Abstract

Abstract One of the difficulties in interpreting magnetic anomaly data is the distortion caused by rock body magnetization. There have been several successful studies carried out on the estimation of body magnetization based on the correlation of the Bouguer and magnetic anomaly data. A number of other significant research projects have aimed at identifying the effect of remanent magnetization in magnetic data only. In this paper, we present a threedimensional method for determining the body magnetization direction by means of comparing the amplitude of the analytic signal with the horizontal gradient of pseudogravity of magnetic anomaly using the correlation coefficient equation. The method has been successfully applied to test cases and is applied here to the aeromagnetic anomalies located in northern Central Turkey. Anomalies displaying individual polarities were separated out and correlated with themselves using the correlation coefficient equation. Counter-clockwise rotations in the range of 3° and 174° were determined. Clockwise rotations were determined in the range of 19° and 153°. The inclination of the body magnetization directions for one of the blocks was estimated to be 68.4°, while all other blocks had a low inclination angle of body magnetization in the range of 32° to 57°. These results may imply that these blocks gained their magnetizations when Turkey was at low latitudes. Possible buried faults are also identified. The results reported here comply with the new mobilistic theory.

Highlights

  • One of the earliest and significant studies aimed at identifying the remanent magnetization direction was published by Zeitz and Henderson (1956), who interpreted the shape of the anomalies to estimate the body magnetization

  • In the test cases reported here, we have demonstrated that our method of estimating the direction of the magnetization was succesful

  • When a 7% random error introduced into the coordinates of the three close anomalies, the declination and inclination angles of the body magnetization were estimated at 77◦ and 54.5◦, respectively

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Summary

Introduction

One of the earliest and significant studies aimed at identifying the remanent magnetization direction was published by Zeitz and Henderson (1956), who interpreted the shape of the anomalies to estimate the body magnetization. Bilim and Ates (1999) correlated the Bouguer and pseudogravity anomaly data of the same area to estimate the magnetization direction Their method was sensitive to the ratio of density to magnetization (ρ/J ). 2. The Method The method proposed in this paper is similar to that proposed by Roest and Pilkington (1993) who determined the direction of magnetization using the cross correlation of the analytic signal with the horizontal derivative of the pseudogravity of magnetic data. The correlation coefficient equation (r ) of Meyer (1965) has recently been used to determine the direction of body magnetization from the Bouguer and magnetic anomaly data (Bilim and Ates, 2004).

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Discussion and Conclusions

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