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Time will tell; temporal evolution of Martian gullies and palaeoclimatic implications

T. de Haas, Susan J. Conway, F. E. G. Butcher, J. Levy, P. M. Grindrod, T. A. Goudge and M. R. Balme
Time will tell; temporal evolution of Martian gullies and palaeoclimatic implications (in Martian gullies and their Earth analogues, Susan J. Conway (editor), J. L. Carrivick (editor), P. A. Carling (editor), T. de Haas (editor) and Tanya N. Harrison (editor))
Special Publication - Geological Society of London (2019) 467: 165-186


To understand Martian palaeoclimatic conditions and the role of volatiles therein, the spatiotemporal evolution of gullies must be deciphered. While the spatial distribution of gullies has been extensively studied, their temporal evolution is poorly understood. We show that gully size is similar in very young and old craters. Gullies on the walls of very young impact craters (less than a few myr) typically cut into bedrock and are free of latitude-dependent mantle (LDM) and glacial deposits, while such deposits become increasingly evident in older craters. These observations suggest that gullies go through obliquity-driven degradation-accumulation cycles over time, controlled by: (1) LDM emplacement and degradation; and (2) glacial emplacement and removal. In glacially-influenced craters, the distribution of gullies on crater walls coincides with the extent of glacial deposits, which suggests that the melting of snow and ice played a role in the formation of these gullies. Yet, present-day activity is observed in some gullies on formerly glaciated crater walls. Moreover, in very young craters, extensive gullies have formed in the absence of LDM and glacial deposits, showing that gully formation can also be unrelated to these deposits. The Martian climate varied substantially over time, and the gully-forming mechanisms are likely to have varied accordingly.

ISSN: 0305-8719
Serial Title: Special Publication - Geological Society of London
Serial Volume: 467
Title: Time will tell; temporal evolution of Martian gullies and palaeoclimatic implications
Title: Martian gullies and their Earth analogues
Author(s): de Haas, T.Conway, Susan J.Butcher, F. E. G.Levy, J.Grindrod, P. M.Goudge, T. A.Balme, M. R.
Author(s): Conway, Susan J.editor
Author(s): Carrivick, J. L.editor
Author(s): Carling, P. A.editor
Author(s): de Haas, T.editor
Author(s): Harrison, Tanya N.editor
Affiliation: Universiteit Utrecht, Faculty of Geosciences, Utrecht, Netherlands
Pages: 165-186
Published: 2019
Text Language: English
Publisher: Geological Society of London, London, United Kingdom
References: 86
Accession Number: 2019-032143
Categories: Extraterrestrial geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables
Secondary Affiliation: Universite de Nantes, FRA, FranceOpen University, GBR, United KingdomUniversity of Texas at Austin, USA, United StatesUniversity of London, GBR, United Kingdom
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 201908
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