The Characteristics Of Airborne Magnetic Anomalies And The Prediction Of Dongping-Wenshang Metallogenic Belt

Dongping – Wenshang metallogenic belt is located in the luxi uplift zone which at the north China plate southeast edge.The region has good metallogenic conditions.About all large and medium-sized iron deposits in Shandong province is distributed in the luxi area.Dongping–Wenshang metallogenic belt,more than ten large or medium-sized iron deposits such as Zhangbaozhuang,Pengji,Liguanji and so on in the region,is a important orefield and has the high economic and research value.However,some factors to the disadvantage of futher prospecting,for example the thick quaternary system and the tanglesome structure.The author accomplished this paper depend on the project named The Aeromagnetic Survey In The Adjacent Areas Of Lu-Yu-Wan Province.Based on results and theoretical basis of previous research and according to the airborne magnetic survey data,the author carry out the field inspection work.By processing high-precision aeromagnetic data,the paper pointed out that The study area is located in the magnetic anomaly zone which has the characteristic of positive and negative changes.The masses of anomalies is very complicated,but have a common traits roughly that they have NW,NE or SN strike.Ars is the principal reason for most positive magnetic anomalies,and some positive anomalies caused by Iron ore.Most negative magnetic anomalies is because of depression area covered by thick quaternary system.According to the map processed by the methods of potential field transformation,The author draw the three level fracture,a total of 27,and several magnetic metamorphic belt,and through research that the metamorphic belt related to mineralization can be extended northward to the Xulou area and cut off by the Dong'e fault and westward to the south area in the Liangshan county.Then the 174 anomalies be extracted and classified by the method of the aeromagnetic information combined with the previous geological data.Afterwards,by means of the inverse fitting(2.5D),we can obtain Quantitative interpretation for key prospecting anomalies and determine the spatial distribution of the morphology of magnetic body,buried depth,magnetic intensity and other parameters.Finally,the author utilize the results above combined with the known ore deposit characteristics to establish the ore-prospecting criteria and select the prospecting prediction areas.This paper expanded the scope of Dongping – Wenshang metallogenic belt,then established the ore-prospecting criteria,selected eight target areas for prospecting.The authou hope for it can provide reference for the future prospecting.