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dc.contributor.authorButcher, Frances E Gen_UK
dc.contributor.authorBalme, Matthew Ren_UK
dc.contributor.authorConway, Susan Jen_UK
dc.contributor.authorGallagher, Colmanen_UK
dc.contributor.authorArnold, Neil Sen_UK
dc.contributor.authorStorrar, Robert Den_UK
dc.contributor.authorLewis, Stephen Ren_UK
dc.contributor.authorHagermann, Axelen_UK
dc.description.abstractWe present a systematic, metre-scale characterisation of the 3D morphometry of an esker on Mars, and the first attempt to reconstruct the multi-stage dynamics of esker formation on Mars. Eskers are sinuous ridges comprising sediment deposited by meltwater draining through ice-confined tunnels within or beneath glaciers. Detailed morphometric insights into eskers on Mars are important for (i) informing morphometric tests of whether sinuous ridges elsewhere on Mars are eskers, and (ii) informing modelling experiments which aim to reconstruct the glaciological and environmental controls on esker formation on Mars. We use a digital elevation model generated from High Resolution Imaging Science Experiment (HiRISE) images to characterise the height and width of an extremely rare esker associated with a late-Amazonian-aged viscous flow feature (debris-covered glacier) in NW Tempe Terra, Mars. Our measurements suggest that the NW Tempe Terra esker is a ‘stacked’ formation comprising an underlying ‘lower member’ ridge that is superposed by a narrower ‘upper member’ ridge. We used a novel morphometric approach to test whether the apparent stacking records two distinct esker deposition regimes (either within the same drainage episode, or within temporally-separated drainage episodes). This approach posits that esker crest morphology is controlled by primary esker formation processes and, by extension, that portions of eskers with similar crest morphologies should have similar morphometric relationships. We predicted the morphometric relationships described by the constituent upper and lower member ridges based on ‘reference relationships’ observed for morphologically-similar portions of the esker where no evidence of stacking was observed. Our observations corresponded well with the predicted relationships, supporting our stacked esker hypothesis. We propose conceptual models, which invoke spatial and temporal variations in sediment supply and meltwater discharge, to explain the stacked morphology. These models are informed by morpho-sedimentary relationships observed along eskers on Earth.en_UK
dc.publisherElsevier BVen_UK
dc.relationButcher FEG, Balme MR, Conway SJ, Gallagher C, Arnold NS, Storrar RD, Lewis SR & Hagermann A (2020) Morphometry of a glacier-linked esker in NW Tempe Terra, Mars, and implications for sediment-discharge dynamics of subglacial drainage. Earth and Planetary Science Letters, 542, Art. No.: 116325.
dc.rightsThis is an open access article distributed under the terms of the Creative Commons CC-BY license (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. You are not required to obtain permission to reuse this article.en_UK
dc.subjectMars geomorphologyen_UK
dc.subjectglaciers on Marsen_UK
dc.subjectwet-based glaciationen_UK
dc.subjectglacial hydrologyen_UK
dc.titleMorphometry of a glacier-linked esker in NW Tempe Terra, Mars, and implications for sediment-discharge dynamics of subglacial drainageen_UK
dc.typeJournal Articleen_UK
dc.citation.jtitleEarth and Planetary Science Lettersen_UK
dc.type.statusVoR - Version of Recorden_UK
dc.contributor.funderUK Space Agencyen_UK
dc.contributor.funderCentre National d’Etudes Spatialesen_UK
dc.contributor.funderUK Space Agencyen_UK
dc.contributor.funderUK Space Agencyen_UK
dc.contributor.funderUK Space Agencyen_UK
dc.contributor.funderUK Space Agencyen_UK
dc.contributor.funderUK Space Agencyen_UK
dc.contributor.funderHorizon 2020 Framework Programmeen_UK
dc.contributor.funderUK Space Agencyen_UK
dc.contributor.funderOpen Universityen_UK
dc.contributor.funderScience and Technology Facilities Councilen_UK
dc.contributor.affiliationThe Open Universityen_UK
dc.contributor.affiliationThe Open Universityen_UK
dc.contributor.affiliationUniversity of Nantesen_UK
dc.contributor.affiliationUniversity College Dublin (UCD)en_UK
dc.contributor.affiliationUniversity of Cambridgeen_UK
dc.contributor.affiliationSheffield Hallam Universityen_UK
dc.contributor.affiliationThe Open Universityen_UK
dc.contributor.affiliationBiological and Environmental Sciencesen_UK
Appears in Collections:Biological and Environmental Sciences Journal Articles

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