Induced polarization effects in airborne transient electromagnetic data collected in the McMurdo Dry Valleys, Antarctica

Induced polarization effects in airborne transient electromagnetic data collected in the McMurdo Dry Valleys, Antarctica
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在南极洲麦克默多干谷收集的机载瞬变电磁数据中的感应极化效应

DOI:
10.1093/gji/ggab148
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发表时间:
2021
影响因子:
2.8
通讯作者:
Myers, Krista
Myers, Krista
中科院分区:
地球科学2区
文献类型:
--
作者:
Grombacher, Denys;Auken, Esben;Foged, Nikolaj;Bording, Thue;Foley, Neil;Doran, Peter T;Mikucki, Jill;Dugan, Hilary A;Garza-Giron, Ricardo;Myers, Krista

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航空电磁(EM)是一种非常适合于极地环境中冰川和水文地质构造测绘的地球物理工具。这种非侵入性方法提供了显著的空间覆盖范围,无需进入地面,可以在高度不同的地形上绘制数百米深的地质单元。这种方法显示了在极地环境中进行大规模调查的巨大潜力,因为在这些环境中,永久冻土、冰和富含盐水的地下水系统等共同目标可以很容易地区分,因为它们的电学性质存在显著差异。2011年在麦克默多干谷进行的一项机载电磁调查突出了这一潜力,该调查绘制了泰勒谷大规模区域地下水系统的存在。2018年11月进行了一次更全面的机载电磁调查,以广泛绘制整个地区潜在地下水系统的地图。本次调查中收集的数据显示,一种被称为诱导极化(IP)的过程会产生显著的扰动,这种影响会极大地限制或阻止传统的电磁工作流程产生可靠的地质解释。在这里,我们给出了在一系列条件下观察到的IP特征的几个例子,并详细说明了为处理IP效应而明确设计的工作流程如何能够在这些情况下产生可靠的地质解释和数据。考虑到可能存在的地质物质(如冰和永久冻土)会加剧激电效应的影响,未来的极地电磁调查可能会遇到强烈的激电效应。
Airborne electromagnetics (EM) is a geophysical tool well suited to mapping glacial and hydrogeological structures in polar environments. This non-invasive method offers significant spatial coverage without requiring access to the ground surface, enabling the mapping of geological units to hundreds of metres depth over highly varied terrain. This method shows great potential for large-scale surveys in polar environments, as common targets such as permafrost, ice and brine-rich groundwater systems in these settings can be easily differentiated because of their significant contrasts in electrical properties. This potential was highlighted in a 2011 airborne EM survey in the McMurdo Dry Valleys that mapped the existence of a large-scale regional groundwater system in Taylor Valley. A more comprehensive airborne EM survey was flown in November 2018 to broadly map potential groundwater systems throughout the region. Data collected in this survey displayed significant perturbations from a process called induced polarization (IP), an effect that can greatly limit or prevent traditional EM workflows from producing reliable geological interpretations. Here, we present several examples of observed IP signatures over a range of conditions and detail how workflows explicitly designed to handle IP effects can produce reliable geological interpretations and data fits in these situations. Future polar EM surveys can be expected to encounter strong IP effects given the likely presence of geological materials (e.g. ice and permafrost) that can accentuate the influence of IP.
DOI: 10.1080/08123985.2019.1651618
发表时间: 2020-01
影响因子: 0.9
作者:
N. Foley;S. Tulaczyk;E. Auken;D. Grombacher;J. Mikucki;N. Foged;K. Myers;H. Dugan;P. Doran;R. Virginia
通讯作者: N. Foley;S. Tulaczyk;E. Auken;D. Grombacher;J. Mikucki;N. Foged;K. Myers;H. Dugan;P. Doran;R. Virginia
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DOI: --
发表时间: 2012
期刊: Antarctic Science
影响因子: 1.6
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DOI: --
发表时间: 2013
期刊:
影响因子: --
作者:
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通讯作者: K. Cartwright
DOI: 10.1029/2001jd002045
发表时间: 2002-12-21
影响因子: 4.4
作者:
Doran, PT;McKay, CP;Lyons, WB
通讯作者: Lyons, WB
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DOI: --
发表时间: 2006
期刊:
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作者:
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