Geomorphological map of the South Belet region of Titan: An exploration of Mid-Latitude-to-Pole transition zones

Ashley Marie Schoenfeld (1) , Rosaly M. C. Lopes (1) , Michael Malaska (1) , Anezina Solomonidou (1) , Samuel Birch (2) , Alexander Hayes (2) , David A. Williams (3) , Michael A. Janssen (1) , Alice Le Gall (4, 5) , Elizabeth P. Turtle (6)

1 JPL - Jet Propulsion Laboratory
2 Department of Astronomy [Ithaca]
3 SESE - ASU School of Earth and Space Exploration
4 ESTER - LATMOS
5 PLANETO - LATMOS
6 APL - Johns Hopkins University Applied Physics Laboratory [Laurel, MD]

We carried out detailed geomorphological mapping of Titan's mid-latitude region south of the Belet Sand Sea. We used radar data collected by Cassini's Synthetic Aperture Radar (SAR) as our basemap, supplemented by spectro-images from VIMS, images from ISS, SARtopo, and microwave emissivity datasets. We mapped at a scale of 1:800,000 in all areas of the South Belet region covered by SAR swaths, taking into consideration the 300 m/pixel resolution of the swaths. For the mid-latitudes, we have defined five broad classes of terrains following Malaska et al. (2016). These terrain classes are craters, hummocky/mountainous, labyrinth, plains, and dunes. We have found that the hummocky/mountainous terrains are the oldest, with a radiometric signature consistent with icy materials. Dunes are the youngest units and return a radiometric signature consistent with organic sediments. The South Belet region of Titan is primarily covered by the dune and plain units (specifically the undifferentiated plains) typical of the mid-latitudes (Malaska et al. 2016). Previous mapping efforts of the mid-latitude regions of Titan (Lopes et al. 2016; Malaska et al. 2016) have indicated that these regions are predominately modified and influenced by aeolian activities. A plain unit designated "scalloped plains" is prominently featured between the 50°S and 60°S latitudes of this region. In this area we also find a terrain unit (dark irregular plains) that has been interpreted as damp materials saturated with liquid hydrocarbons (Malaska et al 2016; Hayes et al. 2008). We also note a higher identification of fluvial channels starting at this latitude zone and extending poleward. We suggest that these features demark the transition zone between mid-latitude/equatorial aeolian-dominated processes and fluvial-dominated processes prevailing at the poles.References: Lopes, R.M.C., et al.: Icarus, 270, 162-182, 2016; Malaska, M., et al.: Icarus, 270, 130-161, 2016; Hayes, A. et al.: Geophys. Res. Lett. 35, L09204, 2008.

Domaines: Physique Atmosphérique et Océanique [physics.ao-ph]; Planétologie et astrophysique de la terre [astro-ph.EP]

Ashley Marie Schoenfeld, Rosaly M. C. Lopes, Michael Malaska, Anezina Solomonidou, Samuel Birch, et al.. Geomorphological map of the South Belet region of Titan: An exploration of Mid-Latitude-to-Pole transition zones. DPS 48 / EPSC 11 (Division for Planetary Sciences and the European Planetary Science Congress), Oct 2016, Pasadena, United States. ⟨insu-01390810⟩