Investigation of 3D magnetisation of a dolerite intrusion using airborne full tensor magnetic gradiometry (FTMG) data

Queitsch, Matthias; Schiffler, Markus; Stolz, R.; Rolf, Christian; Meyer, Matthias; Kukowski, Nina

doi:10.1093/gji/ggz104

Cited by 9 publications

(12 citation statements)

References 36 publications

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“…There are too many parameters related to the output of planar SQUID gradiometers in equation (2). In order to calibrate the gradiometers accurately, it is necessary to simplify the equation under specific conditions.…”

Section: Calibration Methodsmentioning

confidence: 99%

“…Compared to total magnetic intensity, the magnetic gradient tensor (MGT) has a number of advantages in precise localization and inversion of magnetized objects [1,2]. These advantages include higher spatial resolution, directional information, and thus more detailed anomaly delineation, and a significantly better-constrained solution space for magnetic * Author to whom any correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

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Calibration method for planar SQUID gradiometers based on the magnetic gradient tensor components

Liu

Jia

et al. 2023

Meas. Sci. Technol.

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The accuracy of Tesla/Volt calibration factors for SQUID gradiometers is essential to take advantage of magnetic gradient tensor (MGT), but the accuracy of the published calibration procedures rang from tenths of per cent to a few per cent. In this paper, we propose an efficient calibration method for planar SQUID gradiometers based on the MGT components. The factors affecting the calibration accuracy and the optimal inclination angle for calibration were investigated by analyzing the response characteristics of planar SQUID gradiometers to the MGT components. By superposition of square coils and gridding of pickup loops, numerical models of the response of planar gradiometer in different types of Maxwell coils were built to simulate theoretical calibration accuracy and calibration errors due to position, attitude and imbalance. We built a calibration setup to achieve high precision simultaneous calibration of multi-channel planar SQUID gradiometers and investigated the effect of eddy current on the calibration accuracy. The results show that simulation and experimental results were in general agreement by taking into account various error factors, and a calibration error of about 0.4% was achieved.

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Section: Calibration Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Calibration method for planar SQUID gradiometers based on the magnetic gradient tensor components

Liu

Jia

et al. 2023

Meas. Sci. Technol.

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“…There is a number of commercial tools for the inversion of MGT data such as Geosoft ® VOXI™ Earth Modelling, VPmg™ [172], TensorResearch ModelVision™, Advanced Geophysical Inversion Centre at Mira Geoscience Ltd, Tech-noImaging LLC ® EMVision ® [166,173], Intrepid Geophysics (3D GeoModeller™) as well as academic tools such as UBC SimPEG [174], Zhdanov's group at University of Utah and others [104,175]. A number of examples of inversions of SQUID based FTMG data have already been made [104,[175][176][177] starting by Zhdanov [178] in 2012.…”

Section: The Inversion and Interpretation Of Mgt Data Goes Three Main...mentioning

confidence: 99%

Superconducting sensors and methods in geophysical applications

Stolz

Schmelz

Zakosarenko³

et al. 2021

Supercond. Sci. Technol.

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More than 50 years ago superconducting quantum interference devices (SQUIDs) were invented. Since then many applications opened up. Already in a 1980 workshop (Weinstock and Overton 1981 SQUID Applications to Geophysics (Society of Exploration Geophysicists)) the application of SQUIDs in geosciences was reviewed. The fabrication and cooling technologies, electronics and other SQUID system components underwent significant improvement within the past years. Thus, SQUIDs are today better suited, more sensitive and effective as well as robust and reliable in operation for geophysical measurements. Many successful application examples, demonstrations and discoveries of mineral resources have been made using them in laboratory devices for investigation of magnetic properties, magnetic exploration, transient electromagnetics and for superconducting gravimeters as well as gravity gradiometers. Therefore, this article intends to review the past, present, and some future aspects of SQUIDs in geo-scientific applications such as e.g. mineral exploration. Since this field is still very active and quite a number of developments are ongoing, this review cannot be comprehensive.

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“…While light and portable, fluxgate‐based systems are directional and do not provide an absolute measurement of the magnetic field (Dossing et al ., 2021). Superconducting quantum interference devices (SQUIDs), which are also directional sensors, offer the highest sensitivity levels and absolute measurements but have limitations due to the use of liquid coolants (Munschy and Fleury, 2011; Queitsch et al ., 2019; Stolz et al ., 2021). A full‐tensor magnetic gradiometer (FTMG) survey measures the gradient of each vector component of the magnetic field at a point but is incapable of detecting long‐wavelength anomalies observed by standard scalar systems.…”

Section: Introductionmentioning

confidence: 99%

Locating skarns with magnetic survey data, Geyer, Erzgebirge: optimizing data acquisition procedures

Ugalde

Morris

Madriz

et al. 2022

Geophysical Prospecting

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Magnetic data can be acquired from a number of different platforms (e.g., ground, drone, helicopter) using a variety of sensors (e.g., caesium vapour‐type optically pumped magnetometers, fluxgate, superconducting quantum interference devices) with different flight line configurations. To detect a magnetic anomaly associated with a mineral commodity that is not exposed but is thought to be associated with the anomalous magnetic mineral content, it is necessary to optimize the survey parameters through a complete data integration process. Prior petrophysical measurements provide insight into the physical contrast that might be expected between adjacent lithologic units and between the ore zone and the encompassing lithology. Oriented rock samples provide access to magnetic remanence data through palaeomagnetic laboratory measurements. Knowing the typical morphology of the ore zone one can compute a forward model of the expected anomalous response and determine which combination of survey parameters provides the highest probability of detecting the commodity being sought. In this study, we analyse magnetic patterns associated with thin dipping skarn bodies from the Geyer mining district in Erzgebirge, Germany. Petrophysical measurements indicate that the skarns are more magnetic than the surrounding host rock. Partially oriented samples from a bore core record a Variscan age metamorphic remanence. Forward modelling indicates that clusters of skarn bodies are required to produce a reliably detectable magnetic signal. Ground, or low elevation drone surveys are needed to detect these anomalies with standard scalar‐type optically pumped magnetometer or fluxgate magnetic surveys. The enhanced spatial resolution and long‐wavelength rejection of a superconducting quantum interference device based full‐tensor magnetic gradiometer provide an improvement over optically pumped magnetometers for an aircraft‐based survey platform.

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Investigation of 3D magnetisation of a dolerite intrusion using airborne full tensor magnetic gradiometry (FTMG) data

Cited by 9 publications

References 36 publications

Calibration method for planar SQUID gradiometers based on the magnetic gradient tensor components

Calibration method for planar SQUID gradiometers based on the magnetic gradient tensor components

Superconducting sensors and methods in geophysical applications

Locating skarns with magnetic survey data, Geyer, Erzgebirge: optimizing data acquisition procedures

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