MULTI-PHASE SEDIMENT-DISCHARGE DYNAMICS OF SUBGLACIAL DRAINAGE RECORDED BY A GLACIER-LINKED ESKER IN NW TEMPE TERRA, MARS - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Communication Dans Un Congrès Année : 2019

MULTI-PHASE SEDIMENT-DISCHARGE DYNAMICS OF SUBGLACIAL DRAINAGE RECORDED BY A GLACIER-LINKED ESKER IN NW TEMPE TERRA, MARS

Résumé

Introduction: Our recent discoveries of eskers associated with 110-150 Myr old debris-covered glaciers in Phlegra Montes [1] and NW Tempe Terra [2], Mars, indicate that localised wet-based glaciation has occurred in at least two locations during the late Amazonian , despite cold climate conditions. Eskers are sedi-mentary ridges deposited by meltwater flowing through drainage tunnels within or beneath glaciers. In this study, we use new 3D measurements of the NW Tempe Terra esker (46.17 °N, 83.06 °W) to develop a conceptual model for the sediment-discharge dynamics of the esker-forming drainage episode(s). Methods: Following [3], we used a 2 m/pixel digital elevation model derived from High Resolution Imaging Science Experiment (HiRISE) images to measure ridge height (H) and width (W) every ~20 m along the esker. We exclude ridge portions obscured by the parent glacier (Fig 1), as well as transitions between morphological zones. Results: A scatterplot of the raw height and width measurements (Fig 2A) has multiple limbs which correspond to subzones of the esker with common morphological characteristics (Fig 1).
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Dates et versions

hal-02396711 , version 1 (06-12-2019)

Identifiants

  • HAL Id : hal-02396711 , version 1

Citer

F. E G Butcher, M. Balme, C Gallagher, R D Storrar, Susan J. Conway, et al.. MULTI-PHASE SEDIMENT-DISCHARGE DYNAMICS OF SUBGLACIAL DRAINAGE RECORDED BY A GLACIER-LINKED ESKER IN NW TEMPE TERRA, MARS. 50th Lunar and Planetary Science Conference, Mar 2019, The Woodlands, Texas, United States. ⟨hal-02396711⟩
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