Journal
ICARUS
Volume 242, Issue -, Pages 142-148Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.icarus.2014.08.024
Keywords
Mercury, surface; Geological processes; Regoliths; Image processing; Impact processes
Categories
Funding
- NASA Discovery Program [NAS5-97271, NASW-00002]
- NASA MESSENGER Participating Scientist Grant [NNX08AN29G]
- NASA [NNX08AN29G, 97762] Funding Source: Federal RePORTER
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Analysis of images that were obtained at different phase angles can give clues to the texture of a planetary surface. Here we describe MESSENGER phase-ratio images for features on the surface of Mercury, including hollows on the floor of Eminescu basin, a pyroclastic deposit found within the Caloris basin, and a dark impact-melt flow produced by the impact that formed Waters crater. The results indicate that hollows and the pyroclastic material are characterized by finer particle size or smoother sub-resolution roughness than the ordinary impact-generated regolith. The impact melt flow appears to have a surface that is rougher or consists of coarser particle sizes than the nearby background. (C) 2014 Elsevier Inc. All rights reserved.
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