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Crater-related flow features on Ceres - Implications for cryovolcanism

Krohn, Katrin and Jaumann, R. and Stephan, Katrin and Otto, Katharina and Schmedemann, N. and Wagner, Roland and Matz, Klaus-Dieter and Tosi, F. and Zambon, F. and von der Gathen, Isabel and Schulzeck, Franziska and Buczkowski, D.L. and Hiesinger, H. and McSween, H.Y. and Pieters, C.M. and Preusker, Frank and Roatsch, Thomas and Raymond, C.A. and Russell, C.T. and Williams, D.A. (2016) Crater-related flow features on Ceres - Implications for cryovolcanism. AGU, 12.-16. Dez. 2016, San Francisco, CA, USA.

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Official URL: https://agu.confex.com/agu/fm16/meetingapp.cgi/Paper/146842

Abstract

Some craters on Ceres show post-impact modifications, like the deposition of extended plains laced with pits, lobate flows, and ponded material [1]. We found those features on craters with a bluish spectral signature, such as Haulani, Ikapati, Occator and Kupalo. Lobate flows of Haulani and Kupalo originating from the crest of the central ridge [1,2] partly overwhelming the mass wasting deposits from the rim, indicating possible post-impact resurfacing processes [3,4]. The drop height-to-runout length ratio of several flow features of the four craters reveals a coefficient of friction of < 0.1, implying higher flow efficiency for flows on Ceres than for similar features on other planetary bodies with similar gravity [1]. Therefore, we suggest a ductile material for the formation of those flows. Furthermore, the suggestion of an occurrence of ice within the Cerean crust [5] as well as possible salts incorporated into a regolith layer [3,4,5] indicates similar geological processes as seen on other icy bodies. Latest results by the Dawn Spacecraft indicates that Ceres is a weakly differentiated body containing a shell dominated by an ice-rock mixture [6] and ammoniated phyllosilicates [7]. Recent observations also show that hydrated salts could be warm enough to be mobile at a depth of 1.5-5 km below Ceres´ surface and would explain the buoyancy of ice and salt-enriched crustal reservoirs [8]. Therefore, it is likely that impacts hitting such reservoir layers triggered mobility and could have formed cryovolcanic features. Moreover, we assume that the plains and flow materials also originate from the subsurface and their release is triggered by impacts [3]. Additionally, the bluish material is mainly associated with the youngest impact craters on Ceres [9]. Thus, the post-impact modifications of the observed craters are formed by one of the youngest geologic processes on Ceres.

Item URL in elib:https://elib.dlr.de/108679/
Document Type:Conference or Workshop Item (Speech)
Title:Crater-related flow features on Ceres - Implications for cryovolcanism
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Krohn, Katrinkatrin.krohn (at) dlr.deUNSPECIFIED
Jaumann, R.ralf.jaumann (at) dlr.deUNSPECIFIED
Stephan, KatrinKatrin.Stephan (at) dlr.deUNSPECIFIED
Otto, KatharinaKatharina.Otto (at) dlr.deUNSPECIFIED
Schmedemann, N.freie universitaet berlin, inst. of geosciences, planetology and remote sensing, malteserstr. 74, 12249 berlin, germanyUNSPECIFIED
Wagner, RolandRoland.Wagner (at) dlr.deUNSPECIFIED
Matz, Klaus-Dieterklaus-dieter.matz (at) dlr.deUNSPECIFIED
Tosi, F.inaf-iasf istituto di astrofisica spaziale e fisica cosmica, roma italyUNSPECIFIED
Zambon, F.inaf-iaps, via del fosso del cavaliere 100, i-00133 rome, italyUNSPECIFIED
von der Gathen, IsabelIsabel.Gathen (at) dlr.deUNSPECIFIED
Schulzeck, FranziskaFranziska.Schulzeck (at) dlr.deUNSPECIFIED
Buczkowski, D.L.johns hopkins university applied physics laboratory 11100 johns hopkins rd. laurel, md 20723-6099, usaUNSPECIFIED
Hiesinger, H.westfälische wilhelms-universität münsterUNSPECIFIED
McSween, H.Y.university of tennessee, knoxville, tn, usaUNSPECIFIED
Pieters, C.M.brown university, providence, ri, usaUNSPECIFIED
Preusker, Frankfrank.preusker (at) dlr.deUNSPECIFIED
Roatsch, ThomasThomas.Roatsch (at) dlr.deUNSPECIFIED
Raymond, C.A.jet propulsion laboratory, california institute of technology, pasadena, ca 91109-8099, usaUNSPECIFIED
Russell, C.T.institute of geophysics, university of california, los angeles, los angeles, ca 90095UNSPECIFIED
Williams, D.A.arizona state universityUNSPECIFIED
Date:2016
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:P41C-04
Status:Published
Keywords:Ceres, cryovolcanism, flow features
Event Title:AGU
Event Location:San Francisco, CA, USA
Event Type:international Conference
Event Dates:12.-16. Dez. 2016
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Projekt DAWN
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Geology
Institute of Planetary Research > Planetary Geodesy
Deposited By: Krohn, Dr.rer.nat Katrin
Deposited On:15 Dec 2016 08:03
Last Modified:15 Dec 2016 08:03

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