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Evidence for very recent melt-water and debris flow activity in gullies in a young mid-latitude crater on Mars

Johnsson, Andreas and Reiss, Dennis and Hauber, Ernst and Hiesinger, H. and Zanetti, M. (2014) Evidence for very recent melt-water and debris flow activity in gullies in a young mid-latitude crater on Mars. Icarus, 235, pp. 37-54. Elsevier. DOI: 10.1016/j.icarus.2014.03.005 ISSN 0019-1035

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Official URL: http://www.sciencedirect.com/science/article/pii/S0019103514001225

Abstract

Terrestrial debris flows and their deposits are mainly studied and monitored because of their hazardous nature. On Mars they may serve as geomorphologic indicators of transient liquid water. We compared the morphology of debris flow-like deposits within a young (�0.2 Ma) mid-latitude crater on Mars with debris flow fans on Svalbard as possible terrestrial analogues. It was our objective to constrain whether dry granular flow or processes related to water-saturation at or close to the surface were responsible for the formation of the deposits within the crater.We found that the morphological attributes of the deposits on Mars are very similar to debris flows in Svalbard and include overlapping terminal lobes, debris tongues and snouts, debris-flow fans, scoured channels with medial deposits (debris plugs), and clearly defined lateral deposits (levées). Furthermore, the interior crater walls display a range of landforms indicating aspect-dependent degradation, ranging from debris flow-dominated pole-facing slopes, to east-andwest- facing single channel gullies and north-facing talus cones (granular flow). Our findings suggest that the debris flows are not related to impact-induced heating and release of meltwater. We further suggest that degradation of a latitude dependent dust–ice mantling unit may only have played a minor role in this youthful terrain. Instead, we propose that the debris flows are mainly formed by melting of very recent snow deposits after the termination of the last martian ice-age. As such they may represent some of the most recent geomorphological indicators of transient liquid water in the martian mid-latitudes. The distinct north–south asymmetry in degradation further demonstrates that insolation-controlled slope processes are surprisingly efficient on Mars during the last <1 Myr.

Item URL in elib:https://elib.dlr.de/91907/
Document Type:Article
Title:Evidence for very recent melt-water and debris flow activity in gullies in a young mid-latitude crater on Mars
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Johnsson, AndreasUniversity of GothenburgUNSPECIFIED
Reiss, DennisInstitut für Planetologie, Westfälische Wilhelms‐Universität Münster, Münster, GermanyUNSPECIFIED
Hauber, ErnstUNSPECIFIEDUNSPECIFIED
Hiesinger, H.Westfälische Wilhelms-Universität MünsterUNSPECIFIED
Zanetti, M.Department of Earth and Planetary Sciences, Washington University in St. Louis, USA.UNSPECIFIED
Date:2014
Journal or Publication Title:Icarus
Refereed publication:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:235
DOI :10.1016/j.icarus.2014.03.005
Page Range:pp. 37-54
Publisher:Elsevier
ISSN:0019-1035
Status:Published
Keywords:Mars, permafrost, cryosphere, water, ice, climate, gullies, debris flows, Svalbard, Spitzbergen
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 MARS-EXPRESS / HRSC
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Geology
Deposited By: Hauber, Ernst
Deposited On:19 Nov 2014 09:03
Last Modified:10 Jan 2019 15:54

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