GSA Annual Meeting in Phoenix, Arizona, USA - 2019

Paper No. 86-10
Presentation Time: 10:30 AM


KHULLER, Aditya, Arizona State University, Tempe, AZ 85281, DINIEGA, Serina, Jet Propulsion Laboratory, M/S 321-630, 4800 Oak Grove Drive, Pasadena, CA 91109, SCHULTZ, Priscilla, University of California/Riverside, Riverside, CA 92521, FLORES ESPINOZA, Rodrigo, Jet Propulsion Laboratory, Pasadena, CA 91109, NIELD, Joanna M., Geography and Environment, University of Southampton, University Road, Highfield, Southampton, SO171BJ, United Kingdom, WIGGS, Giles F.S., School of Geography and the Environment, University of Oxford, South Parks Road, Oxford, OX1 3QY, United Kingdom and BADDOCK, Matthew C., Department of Geography, Loughborough University, Loughborough, LE11 3TU, United Kingdom

Sand dunes form on a variety of planetary bodies, provided there is enough atmospheric pressure and wind velocity for saltation and deposition to occur, and there are source materials to erode, be transported and get sorted into dunes. The observance, location and properties of these landforms is hugely informative, with implications on regional, and planetary scale circulation, dust cycling and erosion. Dune field composition and thermophysical properties can provide indications on grain size sorting and local environmental conditions, coupled with source rock properties.

This work aims to use visible and near-infrared (VNIR) and thermal infrared (TIR) data from CRISM, THEMIS and TES to characterize the composition and thermophysical properties of aeolian dunes on Mars, building from previous compositional surveys (e.g., Tirsch et al., 2011; Chojnacki et al., 2014; Pan and Rogers, 2017). Equatorial (30° S – 30° N) dune fields will be the first focus, in order to avoid the potential complications associated with characterizing dunes with significant CO2 frost interaction. The composition of local surroundings will also be noted, to infer contextual relationships between potential source materials and dune compositions. This effort will complement work under The Origin of Aeolian Dunes (TOAD) project by exploring relationships between sand composition and dune field evolution (Diniega et al., this conference).

References: [1] Tirsch, D. et al. (2011). JGR, 116 (E3). [2] Chojnacki, M. et al. (2014). Icarus, 230, 96-142. [3] Pan, C. and Rogers, A. D. (2017). Icarus, 282, 56-69. [4] Diniega et al., this conference.