Geomorphological evidence for ground ice on dwarf planet Ceres

被引：0

作者：

Schmidt B.E. ^{[1
]}

Hughson K.H.G. ^{[2
]}

Chilton H.T. ^{[1
]}

Scully J.E.C. ^{[3
]}

Platz T. ^{[4
]}

Nathues A. ^{[4
]}

Sizemore H. ^{[5
]}

Bland M.T. ^{[6
]}

Byrne S. ^{[7
]}

Marchi S. ^{[8
]}

O'Brien D.P. ^{[5
]}

Schorghofer N. ^{[9
]}

Hiesinger H. ^{[10
]}

Jaumann R. ^{[11
]}

Pasckert J.H. ^{[10
]}

Lawrence J.D. ^{[1
]}

Buzckowski D. ^{[12
]}

Castillo-Rogez J.C. ^{[3
]}

Sykes M.V. ^{[5
]}

Schenk P.M. ^{[13
]}

Desanctis M.-C. ^{[14
]}

Mitri G. ^{[15
]}

Formisano M. ^{[14
]}

Li J.-Y. ^{[5
]}

Reddy V. ^{[5
]}

LeCorre L. ^{[5
]}

Russell C.T. ^{[2
]}

Raymond C.A. ^{[3
]}

机构：

[1] Georgia Institute of Technology, Atlanta, 30332, GA

[2] University of California at Los Angeles, Los Angeles, 90095-1567, CA

[3] Jet Propulsion Laboratory, California Institute of Technology, Pasadena, 91109, CA

[4] Max-Planck Institut Für Sonnensystemforschung, Gttingen

[5] Planetary Science Institute, Tucson, 85719-2395, AZ

[6] United States Geological Survey, Flagstaff, 86001, AZ

[7] University of Arizona, Tucson, 85721-0092, AZ

[8] Southwest Research Institute, Boulder, 80302, CO

[9] University of Hawaii at Manoa, Honolulu, 96822, HI

[10] Institut Für Planetologie, Westfälische Wilhelms-Universität, Münster

[11] German Aerospace Center (DLR), Berlin

[12] Applied Physics Laboratory, Johns Hopkins University, Laurel, 20723, MD

[13] Lunar and Planetary Institute, Houston, 77048, TX

[14] Istituto di Astrofisica e Planetologia Spaziali, INAF, Roma

[15] Universite de Nantes, Nantes

来源：

Nature Geoscience | 2017年 / 10卷 / 5期

关键词：

D O I：

10.1038/ngeo2936

中图分类号：

学科分类号：

摘要：

Five decades of observations of Ceres suggest that the dwarf planet has a composition similar to carbonaceous meteorites and may have an ice-rich outer shell protected by a silicate layer. NASA's Dawn spacecraft has detected ubiquitous clays, carbonates and other products of aqueous alteration across the surface of Ceres, but surprisingly it has directly observed water ice in only a few areas. Here we use Dawn Framing Camera observations to analyse lobate morphologies on Ceres' surface and we infer the presence of ice in the upper few kilometres of Ceres. We identify three distinct lobate morphologies that we interpret as surface flows: thick tongue-shaped, furrowed flows on steep slopes; thin, spatulate flows on shallow slopes; and cuspate sheeted flows that appear fluidized. The shapes and aspect ratios of these flows are different from those of dry landslides - including those on ice-poor Vesta - but are morphologically similar to ice-rich flows on other bodies, indicating the involvement of ice. Based on the geomorphology and poleward increase in prevalence of these flows, we suggest that the shallow subsurface of Ceres is comprised of mixtures of silicates and ice, and that ice is most abundant near the poles. © 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved.

引用

页码：338 / 343

页数：5

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