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AGU: Journal of Geophysical Research, Planets

 
Abstract
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Abstract

JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 104, NO. E4, PP. 8729-8746, 1999
doi:10.1029/1998JE900005

Soil-like deposits observed by Sojourner, the Pathfinder rover

Henry J. Moore

U.S. Geological Survey, Menlo Park, California

Donald B. Bickler

Jet Propulsion Laboratory, California Institute of Technology, Pasadena

Joy A. Crisp

Jet Propulsion Laboratory, California Institute of Technology, Pasadena

Howard J. Eisen

Jet Propulsion Laboratory, California Institute of Technology, Pasadena

Jeffrey A. Gensler

Jet Propulsion Laboratory, California Institute of Technology, Pasadena

Albert F. C. Haldemann

Jet Propulsion Laboratory, California Institute of Technology, Pasadena

Jacob R. Matijevic

Jet Propulsion Laboratory, California Institute of Technology, Pasadena

Lisa K. Reid

Jet Propulsion Laboratory, California Institute of Technology, Pasadena

Ferenc Pavlics

Pavlics Engineering, Santa Barbara, California

Most of the soil-like materials at the Pathfinder landing site behave like moderately dense soils on Earth with friction angles near 34°–39° and are called cloddy deposits. Cloddy deposits appear to be poorly sorted with dust-sized to granule-sized mineral or rock grains; they may contain pebbles, small rock fragments, and clods. Thin deposits of porous, compressible drifts with friction angles near 26°–28° are also present. Drifts are fine grained. Cohesions of both types of deposits are small. There may be indurated soil-like deposits and/or coated or crusted rocks. Cloddy deposits may be fluvial sediments of the Ares-Tiu floods, but other origins, such as ejecta from nearby impact craters, should be considered. Drifts are probably dusts that settled from the Martian atmosphere. Remote-sensing signatures of the deposits inferred from rover observations are consistent with those observed from orbit and Earth.

Received 12 February 1998; accepted 24 August 1998; .

Citation: Moore, H. J., D. B. Bickler, J. A. Crisp, H. J. Eisen, J. A. Gensler, A. F. C. Haldemann, J. R. Matijevic, L. K. Reid, and F. Pavlics (1999), Soil-like deposits observed by Sojourner, the Pathfinder rover, J. Geophys. Res., 104(E4), 8729–8746, doi:10.1029/1998JE900005.

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