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Polygonated soils in the hyper-arid Atacama Desert and their relevance for patterned ground on Mars

Sager, Christof und Airo, A. und Arens, Felix und Baque, Mickael und de Vera, Jean Pierre Paul und Schulze-Makuch, D. (2018) Polygonated soils in the hyper-arid Atacama Desert and their relevance for patterned ground on Mars. 3rd Astrobiology Graduates in Europe (AbGradE) symposium, 22-24 September 2018, Berlin, Germany.

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Kurzfassung

Patterned grounds represent widespread and yet puzzling landscape features on Mars and periglacial regions on Earth and are believed to form through the repetitive deformation of the ground. A better knowledge of their distribution, morphological variability, and processes of formation can give clues about past and recent climatic conditions, the composition of the ground and presence of ground ice/water, which is critical for the search for life on Mars. The formation of patterned grounds in periglacial regions on Earth is based on the process of frost heave, where repeated freeze-thawing of water leads to the deformation of the ground (cryoturbation). On today’s Mars, the climatic conditions are not favorable for extensive freeze-thawing processes. However, vast quantities of ground ice enable frost heave processes through dry-cryoturbation. In addition, thermoturbation processes in ice-cemented soils are also assumed to be responsible for polygonated ground formation. Thereby, temperature di!erences lead to extensional and compressional forces in the salt cemented soil and can thus facilitate cracking and turbation processes. Patterned grounds are also observed in the hyper-arid Atacama Desert where cryoturbation can be excluded due to the high temperatures and thus polygonated soils do not necessarily indicate ground water. These features are assumed to have formed by a combination of thermoturbation and haloturbation where repeated precipitation and dissolution of salts deform the ground. Hence, in addition to periglacial processes (frost heave), patterned ground formation processes in hot hyper-arid regions (salt heave) should be considered for Mars as well. Therefore, we investigate the morphometric build-up of patterned grounds with photogrammetry techniques in combination with physicochemical soil analyses in the hyper-arid Atacama Desert and in periglacial Spitsbergen for comparing our results with those from Mars. Based on these data we aim to derive patterned ground formation processes and evaluate their habitability. A better understanding of patterned ground formation will also improve our understanding of the landscape evolution of the Atacama Desert, as well as for Mars and their potential past and present habitability

elib-URL des Eintrags:https://elib.dlr.de/125708/
Dokumentart:Konferenzbeitrag (Poster)
Titel:Polygonated soils in the hyper-arid Atacama Desert and their relevance for patterned ground on Mars
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Sager, ChristofCenter of Astronomy & Astrophysics, Technical University BerlinNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Airo, A.Center of Astronomy & Astrophysics, Technical University Berlin, 10623 Berlin, GermanyNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Arens, FelixCenter of Astronomy & Astrophysics, Technical University Berlin, 10623 Berlin, GermanyNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Baque, MickaelMickael.Baque (at) dlr.dehttps://orcid.org/0000-0002-6696-6030NICHT SPEZIFIZIERT
de Vera, Jean Pierre Pauljean-pierre.devera (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Schulze-Makuch, D.TU Berlin, GermanyNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:2018
Referierte Publikation:Nein
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:Atacama, Mars, analogs, patterned ground, polygonated soils
Veranstaltungstitel:3rd Astrobiology Graduates in Europe (AbGradE) symposium
Veranstaltungsort:Berlin, Germany
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:22-24 September 2018
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:Erforschung des Weltraums
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R EW - Erforschung des Weltraums
DLR - Teilgebiet (Projekt, Vorhaben):R - Vorhaben Planetary Evolution and Life (alt)
Standort: Berlin-Adlershof
Institute & Einrichtungen:Institut für Planetenforschung > Leitungsbereich PF
Hinterlegt von: Baqué, Dr. Mickael
Hinterlegt am:08 Jan 2019 09:03
Letzte Änderung:08 Jan 2019 09:03

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