气候变化领域集成服务门户(CCPortal): Pseudotachylyte Alteration and the Rapid Fade of Earthquake Scars From the Geological Record

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DOI	10.1029/2020GL090020
	Pseudotachylyte Alteration and the Rapid Fade of Earthquake Scars From the Geological Record
	Fondriest M.; Mecklenburgh J.; Passelegue F.X.; Artioli G.; Nestola F.; Spagnuolo E.; Rempe M.; Di Toro G.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:22
英文摘要	Tectonic pseudotachylytes are solidified frictional melts produced on faults during earthquakes and are robust markers of seismic slip events. Nonetheless, pseudotachylytes are apparently uncommon fault rocks, because they are either rarely produced or are easily lost from the geological record. To solve this conundrum, long-lasting (18–35 days) hydrothermal alteration tests were performed on fresh pseudotachylytes produced by sliding solid rock samples at seismic slip rates in the laboratory. After all tests, the pseudotachylytes were heavily altered with dissolution of the matrix and neo-formation of clay aggregates. Post-alteration products closely resemble natural altered pseudotachylytes and associated ultracataclasites (i.e., fault rocks affected by fracturing in the absence of melting), demonstrating that the preservation potential of original pseudotachylyte microstructures is very short, days to months, in the presence of hydrothermal fluids. As a consequence, pseudotachylytes might be significantly underrepresented in the geological record, and on-fault frictional melting during earthquakes is likely to occur more commonly than generally believed. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Clay alteration; Earthquakes; Friction; Melting; Clay aggregates; Frictional melting; Frictional melts; Hydrothermal alterations; Hydrothermal fluids; Preservation potential; Pseudotachylytes; Robust markers; Fault slips; clay soil; fault plane; hydrothermal alteration; matrix; preservation; pseudotachylite; seismic response; sliding; slip; soil aggregate; tectonic structure
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169439
作者单位	Department of Earth and Environmental Sciences (DEES), University of Manchester, Manchester, United Kingdom; Dipartimento di Geoscienze, Università degli Studi di Padova, Padova, Italy; Now at Institut des Sciences de la Terre (ISTerre), Université Grenoble Alpes, Grenoble, France; École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland; Istituto Nazionale di Geofisica e Vulcanologia (INGV), Rome, Italy; Institut für Geologie, Mineralogie und Geophysik, Ruhr-Universität Bochum, Bochum, Germany
推荐引用方式 GB/T 7714	Fondriest M.,Mecklenburgh J.,Passelegue F.X.,et al. Pseudotachylyte Alteration and the Rapid Fade of Earthquake Scars From the Geological Record[J],2020,47(22).
APA	Fondriest M..,Mecklenburgh J..,Passelegue F.X..,Artioli G..,Nestola F..,...&Di Toro G..(2020).Pseudotachylyte Alteration and the Rapid Fade of Earthquake Scars From the Geological Record.Geophysical Research Letters,47(22).
MLA	Fondriest M.,et al."Pseudotachylyte Alteration and the Rapid Fade of Earthquake Scars From the Geological Record".Geophysical Research Letters 47.22(2020).