大兴安岭北东段森林沼泽区地球化学找矿方法研究:以黑龙江省二道坎村银多金属矿区为例OA北大核心CSTPCD

In the shallow forest-swamp overlying area of Erdaokan,Heilongjiang Province,the experimental study on the technical profile of soil and rock debris measurement and sampling methods was carried out by us-ing the method of comparative analysis of different sample sizes in B and C layers.The samples of-5～+20 mesh,-20～+60 mesh and-60 mesh were selected.The differences in geochemical characteristics,element combination and anomaly delineation of each element in different sample sizes were also compared.The results show that the geochemical anomalies of ore-forming elements delineated by different sized samples have the characteristics of Ag-Pb-Zn-Mn multi-element anomaly combination,and the distribution range of anomalies is consistent with the deep ore body,and the element concentration center is in good agreement with the spatial lo-cation of the deep ore body,indicating that the ore-body can be effectively indicated by rock debris and soil sur-vey.It can be used as an effective means to find silver-lead-zinc deposits in this area.Through the study,the measurement results of C-20～+60 mesh rock cuttings collected in the mining area are higher and better,which are manifested in higher element content,stronger anomaly intensity,more obvious indication of element combi-nation,and more accurate ore body positioning,which can strengthen the weak soil anomaly,and is conducive to the discovery and identification of weak mineralization information.Therefore,the sampling method of-20～+60 mesh cuttings is suitable for geochemical survey in the study area,which provides a technical basis for the detailed survey of 1∶10 000 geochemical exploration in forest-swamp overlying region including the Er-daokanzi and Duobaoshan ore concentration areas.