气候变化领域集成服务门户(CCPortal): A Very Young Age for True Polar Wander on Europa From Related Fracturing

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DOI	10.1029/2020GL088364
	A Very Young Age for True Polar Wander on Europa From Related Fracturing
	Schenk P.; Matsuyama I.; Nimmo F.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:17
英文摘要	En echelon fissures 100–300 km long on Europa are found to be concentric and external to arcuate troughs previously attributed to true polar wander (TPW) of Europa's ice shell, strengthening the case for TPW. Fissures are composed of parallel faults distributed over 10-to-20-km-wide zones, with deformation focused in a main fissure 1–2 km wide and up to 200 m deep. Fissures crosscut all known terrains, including (apparently) ejecta of bright ray crater Manannan, establishing that fissures and by inference TPW are among the most recent geologic events on Europa. Very late ~70° of TPW shell rotation requires that most observed structures on Europa are not in their original configuration with respect to other stress regimes, requiring complete reanalysis of Europa's strain history. If reorientation happened recently, we predict that any crater distribution asymmetries and shell thickness variations measured by Europa Clipper will be offset from expected equilibrium patterns. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Earth sciences; Geophysics; Crater distribution; Ice shells; Reanalysis; Shell thickness; Stress regime; True Polar Wander; Geomagnetism; asymmetry; crater; deformation; en echelon structure; fault plane; fissure; polar wandering; rotation; trough
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/169815
作者单位	Lunar and Planetary Institute, Universities Space Research Association, Houston, TX, United States; Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, United States; Department of Earth and Planetary Sciences, University of California, Santa Cruz, CA, United States
推荐引用方式 GB/T 7714	Schenk P.,Matsuyama I.,Nimmo F.. A Very Young Age for True Polar Wander on Europa From Related Fracturing[J],2020,47(17).
APA	Schenk P.,Matsuyama I.,&Nimmo F..(2020).A Very Young Age for True Polar Wander on Europa From Related Fracturing.Geophysical Research Letters,47(17).
MLA	Schenk P.,et al."A Very Young Age for True Polar Wander on Europa From Related Fracturing".Geophysical Research Letters 47.17(2020).