mountains metallogenic belt,such as the Bairendaba Ag-Pb-Zn polymetallic ore deposit,the Baiyinnuoer Pb-Zn deposit and the Huaaobaote Pb-Zn-Ag polymetallic ore deposit.Due to new ore deposits were constantly found in recent years,the middle-southern section of the Greater Khingan Mountains metallogenic belt gained more and more attention by the relevant scholars and was delineated as a key prospecting area for Pb-Zn polymetallic ore deposit by China Geological Survey.It was beneficial to establish the prospecting models,in that the work degree ofgeology,geochemistry,geophysical work are high.However,the utilization of geochemical data is relatively low and need to be studied and utilized.Therefore,this paper studies geological-geochemical modeling and quantitative prediction for Pb-Zn polymetallic ore deposit,which was based on geology and geochemical information in the middle-southern Greater Khingan Mountains metallogenic belt.Based on the geological and geochemical theory of diagenesis,mineralization and halo,and in view of some of the main problems in geochemical methods for deposit modeling and resource prediction in the mineral resources exploration and the actual situation of the study area six aspects of research was carried out.The following results are Achieved :1.Geochemical modeling was established by the data from multiple scales and medium of geochemical suverys,which was improve the scientific nature of the geology-geochemistry Modeling.2.Based on the geological-geochemical model of the typical ore deposit,the geological-geochemical model of metallogenic sub-belt was established.3.A new software for geochemical medeling and resource prediction was developed.4.The Pb-Zn enrichment mechanism and mineralization of the southern section of the Greater Khingan Mountains metallogenic belt was summed up.Results of comprehensive research on the geologic and geochemical characteristics ofthe Pb-Zn polymetallic ore belt in the southern part of the Greater Khingan Mountains metallogenic belt shown that magmatic hydrothermal activity was considered as the dominant factors for the mineralization of Pb-Zn polymetallic deposits.The Permain stratum provided the material,and the fault structures at all levels gave favorable spaces for ore deposits.5.Information from geochemical surveys at different scales was extracted,in particular a variety of geochemical information from the stream sediment survey at a scale of 1: 200,000,and the results extracted from the geochemical data was list as follow:The denudation ratio of the ore deposits could be determined by the ratio of(W + Sn)/(As + Sb).Mineralization information of Pb,Zn and Sn could be distinguished by the contrast map of(Pb + Zn)and the contrast ratio map of(W + Sn)/(Pb + Zn).Residual Normalized Areal Producivity(RNAP = surface metal quantity / background value)could distinguish the main ore-forming elements of ore deposits.The factors combination from factor analysis could divide the geochemical zones in the study area.The similarity graph of the typical deposit could identify unknown mineralization information.6.Prediction areas were delineated.The quantity of A-level prediction area,B-level prediction area were 3,33;and the total amount of resources were 52,500 tons,302.48 million tons,respectively.The verified result has shown some good news.