The Application Of Ground High-Precision Magnetic Method To Search For Iron Mine In Helong

Magnetic prospecting is an effective geophysical method,which is used for measuring and analyzing the magnetic anomalies of rocks and orebodies to identify geological structures and to find useful mineral resources.As one of the earliest geophysical methods,magnetic prospecting has been widely used in comprehensive geological survey,survey prospecting and deep geologic structure,especially in finding ferromagnetic minerals.Under the premise of important prospecting of preferred magnetic anomalies delineated ore prospect areas of Helong ore prospect areas,this article use the ground high-precision magnetic method to initially determine the direction and depth of the unknown iron ore(chemical)body,which can provide an important reference for further exploration of iron ore resources and delineation of iron ore bodies.In order to further understand the geologic structure of the work area and to infer the existence of the unknown ore bodies,the data processing of the magnetic survey data is carried out,such as polarization,continuation,derivation and analytic signal,and combined with engineering data such as geology and drilling to 2.5D inversion of human-computer interaction.Qualitative and quantitative analyze the local anomalies,in order to achieve the elimination of some superficial small magnetic interference,separation of magnetic superposition anomalies,delineate the boundaries and the scope of mineral bodies,more effective and intuitive reflect the magnetic anomalies and magnetic body correspondence.Through the ground high-precision magnetic measurement work,this article has a more in-depth understanding of the abnormality in the study area: There are two kinds of structural features in the C1 survey area,and the north-west tectonics are destroyed by the north-east tectonic reconstruction,indicating that the north-west tectonics in the C-1 survey area are earlier than the north-east tectonics.In the C-7 and C-11 anomaly areas,it was found that the partially covered basalt was crushed and could not form a high magnetic anomaly,and the thickness of the basalts was not big.Magnetic measurements at C-9 indicate that most of the high-magnetic anomalies are related to magnetite or Archaean metamorphic rocks contain some magnetite.The inversion of the profile in the southern part of the C-9 survey area gives a speculation that magnetite exists in the deep part.In C-11,it is also inferred that the magnetic anomaly is mainly due to the Archaean granulite and some of the granulites contain a small amount of magnetite to form a high magnetic anomaly in the survey area.By Integrating Mapgis,Surfer,Geosoft and other professional software and using their respective advantages of the data processing algorithm and graphics processing,they complement each other and allow their systems to be combined to make the final result map elements richer,more accurate.By compiling practical small program through Microsoft Visual Basic compiler,we realized the centralized processing to the correction of GSM-19 T proton magnetometer data.