Geophysical And Geochemical Characteristics Of Gabon Longma Silver Deposit In The Tuotuohe Area,Qinghai Province

Gabon Longma Silver Deposit is located in the southern edge of tanggula landmass,and the geotectonic location is located in the composite arc-basin belt of tuohe-variegated Paleozoic and Mesozoic.It is adjacent to the late Paleozoic suture belt of jinulan-yushu in the north,tanggula block in the south,and the tectonic pattern of the arc-basin system is relatively clear.The strata,magma-tectonics are developed,and the metallogenic conditions are good.The regional bouguer gravity anomaly is mainly manifested as low gravity field,which is the reflection of mantle depression and uplift.The background magnetic anomalies in the region are mainly the reflection of weak magnetic layers of Mesozoic Jurassic clastic rock and carbonate rock with large sedimentary thickness.It is concluded that it is caused by the later intrusion of granite,which reflects the development process accompanied by the small tanggulatai depression and uplift,and the relatively strong characteristics of fracture,folding structure and granitic magmatic activity.Area of 1/20 stream sediment survey results show that the tuotuo river on the general is in a huge geochemical block in the body,regional geochemical anomalies with Pb,zinc,Ag,Hg,Fe,prospecting effect very good,the overall distribution is consistent with the tectonic line(in the north west,nearly east-west)and controlled by the ore-bearing strata and fracture structure is obvious.Gabon Longma delineating the synthesis 1:50000 stream sediment anomaly of Au,Ag,Sb,Hg element size,the intensity is high,the major elements of the abnormal high peak,thick concentrated heart clear,with high soil zones in 1:10000 geochemical profile combination of elements are consistent,no abnormal fracture tectonic belt,the mineralization and alteration zone height,examined to determine the geochemical anomalies of metallogenic facts.The low resistivity and high polarization IP anomalies delineated in the jiapulongma mine area are determined as ore-induced anomalies,which have certain indicating significance for searching silver deposits in this area.Gabon Longma region of low resistance and high polarization IP anomalies and geochemical anomalies of different scale are to mineralization anomalies,ore-forming elements such as precious metals and base metals,mercury and antimony,formed in the stretch tension-environment,orebody are obviously controlled by fracture structure,on the one hand,the formation of the ore body is associated with tectonic hydrothermal,on the other hand,and the formation of the deposit and magmatic hydrothermal ore bodies also have certain relations,so the deposit is forming and tension-stretching environment,abnormal elements is given priority to with low temperature element combination,obviously controlled by fracture structure,and closely associated with magma activity,and its genetic type is Medium-low temperature hydrothermal vein-typed Ag Polymetallic deposit.