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The morphology of an active zone near Enceladus’ south pole and implications

Giese, B. und Helfenstein, P. und Thomas, P. C. und Ingersoll, A. P. und Perry, J. und Wagner, R. und Neukum, G. und Porco, C. C. (2010) The morphology of an active zone near Enceladus’ south pole and implications. In: Geophysical Research Abstracts. EGU General Assembly 2010, 02 may - 07 may 2010, Vienna, Austria.

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Offizielle URL: http://meetingorganizer.copernicus.org/EGU2010/poster_programme/2115

Kurzfassung

On Cassini’s 121st orbit, the onboard ISS camera acquired high-resolution (15-30 m/pxl) images in Enceladus’ south polar province. The imaging sequence was specifically designed to study one of the source regions of Enceladus’ erupting plumes, Baghdad Sulcus. To facilitate the analysis, we derived a digital elevation model in an active section (76°S/323°E) across Baghdad Sulcus. The model reveals that there is a V-shaped trough up to 500 m deep in the center of this section, with flanking slopes of 30° (SW-facing) and > 32° (NE-facing, this slope is in shadow). The slopes do approach angle of repose, but the morphology on the SW slope (blocky terrain with lineation patterns and even benches at angles to the maximum slope) suggests that this is not a slope undergoing angle-of-repose control. The trough, therefore, may owe its shape primarily to faulting, with only some modification by deposition of icy particles by the plume-forming gas. Blocky covering, which includes block sizes of up to 50 m, is not restricted to the trough but also occurs at about the same size and frequency distribution away from it. This suggests that the blocks are not related to the venting process, which concentrates in the trough. Rather, the association of the blocky surfaces with multiple patterns of lineations (presumably fractures and faults) suggests they are outcrops of fault-related ice blocks or lithified detritus undergoing some form of erosion. A potential erosion process may include seismic shaking. The V-shaped trough is partly accompanied by an elevated flanking ridge, which is indicative for rift zones and hints at an extensional origin of Baghdad Sulcus. Alternatively, fault-block rotation at large strains could have led to the elevated ridge.

Dokumentart:Konferenzbeitrag (Poster)
Titel:The morphology of an active zone near Enceladus’ south pole and implications
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Giese, B.bernd.giese@dlr.de
Helfenstein, P.Cornell University, Ithaca, NY, USA
Thomas, P. C.Cornell University, Ithaca, NY, USA
Ingersoll, A. P.California Institute of Technology, CA, USA
Perry, J.Planetary Image Research Laboratory, Sonett Space Sciences Building, Tucson, AZ, USA
Wagner, R.roland.wagner@dlr.de
Neukum, G.Inst. für Geologische Wissenschften, Freie Unversität Berlin
Porco, C. C.Space Science Institute, Boulder, CO, USA
Datum:2010
Erschienen in:Geophysical Research Abstracts
Referierte Publikation:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:Enceladus, Saturnian Satellites
Veranstaltungstitel:EGU General Assembly 2010
Veranstaltungsort:Vienna, Austria
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:02 may - 07 may 2010
Veranstalter :European Geosciences Union
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W EW - Erforschung des Weltraums
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W EW - Erforschung des Weltraums
DLR - Teilgebiet (Projekt, Vorhaben):W - Vorhaben CASSINI (alt)
Standort: Berlin-Adlershof
Institute & Einrichtungen:Institut für Planetenforschung > Planetengeodäsie
Hinterlegt von: Dr.rer.nat. Bernd Giese
Hinterlegt am:10 Aug 2010 12:14
Letzte Änderung:10 Aug 2010 12:14

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