New Views Of Mars From Sediment Mineralogy


The first detailed examination of clay mineralogy in its original setting on Mars is offering new insights on the planet’s past habitability, research led by Planetary Science Institute Senior Scientist David T. Vaniman has found.

The sedimentary rock samples tested were collected by NASA’s Mars Science Laboratory rover Curiosity at Yellowknife Bay in Gale Crater on Mars. The rover’s Chemistry and Mineralogy X-Ray Diffraction and Fluorescence (CheMin XRD/XRF) instrument analyzed the samples.

“The in situ X-ray diffraction results reveal the presence of smectite, a type of clay mineral typical of soils and sediments that have not been deeply buried, heated, or otherwise altered,” Vaniman said. “The X-Ray diffraction data are also important for what they do not detect – clay minerals such as chlorite or illite that would have formed in strongly alkaline or hydrothermal fluids.”

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