Inversion of high-amplitude magnetic total field anomaly: an application to the Mengku iron-ore deposit, northwest China

Abstract

relative-error (the difference/the magnitude magnetic anomaly) reach 10% with spherical model. They suggest projection anomaly is not credible especially as high-precision of quantitative processing and interpretation are required and propose a method using the error yielded by the projection anomaly. Coleman and Li 29 studied the difference between the errors of the total-field anomaly and magnetic amplitude data and found that the errors in the three orthogonal components converted from the total-field anomaly had similar standard deviations. Based on the total magnetic anomaly is no longer approximately equal to projection anomaly in the highly magnetic environments, Sun et al. 30 used the information from the borehole data and structural orientation as constraints and get an acceptable result. In our study, we define the error between projection anomaly and observed modulus difference anomaly firstly and carefully discuss the error caused by amplitude, inclination and declination individually and together between the projection anomaly results (data processing, inversion and interpretation) with those of the modulus difference anomaly for strong magnetic anomalies. Second, we propose directly inverting for the modulus difference anomaly in strong magnetic bodies under Cartesian coordinate. Third, the operator, given by modulus difference anomaly, is nonlinear which is different with projection anomaly. Finally, the synthetic and field data are used to test the inversion method with two types of total field data.

Suseptibilitas Magnetik Sistem Panasbumi Non Vulkanik Desa Terak Menggunakan Metode Geomagnetik

“…Dalam prospeksi magnetik, anomali medan total merepresentasikan proyeksi vektor anomali magnetik pada medan geomagnetik. Anomali magnetik total digunakan untuk menyederhanakan perhitungan pemodelan ke depan dan inversi data magnetik (Yang et al, 2020). Anomali magnetik medan total peka terhadap magnetisasi struktur sumber lokal (Li et al, 2020).…”

Integrated geophysical prospecting for deep ore detection in the Yongxin gold mining area, Heilongjiang, China

“…However, traditional geological exploration methods face numerous limitations, making the discovery of new ore deposits increasingly challenging. This underscores the critical importance of high-precision, high-resolution, and user-friendly geophysical detection methods [3][4][5][6] . Among these methods, audio-frequency magnetotelluric (AMT) stands out due to its numerous advantages, including high operational efficiency, excellent exploration depth, the capability to penetrate high-resistance layers, robust resolution for low-resistance layers, strong lateral resolution, and well-developed data processing and interpretation technologies 7,8 .…”

A proposed new Precambrian skarn deposits in the Arabian shield

“…There are different types of post-Murdama granites, so there's a higher possibility for the skarn deposits at the contact between these intrusions and the Murdama limestone. for estimating the sedimentary cover thickness (Aboud, 2012), and ore deposits exploration (Essa et al, 2022;Gobashy et al, 2020;Mehanee et el., 2021;Yang et al, 2020). Consequently, magnetic data has been applied to skarn deposits exploration (Gunn and Dentith, 1997;Martelet et al, 2021).…”