Abstract
Processing and interpretation of magnetic data usually require information of total magnetization direction. However, under the effects of remanant magnetization, total magnetization direction is different from induced magnetization direction, which makes data processing and interpretation complexity. In this paper, we present a new method by cross-correlation of magnetic dipole source for determination of magnetization direction from relatively isolated and approximate equiaxial magnetic total field anomaly. This method calculates cross-correlation coefficient between observed magnetic total field anomaly and theoretical magnetic total field anomaly caused by a magnetic dipole source, by using a set of varying parameters of positions and total magnetization direction of dipole source for trial and error. The corresponding magnetization direction of maximum correlation coefficient is regarded as estimated total magnetization direction. Tests on both synthetic data and aeromagnetic data of a mineral exploration in northwestern China indicate this method reliably and effectively estimates the magnetization direction from relatively isolated and approximate equiaxial magnetic total field anomaly.
Highlights
In mineral exploration, data processing and interpretation of magnetic data, such as reduction to pole, forward modeling and inversion, usually require known magnetization direction
If the effect of remanent magnetization is not taken into account, the direction of present-day geomagnetic field is adopted as total magnetization direction for data processing and interpretation, errors will appear in results which deviate from real geology
We propose a new method of cross-correlation by a magnetic dipole (CMD) for estimating the magnetization direction from relatively isolated and approximate equiaxial magnetic total field anomaly, based on 3D correlation imaging for gravity and magnetic data [7,8,9]
Summary
Data processing and interpretation of magnetic data, such as reduction to pole, forward modeling and inversion, usually require known magnetization direction. Dannemiller and Li [5] presented a method based upon cross-correlation between vertical gradient and analytic signal of magnetic reduction to the pole (RTP) obtained through a set of trial directions. Gerovska [6] suggested a method based on cross-correlation between the RTP anomaly for tentative values of magnetization direction and total magnitude magnetic anomaly. These methods still have some practical issues and problems, such as requiring the magnetization direction of survey area is relatively constant, lowlatitude regions need special reduction to pole method and poor antinoise ability, so far failed to be widely application. We test the CMD method on aeromagnetic data from a mineral exploration in northwestern China
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