Ceres' Ezinu quadrangle: a heavily cratered region with evidence for localized subsurface water ice and the context of Occator crater

被引：23

作者：

Scully, Jennifer E. C. ^{[1
]}

Buczkowski, D. L. ^{[2
]}

Neesemann, A. ^{[3
]}

Williams, D. A. ^{[4
]}

Mest, S. C. ^{[5
]}

Raymond, C. A. ^{[1
]}

Nass, A. ^{[6
]}

Hughson, K. H. G. ^{[7
]}

Kneissl, T. ^{[3
]}

Pasckert, J. H. ^{[8
]}

Ruesch, O. ^{[9
]}

Frigeri, A. ^{[10
]}

Marchi, S. ^{[11
]}

Combe, J-P. ^{[12
]}

Schmedemann, N. ^{[3
]}

Schmidt, B. E. ^{[13
]}

Chilton, H. T. ^{[13
]}

Russell, C. T. ^{[7
]}

Jaumann, R. ^{[6
]}

Preusker, F. ^{[6
]}

Roatsch, T. ^{[6
]}

Hoffmann, M. ^{[14
]}

Nathues, A.

Schaefer, M. ^{[6
]}

Ermakov, A. I. ^{[1
]}

机构：

[1] CALTECH, Jet Prop Lab, 4800 Oak Grove Dr, Pasadena, CA 91109 USA

[2] Johns Hopkins Univ, Appl Phys Lab, Johns Hopkins Rd, Laurel, MD 20723 USA

[3] Free Univ Berlin, D-14195 Berlin, Germany

[4] Arizona State Univ, Tempe, AZ 85004 USA

[5] Planetary Sci Inst, Tucson, AZ 85719 USA

[6] German Aerosp Ctr DLR, D-12489 Berlin, Germany

[7] Univ Calif Los Angeles, Los Angeles, CA 90095 USA

[8] Univ Munster, D-48149 Munster, Germany

[9] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

[10] Natl Inst Astrophys INAF IFSI, Inst Space Astrophys & Planetol, I-00133 Rome, Italy

[11] Southwest Res Inst, Boulder, CO USA

[12] Bear Fight Inst, Winthrop, WA 98862 USA

[13] Georgia Inst Technol, Atlanta, GA 30332 USA

[14] Max Planck Inst Solar Syst Res, D-37007 Gottingen, Germany

来源：

ICARUS | 2018年 / 316卷

基金：

美国国家航空航天局;

关键词：

Asteroid Ceres; Asteroids; surfaces; Geological processes; Ices; Impact processes; GEOMORPHOLOGICAL EVIDENCE; SURFACE-COMPOSITION; EMPLACEMENT; FEATURES; FOSSAE; VESTA;

D O I：

10.1016/j.icarus.2017.10.038

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Dawn is the first spacecraft to visit and orbit Ceres, the largest object in the asteroid belt and the only dwarf planet in the inner Solar System. The Dawn science team undertook a systematic geologic mapping campaign of Ceres' entire surface. Here we present our contribution to this mapping campaign, a geologic map and geologic history of the Ezinu quadrangle, located in the northern mid latitudes from 21-66 degrees N and 180-270 degrees E. From our map, we reconstruct the geologic history of Ezinu quadrangle, which is dominated by impact cratering. Large impact craters that formed a few hundreds to tens of millions of years ago, such as Datan, Messor, Ninsar and Occator, are surrounded by ejecta and contain the products of mass wasting (hummocky crater floor material and talus material) and crater-wall collapse (terrace material). Two of these large impact craters are the sources of lobate flows, which we interpret as melt flows emplaced after the ballistically deposited ejecta. Morphological evidence suggests these lobate flows are rich in water-ice-bearing material that was excavated during the formation of the impact craters. There are only a few localized occurrences of lobate flows, suggesting that the water-ice-bearing source materials have restricted extents and/or are deeply buried within Ceres' subsurface. The quadrangle also contains a variety of linear features: secondary crater chains are formed by the impact of locally and globally sourced material and pit chains and grooves are formed by the collapse of surficial materials into sub-surface fractures. The Ezinu quadrangle contains the northern portion of Occator crater, which is the host crater of prominent bright regions called faculae. Our geologic analysis therefore also provides context for the future investigation of Occator and its intriguing faculae. (C) 2017 Elsevier Inc. All rights reserved.

引用

页码：46 / 62

页数：17

共 2 条

[1] Evidence for subsurface water ice in Korolev crater, Mars
Armstrong, JC
Titus, TN
Kieffer, HH
ICARUS, 2005, 174 (02) : 360 - 372
[2] Ring-Mold Craters on Ceres: Evidence for Shallow Subsurface Water Ice Sources
Krohn, K.
Neesemann, A.
Jaumann, R.
Otto, K. A.
Stephan, K.
Wagner, R. J.
Tosi, F.
Zambon, F.
Ruesch, O.
Williams, D. A.
Raymond, C. A.
Russell, C. T.
GEOPHYSICAL RESEARCH LETTERS, 2018, 45 (16) : 8121 - 8128

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