Landslides on Ceres: Diversity and Geologic Context.

Autor: Duarte KD; School of Earth and Atmospheric Sciences Georgia Institute of Technology Atlanta GA USA., Schmidt BE; School of Earth and Atmospheric Sciences Georgia Institute of Technology Atlanta GA USA., Chilton HT; School of Earth and Atmospheric Sciences Georgia Institute of Technology Atlanta GA USA., Hughson KHG; School of Earth and Atmospheric Sciences Georgia Institute of Technology Atlanta GA USA.; Institute of Geophysics and Planetary Physics University of California Los Angeles CA USA., Sizemore HG; Planetary Science Institute Tucson AZ USA., Ferrier KL; School of Earth and Atmospheric Sciences Georgia Institute of Technology Atlanta GA USA., Buffo JJ; School of Earth and Atmospheric Sciences Georgia Institute of Technology Atlanta GA USA., Scully JEC; Jet Propulsion Laboratory California Institute of Technology Pasadena CA USA., Nathues A; Max-Planck Institute for Solar System Research Katlenburg-Lindau Germany., Platz T; Max-Planck Institute for Solar System Research Katlenburg-Lindau Germany., Landis M; Lunar and Planetary Laboratory University of Arizona Tucson AZ USA.; USGS Flagstaff AZ USA., Byrne S; Lunar and Planetary Laboratory University of Arizona Tucson AZ USA., Bland M; Now at Boulder Laboratory for Atmospheric and Space Physics University of Colorado Boulder Boulder CO USA., Russell CT; Institute of Geophysics and Planetary Physics University of California Los Angeles CA USA., Raymond CA; Jet Propulsion Laboratory California Institute of Technology Pasadena CA USA.
Jazyk: angličtina
Zdroj: Journal of geophysical research. Planets [J Geophys Res Planets] 2019 Dec; Vol. 124 (12), pp. 3329-3343. Date of Electronic Publication: 2019 Dec 17.
DOI: 10.1029/2018JE005673
Abstrakt: Landslides are among the most widespread geologic features on Ceres. Using data from Dawn's Framing Camera, landslides were previously classified based upon geomorphologic characteristics into one of three archetypal categories, Type 1(T1), Type 2 (T2), and Type 3 (T3). Due to their geologic context, variation in age, and physical characteristics, most landslides on Ceres are, however, intermediate in their morphology and physical properties between the archetypes of each landslide class. Here we describe the varied morphology of individual intermediate landslides, identify geologic controls that contribute to this variation, and provide first-order quantification of the physical properties of the continuum of Ceres's surface flows. These intermediate flows appear in varied settings and show a range of characteristics, including those found at contacts between craters, those having multiple trunks or lobes; showing characteristics of both T2 and T3 landslides; material slumping on crater rims; very small, ejecta-like flows; and those appearing inside of catenae. We suggest that while their morphologies can vary, the distribution and mechanical properties of intermediate landslides do not differ significantly from that of archetypal landslides, confirming a link between landslides and subsurface ice. We also find that most intermediate landslides are similar to Type 2 landslides and formed by shallow failure. Clusters of these features suggest ice enhancement near Juling, Kupalo and Urvara craters. Since the majority of Ceres's landslides fall in the intermediate landslide category, placing their attributes in context contributes to a better understanding of Ceres's shallow subsurface and the nature of ground ice.
(©2019. American Geophysical Union. All Rights Reserved.)
Databáze: MEDLINE
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