MER RESULTS II

Yen A. S. * Ming D. W. Gellert R. Clark B. C. Morris R. V. Rodionov D.
Schröder C. Klingelhöfer G.
Subsurface Weathering of Rocks and Soils at Gusev Crater [#1571]
"Data collected from Spirit at Gusev Crater suggest that enhanced weathering of rocks and soils occurs beneath the immediate surface. We believe that this alteration is a result of diurnal condensation of thin-films of water on subsurface materials."

Schröder C. * Klingelhöfer G. Morris R. V. Rodionov D. S. de Souza P. A. Ming D. W.
Yen A. S. Gellert R. Bell J. F. III
Weathering of Basaltic Rocks from the Gusev Plains up into the Columbia Hills from the Perspective of the MER Mössbauer Spectrometer [#2309]
"Mössbauer spectra of rocks at the foot of the Columbia Hills show a decrease in olivine accompanied by an increase in the Fe-oxides magnetite, hematite, and nanophase Fe3+-oxides, suggesting that chemical weathering processes in the presence of water have altered these rocks and outcrops."

Ming D. W. * Morris R. V. Gellert R. Yen A. Bell J. F. III Blaney D. L. Christensen P. R.
Crumpler L. S. Chu P. C. Farrand W. H. Gorevan S. Herkenhoff K. E. Klingelhöfer G.
Rieder R. Rodionov D. S. Ruff S. W. Schröder C. Squyres S. W. Athena Science Team
Geochemical and Mineralogical Indicators for Aqueous Processes on the West Spur of the Columbia Hills in Gusev Crater [#2125]
"The Athena Science Instrument payload onboard the Spirit rover in Gusev crater is providing datasets that suggest the outcrops and rocks on the West Spur of the Columbia Hills are altered by water."

Parker T. J. * Haldemann A. F. C. Athena Science Team
"A Marine Origin for the Meridiani Planum Landing Site? [#2363]
A marine origin for the Opportunity site is discussed, which we feel provides a better ‘fit’ to the localscale results identified by Opportunity, and the regional-scale characteristics of Meridiani Planum provided by data from orbiting spacecraft, when considered together."

ftp://www.lpi.usra.edu/pub/outgoing/lpsc2005/full60.pdf

Bob Clark