PIA05467: History Leaves Salts Behind
These plots, or spectra, show that a rock dubbed 'McKittrick' near NASA's Mars Exploration Rover Opportunity's landing site at Meridiani Planum, Mars, has higher concentrations of sulfur and bromine than a nearby patch of soil nicknamed 'Tarmac.'
 Target Name:  Mars
 Is a satellite of:  Sol (our sun)
 Mission:  Mars Exploration Rover (MER) 
 Spacecraft:  Opportunity
 Instrument:  Alpha Particle X-ray Spectrometer 
 Product Size:  1920 x 1080 pixels (w x h) 
 Produced By:  JPL 
 Full-Res TIFF:  PIA05467.tif (600.3 kB)
 Full-Res JPEG:  PIA05467.jpg (143.3 kB)  

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Original Caption Released with Image:
These plots, or spectra, show that a rock dubbed "McKittrick" near the Mars Exploration Rover Opportunity's landing site at Meridiani Planum, Mars, has higher concentrations of sulfur and bromine than a nearby patch of soil nicknamed "Tarmac." These data were taken by Opportunity's alpha particle X-ray spectrometer, which uses curium-244 to assess the elemental composition of rocks and soil. Only portions of the targets' full spectra are shown to highlight the significant differences in elemental concentrations between "McKittrick" and "Tarmac." Intensities are plotted on a logarithmic scale.

A nearby rock named Guadalupe similarly has extremely high concentrations of sulfur, but very little bromine. This "element fractionation" typically occurs when a watery brine slowly evaporates and various salt compounds are precipitated in sequence.

Image Credit:
NASA/JPL/Cornell/Max Planck Institute

Image Addition Date:
2004-03-02