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Morphological evidence for geologically young thaw of ice on Mars: A review of recent studies using high-resolution imaging data

Balme, M. and Gallagher, Colman and Hauber, Ernst (2013) Morphological evidence for geologically young thaw of ice on Mars: A review of recent studies using high-resolution imaging data. Progress in Physical Geography, 37 (3), pp. 289-324. SAGE Publications. doi: 10.1177/0309133313477123. ISSN 0309-1333.

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Official URL: http://ppg.sagepub.com/content/37/3/289.abstract


Liquid water is generally only meta-stable on Mars today; it quickly freezes, evaporates or boils in the cold, dry, thin atmosphere (surface pressure is about 200 times lower than on Earth). Nevertheless, there is morphological evidence that surface water was extensive in more ancient times, including the Noachian Epoch (∼4.1 Ga to ∼3.7 Ga bp), when large lakes existed and river-like channel networks were incised, and early in the Hesperian Epoch (∼3.7 Ga to ∼2.9 Ga bp), when megafloods carved enormous channels and smaller fluvial networks developed in association with crater-lakes. However, by the Amazonian Epoch (∼3.0 Ga to present), most surface morphogenesis associated with liquid water had ceased, with long periods of water sequestration as ice in the near-surface and polar regions. However, inferences from observations using imaging data with sub-metre pixel sizes indicate that periglacial landscapes, involving morphogenesis associated with ground-ice and/or surface-ice thaw and liquid flows, has been active within the last few million years. In this paper, three such landform assemblages are described: a high-latitude assemblage comprising features interpreted to be sorted clastic stripes, circles and polygons, non-sorted polygonally patterned ground, fluvial gullies, and solifluction lobes; a mid-latitude assemblage comprising gullies, patterned ground, debris-covered glaciers and hillslope stripes; and an equatorial assemblage of linked basins, patterned ground, possible pingos, and channel-and-scarp features interpreted to be retrogressive thaw-slumps. Hypotheses to explain these observations are explored, including recent climate change, and hydrated minerals in the regolith ‘thawing’ to form liquid brines at very low temperatures. The use of terrestrial analogue field sites is also discussed.

Item URL in elib:https://elib.dlr.de/83963/
Document Type:Article
Title:Morphological evidence for geologically young thaw of ice on Mars: A review of recent studies using high-resolution imaging data
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Balme, M.Open University, Milton Keynes, UKUNSPECIFIEDUNSPECIFIED
Gallagher, ColmanUniv. College Dublin (Ireland)UNSPECIFIEDUNSPECIFIED
Journal or Publication Title:Progress in Physical Geography
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 289-324
Publisher:SAGE Publications
Keywords:Mars, water, ice, thaw, melting, climate
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Exploration of the Solar System
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Geology
Deposited By: Hauber, Ernst
Deposited On:18 Sep 2013 10:40
Last Modified:06 Sep 2019 15:30

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