DOI: 10.1002/grl.50506
论文题名: Does folding accommodate Europa's contractional strain? The effect of surface temperature on fold formation in ice lithospheres
作者: Bland M.T. ; McKinnon W.B.
刊名: Geophysical Research Letters
ISSN: 0094-8953
EISSN: 1944-8684
出版年: 2013
卷: 40, 期: 11 起始页码: 2534
结束页码: 2538
语种: 英语
英文关键词: contraction
; Europa
; folding
; strain
; surface temperature
Scopus关键词: Cold temperatures
; Europa
; folding
; Plausible mechanisms
; Polar latitude
; Strain accommodations
; Surface temperatures
; Warm temperatures
; Atmospheric temperature
; Relativity
; Shrinkage
; Strain
; Surface properties
; contraction
; folding
; Galileo mission
; lithosphere
; polar region
; radiometer
; strain rate
; structural geology
; surface temperature
; Europe
英文摘要: On Europa, the mechanism by which contractional strains are accommodated remains a mystery. Subtle folds have been observed in the polar regions, but if folding is a dominant accommodation mechanism, ubiquitous large-amplitude folds might be expected across Europa's surface. Here we use finite element modeling to show that fold growth rates are a strong function of surface temperature: warm temperatures result in lower rates, whereas cold temperatures result in higher rates. Combining diurnally averaged Europan surface temperatures derived from Galileo photopolarimeter-radiometer data and new numerical simulations, we show that forming moderate-amplitude folds requires roughly twice the contraction, or shortening, in Europa's equatorial latitudes relative to polar latitudes. Relatively large contractional strains in Europa's equatorial and midlatitudes can therefore be accommodated primarily through passive shortening without producing obvious folds. Lithospheric folding and/or passive shortening therefore remain plausible mechanisms for strain accommodation on Europa. ©2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84879938920&doi=10.1002%2fgrl.50506&partnerID=40&md5=33146e5ded226f1393317300f45afc72
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6217
Appears in Collections: 气候减缓与适应
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作者单位: Department of Earth and Planetary Sciences, McDonnell Center for the Space Sciences, Washington University in St. Louis, 1 Brookings Dr., Saint Louis, MO 63130, United States
Recommended Citation:
Bland M.T.,McKinnon W.B.. Does folding accommodate Europa's contractional strain? The effect of surface temperature on fold formation in ice lithospheres[J]. Geophysical Research Letters,2013-01-01,40(11).