Application Of Magnetics To Gold And Ploymetallic Prospecting In The Northern Part Of Daxing'anling Mountains

Magnetic prospecting including the ground, air, sea and magnetic prospecting of a test track, is the most common method of the geophysical exploration, which is mainly used in the search for iron, copper, lead-zinc metal in the mineral resources, and it is also used in geologic mapping and geological structure investigating. Until now, the iron bed, erzmetall bed and oil-field for our country have been exploring a large number of magnetic prospecting and the study made a great achievement. Magnetic techniques is also a basic geophysical exploration, have been incorporated in the plan of the system of measurement of countries and basicly covers all important areas.Construction and magmatic activities of the area are very active, gold and polymetal ore-forming effects are on productivity, we study on a magnetic anomaly features, gold and polymetal mineral exploration cruise a magnetic anomaly in the filter and a warrant, which is a breakthrough significance for searching for the gold and polymetal in Daxing'anling oreforming belt.The area is located in the workplace of Argun-Daxing'anling oreforming belt, including Argun mining areas and Daxinganling mining areas, betwee the two districts is the Huanyu-Xinlin ophiolites belt. Early mesozoic geologic space structure is like the Daxing'anling arc system, and the old bottom of crystallization is an ancient terrains of island arc constitute a basis for the system of rock. Early palaeozoic is mainly bulided by the island arc and the sediment of arc volcano, Late palaeozoic is mainly builted of the broken of sedimentary basins hinder. Since mesozoic,due to the control of the pacific plate, forming the forland basin of Mohe and offshore volcanic arc, had been superimposed on Tianshan-Xingmeng. In the long period of geological structure evolution the shell material energy exchange is active, the earth's crust contractes strongly in the courses of hill-forming, structure combine zone, thrusting nappe zone and strike-slip fracture zone is usually seen in this area.This article in supported by the programme of geological investigation institute and the resource project in the province, through cruising with a magnetic anomaly filter level 3 and level 2 exception, we discovered the important mineralization clues of gold and bronze polymetal, indicated that the magnetic prospecting is a fast and effective way to look for gold and polymetal mines in Daxing'anling region.In north of Daxing'anling, to screening of the aeromagnetic anomalies, choose the favorable abnormalities of conditions metallogenic, verification three-tier abnormal; unfolding the secondary abnormal verified for three-tier abnormal. Process secondary abnormal, three-tier abnormal and engineering construction, The 6 exploratory trench slot construction for anomaly of C-2009-10557 at Heilongjiang in 2010. The engineering expose found rock saw a peacock petrochemical, local silliconization and pyrite change also more development. For the number of TC557 anomaly revealed, The stage appear small pyrite granular, erythema shape in granite in north-west locally. According to the basic analysis results, in TC557-04 exploratory trench irisout the 3 low-grade copper ore body,3 copper mineralized zone:The first mineralization 58.40 m, The Average of Cu grade is 0.106% and 2 strip of 2.00 m wide low-grade copper body is circle of. The second mineralization 4.00 m, the Average is 0.116%, the third mineralization 14.00 m, the Average of Cu grade is 0.121% and one strip of 1.00 m wide low-grade copper body is circle of. In TC557-02 exploratory trench irisout the 1 low-grade copper ore body, The first mineralization 15.00 m, The Average of Cu grade is 0.146% and 1 strip of 4.00 m wide low-grade copper body is circle of, average Cu grade 0.232%; The second mineralization 5.00 m, The Average is 0.112%. In TC557-07 exploratory trench irisout of the 5 mineralized zone of molybdenum:the first mineralization 2.00 m, the average of Cu grade is 0.014%, the second mineralization 4.30 m, the average of Cu grade is 0.013%, the third mineralization 3.00 m, the average of Cu grade is 0.012%, the forth mineralization 3.00 m, the average of Cu grade is 0.017%, the fifh mineralization 4.00 m, the average of Cu grade is 0.022%.Carry out the check and engineering expose of secondary, three-level anomalies for the aeromagnetic anomalies of C14. In the place where the 10Ht-4 anomalies concentration center is identical with the geophysical prospecting and IP concentration center to expose Slot Ethan engineering. Then find a gold mineralization body whose average grade is 0.3×10-6, oblique thick is one meter. Fu ore rock is Fracturing granite which has strong pyrite mineralization. It's pyrite is disseminated and it's crystallinity is high. It's about 0.5mm having silicification and it Show diffuse shape. There are six gold mineralization which is bigger than (0.1～0.3)×10-6.The results show that through verification screening and aeromagnetic anomalies, it is the benefit of finding the gold and polymetallic mineralized zone and ore body in a shorter time. It is an important way to obtain prospecting breakthrough. On the basis of the data of deposit, mineral occurrence, mineralization point we have already got and 160 aeromagnetic anomalies we verified in 2010, we have summarized the principle, methods and rules of aeromagnetic screening. In order to provide basis for "Heilongjiang and mohe river-tahe area aerogeophysical anomalies verify" and "Heilongjiang daxinganling area 1:50000 aerogeophysical measurement anomaly investigation and verification.As well as providing guidance for" Xiaoxinganling mountain area Aeromagnetic anomalies investigate and verify" item's abnormal screening.