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Aqueous dune-like bedforms in Athabasca Valles and neighbouring locations utilized in palaeoflood reconstruction

Aqueous dune-like bedforms in Athabasca Valles and neighbouring locations utilized in palaeoflood reconstruction
Aqueous dune-like bedforms in Athabasca Valles and neighbouring locations utilized in palaeoflood reconstruction
Putative fluvial dunes have been identified within the Athabasca Valles and associated network of channels on Mars. Previous published work identified and measured bedforms in Athabasca Valles using photoclinometry methods on 2-3 m/pixel resolution Mars Orbiter Camera Narrow Angle images, and argued that these were created by an aqueous megaflood that occurred between 2 and 8 million years ago. This event is likely to have occurred due to geological activity associated with the Cerberus Fossae fracture system at the source of Athabasca Vallis. The present study has used higher resolution, 25 cm/pixel images from the Mars Reconnaissance Orbiter HiRISE camera, as well as stereo-derived digital terrain models and GIS software, to re-measure and evaluate these bedforms together with data from newly discovered neighbouring fields of bedforms. The analysis indicates that the bedforms are aqueous dunes, in that they occur in channel locations where dunes would be expected to be preserved and moreover they have geometries very similar to megaflood dunes on Earth. Dune geometries are used to estimate megaflood discharge rates, including uncertainty, which results support previous flood estimates that indicate that a flood with a discharge of ~2 x 26 106m3s-1 created these bedforms.
45-55
Durrant, L.
77bbbfeb-0c86-4ab4-b21a-a9f6f93a9725
Balme, M.R.
a8bda79b-25d8-4faa-90b1-ba546d20e18b
Carling, P.A.
8d252dd9-3c88-4803-81cc-c2ec4c6fa687
Grindrod, P.M.
71b9693c-6cde-4b92-a0ab-e4d7a84f8b32
Durrant, L.
77bbbfeb-0c86-4ab4-b21a-a9f6f93a9725
Balme, M.R.
a8bda79b-25d8-4faa-90b1-ba546d20e18b
Carling, P.A.
8d252dd9-3c88-4803-81cc-c2ec4c6fa687
Grindrod, P.M.
71b9693c-6cde-4b92-a0ab-e4d7a84f8b32

Durrant, L., Balme, M.R., Carling, P.A. and Grindrod, P.M. (2017) Aqueous dune-like bedforms in Athabasca Valles and neighbouring locations utilized in palaeoflood reconstruction. Planetary and Space Science, 148, 45-55. (doi:10.1016/j.pss.2017.10.008).

Record type: Article

Abstract

Putative fluvial dunes have been identified within the Athabasca Valles and associated network of channels on Mars. Previous published work identified and measured bedforms in Athabasca Valles using photoclinometry methods on 2-3 m/pixel resolution Mars Orbiter Camera Narrow Angle images, and argued that these were created by an aqueous megaflood that occurred between 2 and 8 million years ago. This event is likely to have occurred due to geological activity associated with the Cerberus Fossae fracture system at the source of Athabasca Vallis. The present study has used higher resolution, 25 cm/pixel images from the Mars Reconnaissance Orbiter HiRISE camera, as well as stereo-derived digital terrain models and GIS software, to re-measure and evaluate these bedforms together with data from newly discovered neighbouring fields of bedforms. The analysis indicates that the bedforms are aqueous dunes, in that they occur in channel locations where dunes would be expected to be preserved and moreover they have geometries very similar to megaflood dunes on Earth. Dune geometries are used to estimate megaflood discharge rates, including uncertainty, which results support previous flood estimates that indicate that a flood with a discharge of ~2 x 26 106m3s-1 created these bedforms.

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Durrant_flood_dunes_accepted - Accepted Manuscript
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Accepted/In Press date: 16 October 2017
e-pub ahead of print date: 17 October 2017
Published date: 15 November 2017

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Local EPrints ID: 415236
URI: http://eprints.soton.ac.uk/id/eprint/415236
PURE UUID: 9797160f-2e91-4648-aa83-501fcf971dfd

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Date deposited: 03 Nov 2017 17:30
Last modified: 07 Oct 2020 05:53

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