Properties and distribution of paired candidate stony meteorites at Meridiani Planum, Mars
Article first published online: 20 NOV 2010
Copyright 2010 by the American Geophysical Union.
Journal of Geophysical Research: Planets (1991–2012)
Volume 115, Issue E7, July 2010
How to Cite
2010), Properties and distribution of paired candidate stony meteorites at Meridiani Planum, Mars, J. Geophys. Res., 115, E00F09, doi:10.1029/2010JE003616., et al. (
- Issue published online: 20 NOV 2010
- Article first published online: 20 NOV 2010
- Manuscript Accepted: 29 AUG 2010
- Manuscript Revised: 13 JUL 2010
- Manuscript Received: 2 APR 2010
- meteorite accumulation
 The Mars Exploration Rover Opportunity investigated four rocks, informally dubbed Barberton, Santa Catarina, Santorini, and Kasos, that are possible stony meteorites. Their chemical and mineralogical composition is similar to the howardite, eucrite, and diogenite group but with additional metal, similar to mesosiderite silicate clasts. Because of their virtually identical composition and because they appear to represent a relatively rare group of meteorites, they are probably paired. The four rocks were investigated serendipitously several kilometers apart, suggesting that Opportunity is driving across a larger population of similar rock fragments, maybe a meteorite strewn field. Small amounts of ferric Fe are a result of weathering. We did not observe evidence for fusion crusts. Four iron meteorites were found across the same area. Although mesosiderites are stony irons, a genetic link to these irons is unlikely. The stony meteorites probably fell later than the irons. The current atmosphere is sufficiently dense to land such meteorites at shallow entry angles, and it would disperse fragments over several kilometers upon atmospheric breakup. Alternatively, dispersion by spallation from an impacting meteoroid may have occurred. Santa Catarina and a large accumulation of similar rocks were found at the rim of Victoria crater. It is possible that they are associated with the impactor that created Victoria crater, but our limited knowledge about their distribution cannot exclude mere coincidence.