Analysis And Application Of Aeromagnetic △T Anomaly Feature

The magnetic anomaly field studied in magnetic prospecting, mostly pertain to the local magnetic anomalies in the crust, namely the magnetic field of magnetic geologic body. The morphological character of space distribution on shallow ground of these magnetic geologic body are controlled directly by factors of shape, size, formation state, magnetic intensity of local magnetic geologic body and so on. Therefore, in order to understand the character of the underground terrane and rockmass of distribution, conformation and mineral distributing ,we can analyse and estimate the character of the magnetic anomaly we surveyed.Since the majority of textbooks and reference literatures about the analysis ofâ–³T character in plane and space of aeromagnetic survey are less, the aeromagnetic and ground magnetic data is lack of reference in interpretation and inference. In this paper, we through self-programing to calculate theâ–³T anomaly of variety rules magnetic body , theoretically discussed the profiles, plane, the cross section features ofâ–³T anomaly of variety rules magnetic body.In this paper, firstly, we discussedâ–³T anomaly of various rules magnetic body , and concluded that the contour shape of a single magneticâ–³T anomalies can be roughly divided into three types: long strip, equiaxed and elliptical; Main profile curve has three basic forms: both sides of theâ–³T curve with no negative anomalies , one side of theâ–³T curve with negative abnormal, and negative anomaly on both sides of theâ–³T curve.In addition, comparingâ–³T and Z a anomaly, we obtained that the curve shape ofâ–³T and Z a anomaly in the plane, profile, cross section is similar, the difference between them is in the main profile the absolute value of a minimum value ofâ–³T anomaly is greater than that of Z a anomaly .And the zero value contour line of â–³T anomaly is a curve, dividing the anomaly into two parts of positive and negative, while the one of Z a anomaly is closed, surround the positive anomalies, the negative range ofâ–³T anomaly is less than Z a anomaly .Lastly, the results of the study were applied to the inversion calculation of NiXiong region , and the results are consistent with the drilling profiles.Theoretical models together with actual data applications show that the research has been done in this paper with some guidance for the interpretation and inference of the aeromagnetic and ground magnetic survey data .