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Mars Analog Tunable Laser Spectroscopy at a Site of Active Serpentinization

Steve Vance Jet Propulsion Laboratory, Caltech, MS 183-401, 4800 Oak Grove Dr., Pasadena, CA 91024 (svance@jpl.nasa.gov) The Tunable Laser Spectrometer (TLS) is one of three instruments (QMS, GC, TLS) that comprise the Sample Acquisition Mission (SAM) on NASAs 2011 Mars Science Laboratory (MSL). TLS has unprecedented capability for measuring methane, water and carbon dioxide abundances in the martian atmosphere and in gas evolved from heated soil samples. In addition, TLS will measure the C/C isotope ratios in both CH4 and CO2 and the O/O/O isotope ratios in CO2. Comparison among atmospheric and soil isotope ratios promises insight into the role of water in Mars’s interior, and potentially life-sustaining fluid-rock interactions. We discuss measurements of isotope compositions from spring samples collected at The Cedars, a site of active serpentinization and possibly an analog for the Nili Fossae, using tunable laser spectroscopy with instrumentation similar to TLS. Comparable measurements can be made by TLS when MSL reaches its destination.