| Yinkeng area in south of Jiangxi province has undergone multi-stage tectonic and magmatic activities,and it is an important tungsten polymetallic prospecting area in south of Jiangxi province.It is also the most important gold,silver,lead,zinc,copper and manganese prospecting target area in south of Jiangxi province.Previous studies have found that the deposits in Yinkeng area of south of Jiangxi province are closely related to the spatial distribution and genesis of yanshanian granites.The understanding of the spatial distribution characteristics of granite is helpful to reveal the mineralization distribution.Through the study of physical properties,the ground high-precision magnetic method can better judge the different rock conditions in the Yinkeng area,especially the granite,and has a relatively clear expression.In this paper,with the help of the deep exploration project carried out in this area by 1:20,000(in the early stage)and 1:10,000(in the later stage)ground high-precision magnetic survey,the magnetic survey data obtained by the magnetic method were processed,analyzed and interpreted,so as to provide the basis and ideas for determining the spatial relationship of mineralized granite.This paper briefly introduces the geological situation of Yinkeng area,the main contents,working methods,instrument tests before magnetic method work,matters needing attention in magnetic method work,data collection and storage.A series of corrections were made to the obtained magnetic data to obtain magnetic anomalies.The characteristics of magnetic anomalies were preliminarily analyzed according to the magnetic anomaly contour map,and four key magnetic anomaly regions were circled.Then,the magnetic anomalies were filtered,extended analytically and differentiated.The geological causes of magnetic anomalies are analyzed and the underground fault structure is speculated.4 prospecting target areas are circled.It provides the basis for the follow-up prospecting work. |
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