Geomorphological map of the Afekan Crater region, Titan

Terrain relationships in the equatorial and mid-latitude regions

Michael J. Malaska, Rosaly M C Lopes, David Williams, Catherine D. Neish, Anezina Solomonidou, Jason M. Soderblom, Ashley M. Schoenfeld, Sam P D Birch, Alex G. Hayes, Alice Le Gall, Michael A. Janssen, Thomas G. Farr, Ralph D. Lorenz, Jani Radebaugh, Elizabeth P. Turtle

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

We carried out geomorphological mapping in a mid-latitude area surrounding the Afekan Crater region on Titan. We used Cassini RADAR (Synthetic Aperture Radar mode) data as the basemap, supplemented by Cassini RADAR microwave emissivity, Imaging Science Subsystem (ISS) infrared data, Visual and Infrared Mapping Spectrometer (VIMS) spectral images, and topography derived from Synthetic Aperture Radar (SAR). Mapping was done at a spatial scale of 300 m/pixel, which corresponds to a map scale of 1:800,000. We describe multiple terrain units and their spatial relations. We describe five broad classes of units that are in agreement with previous mapping efforts: crater, labyrinth, hummocky/mountainous, plains, and dune terrain classes. We subdivide these into seven crater units, four hummocky/mountainous units, six plains units, and three dunes units. Our results show that plains are the dominant class of terrain unit in Titan's mid latitudes. Of the plains units, the undifferentiated plains are the largest by total areal extent in the mapped region, accounting for over 45% of the mapped area. We developed a stratigraphic sequence that has the hummocky/mountainous and labyrinth terrains as the oldest units. The observed properties of the hummocky/mountainous terrain are consistent with fractured water ice materials, while the labyrinth terrains are consistent with organic materials. The youngest units are the dune units and streak-like plains units, with the undifferentiated plains units being of intermediate age. The microwave emissivity of the undifferentiated plains and dune units are consistent with organic materials. Given their properties and stratigraphic placement, we conclude that the hummocky/mountainous terrains are most consistent with the presumed crustal materials of Titan. The plains materials are consistent with deposits resulting from the transport and emplacement of organic-rich materials predominantly by aeolian mechanisms. Our geomorphological mapping results are consistent with the equatorial and mid-latitudes of Titan being dominated by organic materials that have been deposited and emplaced by aeolian activity.

Original languageEnglish (US)
Pages (from-to)130-161
Number of pages32
JournalIcarus
Volume270
DOIs
StatePublished - May 15 2016

Fingerprint

Titan
plains
craters
crater
dunes
labyrinth
organic materials
dune
geomorphological mapping
synthetic aperture radar
emissivity
plain
microwaves
eolian process
material
topography
pixel
emplacement
ice
spectrometer

Keywords

  • Geological processes
  • Titan
  • Titan, surface

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Malaska, M. J., Lopes, R. M. C., Williams, D., Neish, C. D., Solomonidou, A., Soderblom, J. M., ... Turtle, E. P. (2016). Geomorphological map of the Afekan Crater region, Titan: Terrain relationships in the equatorial and mid-latitude regions. Icarus, 270, 130-161. https://doi.org/10.1016/j.icarus.2016.02.021

Geomorphological map of the Afekan Crater region, Titan : Terrain relationships in the equatorial and mid-latitude regions. / Malaska, Michael J.; Lopes, Rosaly M C; Williams, David; Neish, Catherine D.; Solomonidou, Anezina; Soderblom, Jason M.; Schoenfeld, Ashley M.; Birch, Sam P D; Hayes, Alex G.; Le Gall, Alice; Janssen, Michael A.; Farr, Thomas G.; Lorenz, Ralph D.; Radebaugh, Jani; Turtle, Elizabeth P.

In: Icarus, Vol. 270, 15.05.2016, p. 130-161.

Research output: Contribution to journalArticle

Malaska, MJ, Lopes, RMC, Williams, D, Neish, CD, Solomonidou, A, Soderblom, JM, Schoenfeld, AM, Birch, SPD, Hayes, AG, Le Gall, A, Janssen, MA, Farr, TG, Lorenz, RD, Radebaugh, J & Turtle, EP 2016, 'Geomorphological map of the Afekan Crater region, Titan: Terrain relationships in the equatorial and mid-latitude regions', Icarus, vol. 270, pp. 130-161. https://doi.org/10.1016/j.icarus.2016.02.021
Malaska, Michael J. ; Lopes, Rosaly M C ; Williams, David ; Neish, Catherine D. ; Solomonidou, Anezina ; Soderblom, Jason M. ; Schoenfeld, Ashley M. ; Birch, Sam P D ; Hayes, Alex G. ; Le Gall, Alice ; Janssen, Michael A. ; Farr, Thomas G. ; Lorenz, Ralph D. ; Radebaugh, Jani ; Turtle, Elizabeth P. / Geomorphological map of the Afekan Crater region, Titan : Terrain relationships in the equatorial and mid-latitude regions. In: Icarus. 2016 ; Vol. 270. pp. 130-161.
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AU - Williams, David

AU - Neish, Catherine D.

AU - Solomonidou, Anezina

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N2 - We carried out geomorphological mapping in a mid-latitude area surrounding the Afekan Crater region on Titan. We used Cassini RADAR (Synthetic Aperture Radar mode) data as the basemap, supplemented by Cassini RADAR microwave emissivity, Imaging Science Subsystem (ISS) infrared data, Visual and Infrared Mapping Spectrometer (VIMS) spectral images, and topography derived from Synthetic Aperture Radar (SAR). Mapping was done at a spatial scale of 300 m/pixel, which corresponds to a map scale of 1:800,000. We describe multiple terrain units and their spatial relations. We describe five broad classes of units that are in agreement with previous mapping efforts: crater, labyrinth, hummocky/mountainous, plains, and dune terrain classes. We subdivide these into seven crater units, four hummocky/mountainous units, six plains units, and three dunes units. Our results show that plains are the dominant class of terrain unit in Titan's mid latitudes. Of the plains units, the undifferentiated plains are the largest by total areal extent in the mapped region, accounting for over 45% of the mapped area. We developed a stratigraphic sequence that has the hummocky/mountainous and labyrinth terrains as the oldest units. The observed properties of the hummocky/mountainous terrain are consistent with fractured water ice materials, while the labyrinth terrains are consistent with organic materials. The youngest units are the dune units and streak-like plains units, with the undifferentiated plains units being of intermediate age. The microwave emissivity of the undifferentiated plains and dune units are consistent with organic materials. Given their properties and stratigraphic placement, we conclude that the hummocky/mountainous terrains are most consistent with the presumed crustal materials of Titan. The plains materials are consistent with deposits resulting from the transport and emplacement of organic-rich materials predominantly by aeolian mechanisms. Our geomorphological mapping results are consistent with the equatorial and mid-latitudes of Titan being dominated by organic materials that have been deposited and emplaced by aeolian activity.

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