Magnetic parameter measurement method without requirement for accurate prediction of geomagnetic inclination and for rock and ore samples

Abstract

The invention provides a magnetic parameter measurement method without requirement for accurate prediction of a geomagnetic inclination and for rock and ore samples. The magnetic parameter measurement method comprises the following steps: (1), the geomagnetic inclination of a measured place is estimated to be I through checking of a geomagnetic map or an approximation formula; (2), a measurement device is vertically arranged on a nonmagnetic panel or bracket, and a normal geomagnetic total field I0 is measured with a total field magnetometer; (3), a sample box filled with the rock and ore samples is arranged in a groove of the measurement device, and the rock and ore samples are located in the middle inside the sample box; (4), sides of an isosceles triangle frame in the measurement device are adjusted; (5), a negative sample box surface in an X axis of the sample box faces east, and positive sample box surfaces in the other two coordinate axes of the sample box point to probes respectively; (6), the volume v of the samples in the sample box is measured; (7), the estimated geomagnetic inclination I, a central distance r, 24 magnetic field values and the volume v are substituted into a formula respectively to obtain the magnetic susceptibility kappa of the sample, the residual magnetization modulus Jr, the residual magnetic declination phi and the residual magnetic inclination theta. The magnetic parameter measurement method can solve the problems in the prior art.

Description

technical field [0001] The invention relates to geophysical magnetic prospecting technology, which is a method for measuring magnetic parameters of rock ore samples without accurately predicting the geomagnetic inclination angle. Background technique [0002] The magnetic parameters of rock ore include magnetic susceptibility and residual magnetization. At present, the magnetic susceptibility is mostly measured directly by the magnetic susceptibility meter, and the residual magnetization can only be measured by the oblique measurement method of the total field magnetometer based on the geomagnetic dip. This oblique measurement method requires that the central axis of the tested specimen is strictly aligned with the center of the total field magnetometer measuring probe with the inclination of the local magnetic inclination, and the rock ore specimen must be turned over on the inclination that is strictly consistent with the inclination of the geomagnetic field. The disadvant...

AI Technical Summary

Problems solved by technology

The disadvantage of this measurement method is that it is necessary to accurately predict the geomagnetic inclination of the sample measurement site, so that the inclination device can accurately adjust the inclination of the sample plate to be equal to the inclination of the field. Since most survey units do not have the ability to measure the geomagnetic inclination in the field, they usually use Checking the geomagnetic map or approximate formula to estimate the geomagnetic inclination often leads to a large deviation from the actual geomagnetic inclination value, resulting in large uncertainties in the measurement results of magnetic parameters and low measurement accuracy

Although this method has the advantage of not needing to predict the geomagnetic inclination parameters of the measured ground, it is found that the method has disadvantages such as relatively large measuring devices and prone to deviations in the rotation and positioning of the blades of the device during use.

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