Metallogenic Geological Conditions And Metallogenic Prognosis Of The Sanxingshan Area In Heilongjiang Province

The Sanxingshan area that in Lesser Khingan Range-Zhangguangcai Range magma arc,is located in the combining site of Songnen massif and Yichun-Yanshou magma arc.The geological structure is complex.It's rich of mineral resources.This paper is based on 1:50000 regional geology and mineral resources survey.This study integrates the comprehensive information of geology,geophysics,geochemistry and remote sensing,metallogenic geological conditions.According to the comprehensive information metallogenic prediction theory,it divides the promising prospecting areas.Some understandings have been found out from this research:The skarn deposits are represented by the Cuihongshan iron polymetallic deposit.The ore body occurs in the intrusion contact zone between the Early Jurassic monzogranite and Qianshan group,which has been controlled by NE and NW trend faults.The main wall-rock alterations include skarnization,epidotization,chloritization,fluoritization,and serpentinization.The high gravity and the magnetic anomaies indicate that the mineralization.The epithermal deposits are represented by the Youyijingyingsuo gold spot.The ore body occurs in the Early Cretaceous volcanic rocks,which has been controlled by NE and NW trend faults and ring structure.The main wall-rock alterations include pyritization and siliconization.The analytic result of 1:50000 stream sediments show that element anomaly associations distributed along the NE trend and shows the banded distribution.There are 3-4km distribution between anomalous bands.The anomaly associations distribute near the structure often.Au,W,Mo,Ag,Mn,Ag,Sn,Bi have great mineralization potential in Early Cretaceous,and Au,Mn,Bi are the same in Erlanghe group in Jurassic,and this paper delineates 53 element anomaly associations.The aeromagnetic anomalies are mainly positive anomalies in this area,in which the negative magnetic anomalies are scattered,according to aeromagnetic anomaly results.12 aeromagnetic anomalies have been divided.The HC-M2,HC-M3,HC-M4,HC-M5 may be related to the skarn deposits,and the others may be related to the epithermal deposits.The main structures of the study area are identified,a large number of ring structures related to Mesozoic volcanic activity have been identified.The fault structure is dominated by SN,NE,NW and EW trends,and the SN trend faults are passable structure,the NE and NW trends faults are ore-depositing structures.The ring structure occurs in the Mesozoic volcanic rocks are leaded by the volcanic structure.The geology,geophysics,geochemistry and remote sensing information are comprehensive analyzed.This paper has divided 7 metallogenic prospect areas,I,II grade mineralization prospecting area 1,and III grade 5.The prospecting direction of I-1,II-1,III-2,III-3 are sharn deposits,and III-1,III-4,III-5 are epithermal deposits.