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Asynchronous formation of Hesperian and Amazonian-aged deltas on Mars and implications for climate

Hauber, E. and Platz, Thomas and Reiss, Dennis and Le Deit, Laetitia and Kleinhans, M.G. and Marra, W.A. and De Haas, T. and Carbonneau, P. (2013) Asynchronous formation of Hesperian and Amazonian-aged deltas on Mars and implications for climate. Journal of Geophysical Research, 118 (7), pp. 1529-1544. Wiley. DOI: 10.1002/jgre.20107 ISSN 0148-0227

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Official URL: http://onlinelibrary.wiley.com/doi/10.1002/jgre.20107/abstract

Abstract

Most fluvial and lacustrine landforms on Mars are thought to be old and have formed more than ~3.8 Gyr ago, in the Noachian period. After a major climatic transition, surface liquid water became less abundant and finally disappeared almost completely. Recent work has shown that observational evidence for Hesperian and Amazonian aqueous processes is more common than previously recognized, but their nature is poorly understood. Moreover, it is not clear how the paleoclimate of Mars can be constrained by this activity. Here we report our investigation of a population of deltas around the ancient impact basin Chryse Planitia. To test whether the results are globally applicable, we also studied selected deltas with similar morphologies in the eastern hemisphere and found that the results are consistent. We compared the morphology of deltas, feeder channels, and receiving lakes, dated deltas by crater counting and searched for alteration minerals in hyperspectral images. The valleys and associated late-stage deltas were formed by short-lived aqueous processes, as suggested by their morphology and the general lack of associated aqueous alteration minerals. The likely source of water was neither widespread precipitation nor a regionally connected groundwater aquifer, but water mobilized locally from the cryosphere. Delta formation in our study areas occurred from the Early Hesperian to the Late Amazonian and did not require sustained periods of global climatic conditions favoring widespread precipitation. Liquid surface water has been locally present on Mars even after the Noachian, although only episodically, for transient intervals, and widely separated in space.

Item URL in elib:https://elib.dlr.de/83959/
Document Type:Article
Title:Asynchronous formation of Hesperian and Amazonian-aged deltas on Mars and implications for climate
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Hauber, E.ernst.hauber (at) dlr.deUNSPECIFIED
Platz, ThomasFU BerlinUNSPECIFIED
Reiss, DennisUniv. MünsterUNSPECIFIED
Le Deit, Laetitialaetitia.ledeit (at) dlr.deUNSPECIFIED
Kleinhans, M.G.Faculty of Geosciences, Universiteit Utrecht,UNSPECIFIED
Marra, W.A.Faculty of Geosciences, Universiteit Utrecht, NetherlandsUNSPECIFIED
De Haas, T.Faculty of Geosciences, Universiteit Utrecht, Netherlands,UNSPECIFIED
Carbonneau, P.Department of Geography, Durham University, UKUNSPECIFIED
Date:2013
Journal or Publication Title:Journal of Geophysical Research
Refereed publication:Yes
Open Access:No
In DOAJ:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:118
DOI :10.1002/jgre.20107
Page Range:pp. 1529-1544
Publisher:Wiley
ISSN:0148-0227
Status:Published
Keywords:Mars, HRSC, water, ice, deltas, fluvial, lacustrine, climate, chronology, age, sediment
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 Sep 2013 10:04
Last Modified:23 Jan 2014 11:36

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