断裂岩磁性揭示断裂过程

IF 25.2 1区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS
Tao Yang, Yu-Min Chou, Eric C. Ferré, Mark J. Dekkers, Jianye Chen, En-Chao Yeh, Wataru Tanikawa
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引用次数: 13

摘要

由于含铁矿物——尤其是铁磁性矿物——对应力、温度和断裂带中流体的存在很敏感,它们的磁性能为研究影响断裂带岩石的物理和化学过程提供有价值的见解。本文综述了近三十年来断层岩磁学研究的进展。我们提供了一个综合的机制,说明在断层岩石的磁性变化和见解从磁性研究中获得。我们也整合了非磁性方法来评价断层岩石的磁性。磁分析揭示了在断裂带中运行的微观过程,如摩擦加热、能量耗散和流体渗透,否则很难约束。这使得磁特性适合作为断层带的“应变指示器”、“地温计”和“流体示踪剂”。然而,对断层诱发的地磁变化尚未完全了解。未来的研究应集中在对断裂带进行详细的磁性分析,包括磁微扫描和磁结构分析。为了校准对自然断层带的观测,必须进行实验室实验,以便能够提取导致某种磁特征的确切物理化学条件。潜在的途径可能包括:(1)摩擦实验后对天然和合成断层岩石的磁调查,(2)断层流体渗流的实验室模拟,(3)与断裂过程相关的运动学后剩余物成分的古磁学分析,以及(4)矿物磁学研究中跨学科方法的协同。这将有助于把我们对断层的微观物理学的理解放在一个更牢固的基础上。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Faulting Processes Unveiled by Magnetic Properties of Fault Rocks

As iron-bearing minerals—ferrimagnetic minerals in particular—are sensitive to stress, temperature, and presence of fluids in fault zones, their magnetic properties provide valuable insights into physical and chemical processes affecting fault rocks. Here, we review the advances made in magnetic studies of fault rocks in the past three decades. We provide a synthesis of the mechanisms that account for the magnetic changes in fault rocks and insights gained from magnetic research. We also integrate nonmagnetic approaches in the evaluation of the magnetic properties of fault rocks. Magnetic analysis unveils microscopic processes operating in the fault zones such as frictional heating, energy dissipation, and fluid percolation that are otherwise difficult to constrain. This makes magnetic properties suited as a “strain indicator,” a “geothermometer,” and a “fluid tracer” in fault zones. However, a full understanding of faulting-induced magnetic changes has not been accomplished yet. Future research should focus on detailed magnetic property analysis of fault zones including magnetic microscanning and magnetic fabric analysis. To calibrate the observations on natural fault zones, laboratory experiments should be carried out that enable to extract the exact physicochemical conditions that led to a certain magnetic signature. Potential avenues could include (1) magnetic investigations on natural and synthetic fault rocks after friction experiments, (2) laboratory simulation of fault fluid percolation, (3) paleomagnetic analysis of postkinematic remanence components associated with faulting processes, and (4) synergy of interdisciplinary approaches in mineral-magnetic studies. This would help to place our understanding of the microphysics of faulting on a much stronger footing.

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来源期刊
Reviews of Geophysics
Reviews of Geophysics 地学-地球化学与地球物理
CiteScore
50.30
自引率
0.80%
发文量
28
审稿时长
12 months
期刊介绍: Geophysics Reviews (ROG) offers comprehensive overviews and syntheses of current research across various domains of the Earth and space sciences. Our goal is to present accessible and engaging reviews that cater to the diverse AGU community. While authorship is typically by invitation, we warmly encourage readers and potential authors to share their suggestions with our editors.
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