Variable features on Mars. VI. An unusual crater streak in Mesogaea |
| |
Authors: | J Veverka Carl Sagan Ronald Greeley |
| |
Institution: | Laboratory for Planetary Studies, Cornell University, Ithaca, New York 14853, USA;University of Santa Clara, Santa Clara, California 95053, USA |
| |
Abstract: | An unusual, prominent dark streak located in Mesogaea (near 8°N, 191°W) is described. Its appearance is unlike that of most dark streaks on Mars, many of which have ragged outlines, are variable on short time-scales, and are presumed to be erosional. The Mesogaea streak has a tapered, smooth outline, and no changes within it were observed. We suggest that this streak is depositional and that the low-albedo material originated within the associated crater itself. The source area is identified with a compact, low-albedo region on the crater floor. Two possible origins for the dark material are suggested: (1) deflation from a recently exposed, relatively unconsolidated subsurface deposit, and (2) production of ash by a volcanic vent. |
| |
Keywords: | |
本文献已被 ScienceDirect 等数据库收录! |
|