Spectral properties of Titan's impact craters imply chemical weathering of its surface

C. D. Neish, J. W. Barnes, C. Sotin, S. Mackenzie, J. M. Soderblom, S. Le Mouélic, R. L. Kirk, B. W. Stiles, M. J. Malaska, A. Le Gall, R. H. Brown, K. H. Baines, B. Buratti, R. N. Clark, P. D. Nicholson

Research output: Contribution to journalArticle

20 Scopus citations

Abstract

We examined the spectral properties of a selection of Titan's impact craters that represent a range of degradation states. The most degraded craters have rims and ejecta blankets with spectral characteristics that suggest that they are more enriched in water ice than the rims and ejecta blankets of the freshest craters on Titan. The progression is consistent with the chemical weathering of Titan's surface. We propose an evolutionary sequence such that Titan's craters expose an intimate mixture of water ice and organic materials, and chemical weathering by methane rainfall removes the soluble organic materials, leaving the insoluble organics and water ice behind. These observations support the idea that fluvial processes are active in Titan's equatorial regions.

Original languageEnglish (US)
Pages (from-to)3746-3754
Number of pages9
JournalGeophysical Research Letters
Volume42
Issue number10
DOIs
StatePublished - May 28 2015

Keywords

  • Titan
  • erosion and weathering
  • impact cratering

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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    Neish, C. D., Barnes, J. W., Sotin, C., Mackenzie, S., Soderblom, J. M., Le Mouélic, S., Kirk, R. L., Stiles, B. W., Malaska, M. J., Le Gall, A., Brown, R. H., Baines, K. H., Buratti, B., Clark, R. N., & Nicholson, P. D. (2015). Spectral properties of Titan's impact craters imply chemical weathering of its surface. Geophysical Research Letters, 42(10), 3746-3754. https://doi.org/10.1002/2015GL063824