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COSMOCHEMISTRY iLLUSTRATED Jarosite Stopwatch on MarsJarosite Stopwatch on Mars Jarosite Stopwatch on Mars The Meridiani landing site on Mars is made of.

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Presentation on theme: "COSMOCHEMISTRY iLLUSTRATED Jarosite Stopwatch on MarsJarosite Stopwatch on Mars Jarosite Stopwatch on Mars The Meridiani landing site on Mars is made of."— Presentation transcript:

1 COSMOCHEMISTRY iLLUSTRATED Jarosite Stopwatch on MarsJarosite Stopwatch on Mars Jarosite Stopwatch on Mars The Meridiani landing site on Mars is made of eolian deposits altered by water (driven by a fluctuating water table). Mössbauer spectrometry indicates the presence of jarosite, (Na,K,H)Fe 3 (SO 4 ) 2 (OH) 6. Burns Cliff, Meridiani Planum, Mars ~7m

2 COSMOCHEMISTRY iLLUSTRATED Jarosite StabilityJarosite Stability Jarosite Stopwatch on Mars Jarosite forms early in basalt weathering and at low pH, relatively oxidizing conditions. Diagrams after Elwood Madden et al. (2004)

3 COSMOCHEMISTRY iLLUSTRATED The Jarosite StopwatchThe Jarosite Stopwatch Jarosite Stopwatch on Mars Elwood Madden et al. (2009)

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