Directional Dependence of Magnetization and Coercivity in Hematite Ore Experimentally Deformed in Torsion

IF 3.9 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS
Eduard Petrovský, Matěj Machek, Ramon Egli, Vladimír Kusbach, Zuzana Roxerová, Erik Rybacki
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引用次数: 0

Abstract

Rock-magnetic properties are widely used to resolve the composition, concentration, size, shape, and alignment of iron oxides in rock samples. Although anisotropy of magnetic susceptibility is measured routinely, acquisition of remanent magnetization as well as hysteresis loops are usually measured in one direction only. This may lead to biased interpretation of the results. In our study, observation of strong directional dependence of remanence acquisition curves and hysteresis loops in experimentally deformed samples of hematite ore is reported. While the original undeformed hematite ore sample exhibited magnetic properties practically independent of the direction, the specimens which experienced deformation in torsion showed significant anisotropy. For example, the anisotropy of saturation magnetization reached several tens of percent. Our results suggest that experimental deformation resulted in neoformation of magnetite nanoparticles, as well as shift of the original hematite coercivity spectra toward lower values. These findings have significant impact on the remanent and induced magnetization measurement protocols and interpretation of the data. Anisotropy of these parameters should be checked at least in cases when hematite is assumed to be present in the samples, or the samples underwent creep deformation.

Abstract Image

赤铁矿磁化强度和矫顽力的方向依赖性
岩石磁性能被广泛用于分析岩石样品中氧化铁的组成、浓度、大小、形状和排列。虽然磁化率的各向异性是常规测量,但剩余磁化率和磁滞回线的采集通常只在一个方向上测量。这可能导致对结果的有偏见的解释。在我们的研究中,报告了在实验变形的赤铁矿样品中观察到的剩余物采集曲线和磁滞回线的强方向依赖性。原始未变形赤铁矿样品的磁性能几乎与方向无关,而经过扭转变形的赤铁矿样品则表现出明显的各向异性。例如,饱和磁化的各向异性达到了几十个百分点。实验结果表明,实验变形导致了磁铁矿纳米颗粒的新形成,并使原始赤铁矿的矫顽力谱向更低的值移动。这些发现对剩余磁化和感应磁化的测量方案和数据解释具有重要影响。至少在假设样品中存在赤铁矿或样品经历蠕变时,应检查这些参数的各向异性。
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来源期刊
Journal of Geophysical Research: Solid Earth
Journal of Geophysical Research: Solid Earth Earth and Planetary Sciences-Geophysics
CiteScore
7.50
自引率
15.40%
发文量
559
期刊介绍: The Journal of Geophysical Research: Solid Earth serves as the premier publication for the breadth of solid Earth geophysics including (in alphabetical order): electromagnetic methods; exploration geophysics; geodesy and gravity; geodynamics, rheology, and plate kinematics; geomagnetism and paleomagnetism; hydrogeophysics; Instruments, techniques, and models; solid Earth interactions with the cryosphere, atmosphere, oceans, and climate; marine geology and geophysics; natural and anthropogenic hazards; near surface geophysics; petrology, geochemistry, and mineralogy; planet Earth physics and chemistry; rock mechanics and deformation; seismology; tectonophysics; and volcanology. JGR: Solid Earth has long distinguished itself as the venue for publication of Research Articles backed solidly by data and as well as presenting theoretical and numerical developments with broad applications. Research Articles published in JGR: Solid Earth have had long-term impacts in their fields. JGR: Solid Earth provides a venue for special issues and special themes based on conferences, workshops, and community initiatives. JGR: Solid Earth also publishes Commentaries on research and emerging trends in the field; these are commissioned by the editors, and suggestion are welcome.
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