Application of TEM Based on HTS SQUID Magnetometer in Deep Geological Structure Exploration in the Baiyun Gold Deposit, NE China

Wu, James J.; Chen, Xiaodong; Yi, Yang; Zhi, Qingquan; Wang, Xingchun; Zhang, Jie; Deng, Xin; Zhao, Yi; Huang, Yue

doi:10.1007/s12583-020-1086-3

Cited by 10 publications

(3 citation statements)

References 28 publications

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“…The Galaxian Formation is mainly composed of schist and granulite, which have middle to high resistivity. The strata have high chargeability due to the wide presence of graphite and pyrite [42]. In order to evaluate its deep metallogenic potential, the TEM survey was applied to the exploration of its strata and structures.…”

Section: A Field Example: Baiyun Gold Depositmentioning

confidence: 99%

Improving Inversion Quality of IP-Affected TEM Data Using Dual Source

Zhi

et al. 2022

Minerals

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The induced polarization (IP) effects in transient electromagnetic (TEM) responses pose difficulties to the TEM data interpretation and inversion. The IP effects break the monotony in TEM decay curves and can even cause sign reversals and lead to the singularity and non-monotony of inversion. The singularity problem is still urgent to be solved. In this paper, the forward modeling method of IP-affected TEM responses is developed using the Cole–Cole model and a frequency-time domain transformation. A TEM data acquisition scheme using a dual-source method without a significant increase in field work is proposed to weaken the singularity and improve the inversion quality finally. Based on the modeling and analysis, the dual-source scheme is designed to guarantee all stations be measured twice with different loops. The joint inversion of dual-source datasets is realized by using an objective combing function and the particle swarm optimization (PSO) algorithm. The synthetic data test proved the validity of the algorithm and illustrated that the joint dual-source method greatly weakened the singularity and stabilized the inversion. The field example of the Baiyun golden deposit showed well consistency with resistivity logging and TEM logging results and predicted the gold mineralization below 2000 m.

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Section: A Field Example: Baiyun Gold Depositmentioning

confidence: 99%

Improving Inversion Quality of IP-Affected TEM Data Using Dual Source

Zhi

et al. 2022

Minerals

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“…In seawater intrusion investigations, it is an effective method for mapping the fresh/saline water interface and for locating the depth of freshwater aquifer (El-Kaliouby & Abdalla, 2015;Kontar & Ozorovich, 2006). In mineral exploration, TEM is suitable for a variety of rare mineral resources with good electrical conductivity (Guo et al, 2020;Wu et al, 2021Wu et al, , 2022. TEM has also proved to be a successful tool in oil exploration (Strack et al, 1990;Ziolkowski et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Bayesian inversion and uncertainty analysis of transient electromagnetic data

Zhang,

Sun,

Liu

et al. 2024

Near Surface Geophysics

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Quantification of non‐uniqueness and uncertainty is important for transient electromagnetism (TEM). To address this issue, we develop a trans‐dimensional Bayesian inversion schema for TEM data interpretation. The trans‐dimensional posterior probability density (PPD) offers a solution to model selection and quantifies parameter uncertainty resulting from the model selection from all possible models rather than determining a single model. We use the reversible‐jump Markov chain Monte Carlo sampler to draw ensembles of models to approximate PPD. In addition to providing reasonable model selection, we address the reliability of the inversion results for uncertainty analysis. This strategy offers reasonable guidance when interpreting the inversion results. We make the following improvements in this paper. First, in terms of algorithmic acceleration, we use the nonlinear optimization inversion results as the initial model and implement the multi‐chain parallel method. Second, we develop double factors to control the sampling step size of the proposed distribution, so that the sampling models cover the high‐probability region of the parameter space as much as possible. Finally, we provide the potential scale reduction factor‐η convergence criteria to assess the convergence of the samples and ensure the rationality of the output models. The proposed methodology is first tested on synthetic data and subsequently applied to a field dataset. The TEM inversion results show that probability inversion can provide reliable references for data interpretation through uncertainty analysis.

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“…High-sensitivity magnetic field measurement plays a significant role in fields ranging from physics to medicine [1][2][3][4][5]. Owing to their exceptional advantages, such as the high sensitivity of about 1 fT/Hz 1/2 and wide bandwidth of over 1 MHz, low-temperature superconducting quantum interference devices (SQUIDs) have historically been at the forefront of the field of ultrasensitive magnetic field measurements for nearly half a century [6][7][8]. Although the SQUID technology has reached a sufficient level of maturity and SQUID-based magnetometers are already commercially available, the necessary cryogenics and the ongoing need for costly liquid helium raise their running costs [9,10].…”

Section: Introductionmentioning

confidence: 99%

Fast In-Situ Triaxial Remanent Magnetic Field Measurement for Single-Beam SERF Atomic Magnetometer Based on Trisection Algorithm

et al. 2023

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We demonstrate a method for quickly and automatically detecting all three components of a remanent magnetic field around a shielded spin-exchange relaxation-free (SERF) atomic magnetometer (AM) using the trisection algorithm (TSA) for zero-field resonance (ZFR). To satisfy the measurement of AMs, a resonance light of the 87Rb D1 line with a spectral width of less than 1MHz is converted to circular polarization by a linear polarizer and a quarter-wave plate. After the light beam has passed through the alkali metal vapor cell, the residual magnetic field can be measured by searching for triaxial ZFR optical peaks. The TSA stably reduces the measurement time to 2.41 s on average and improves the measurement accuracy, significantly outpacing existing methods. The weighted averages of all measurements with corresponding uncertainties are (−15.437 ± 0.022)nT, (6.062 ± 0.021)nT, and (−14.158 ± 0.052)nT on the x-, y-, and z-axes, respectively. These improvements could facilitate more extremely weak magnetic studies in real time, such as magnetoencephalography (MEG) and magnetocardiography (MCG) measurements.

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Application of TEM Based on HTS SQUID Magnetometer in Deep Geological Structure Exploration in the Baiyun Gold Deposit, NE China

Cited by 10 publications

References 28 publications

Improving Inversion Quality of IP-Affected TEM Data Using Dual Source

Improving Inversion Quality of IP-Affected TEM Data Using Dual Source

Bayesian inversion and uncertainty analysis of transient electromagnetic data

Fast In-Situ Triaxial Remanent Magnetic Field Measurement for Single-Beam SERF Atomic Magnetometer Based on Trisection Algorithm

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