Synthetic Information Prediction Of Silver Polymetallic Deposit In Shengshanlinchang Area,Nenjiang County,Heilongjiang Province

The paper relies on four regional geological and mineral resources survey projects of1:50000 Hongshuichazi etc in Heilongjiang province.During the research paper,I applied geological,geophysical,geochemical,remote sensing and comprehensive qualitative information prediction method to predict metallogenic.The study area is located at the intersection of Nenjiang-Heihe tectonic melange belt,Songnen massif and Longjiang-Taxi magmatic arc belt,and belongs to the Xiaoxing'anling gold-silver-lead-zinc-molybdenum metallogenic belt.By geological,geophysical,geochemical and remote sensing of 1:50000 scale,the stratum is divided into11 mapping units,The stratum related to mineralization are the Dashizhai?P₁d?,and the lithology is Fluvial tuff;The intrusive rocks are divided into 6 ages and 11 mapping units,Among them,the intrusive rocks related to mineralization are Early Cretaceous intrusive rocks and dykes;The faults and folds structures are developed in the area,and the structures related to mineralization are mainly northwest and northeast structures.By1:50000 aeromagnetic survey,has demarcated 6 magnetic anomaly and interpreted 15fault structures;By 1:50000 tream sediment survey,has demarcated 91 drainage combination anomaly.By 1:20000 geophysical prospecting work,has demarcated 22magnetic anomaly,26 chargeability anomaly and interpreted 15 fault structures.By1:20000 geochemical work,has demarcated 60 soil combination anomaly.Thecombination anomaly of drainage and soilis mostly dominated by Ag,Pb,Zn and Mo elements.There are a few ore deposits in the study area.In the paper,The Sandaoliangshan Ag-polymetallic deposit is taken as a typical deposit to study.According to the comprehensive multi-source metallogenic information in the study area,The silver polymetallic deposits in the study area are medium-low temperature hydrothermal type,the main ore-bearing stratum are Dashizhai?P₁d?,and the source rock is Fluvial tuff.The formation of Ag-polymetallic ore bodies in this area is related to fault structures and early Cretaceous magmatic activities.The NW and NE fault structures provided migration channels for hydrothermal fluids,the NW faults structures provide ore-hosting space,and the Early Cretaceous magmatic hydrothermal fluids provided ore-forming elements,heat sources and power.At the same time,the ore-forming elements in the rhyolitic clastic tuff of the Dashizhai stratum?P₁d?are activated.Mineralization,migration and local enrichment lead to mineralization under favorable geological tectonic environment.Among them,mineralization and alteration related to silver polymetallic deposits are mainly silicification,molybdenum mineralization,chloritization,limonization,carbonation and pyritization;The apparent polarizability anomalies are mainly characterized by relatively medium to high polarizability and medium resistivity;The magnetic field is characterized by background negative magnetic field;The soil geochemical characteristics are characterized by combination of Au,Ag,Pb,Zn and Mo,high intensity and partial difference.There are obvious combinatorial anomalies in the zones of normal development and inner zones,which are in consistent with the position of apparent polarizability anomalies.According to the principle of metallogenic prognosis area,4 stages of metallogenic prediction area are demarcated in the study area,which are the prediction prospects of Sishengshan,Sandaoliangshan,Laoyaoshan and Shengshanlinchang.Since the Shengshanlin survey area is located in the nature reserve,the target area is preferred only in the other three prediction areas mentioned above.Under the guidance of comprehensive information prospecting model,according to the principle of grade classification of prospecting targets,The B prospecting targets are demarcated for 3 places in the study area,which are the target area of Sishengshan,Sandaoliangshan,Laoyaoshan.The prospecting area in the target area has been optimized,to use the surface engineering.In the study area,It has been found that a new industrial grade Silver ore body and multiple Silver mineralizers.The average and maximum grade of the Silver ore body was respectively 55.49 x 10^-6 and 69.36 x 10^-6;It has been found that the grade of a new Mo industrial grade ore body was 0.063 x 10^-2;It has been found that the grade of a new Pb mineralization body was 0.13 x 10^-2.