Mineralogical study of the hyper-arid Mars like-soils from Pampas de La Joya, southern Peru and its implications in the geochemistry of dry environments

Details Mineralogical study of the hyper-arid Mars like-soils from Pampas de La Joya, southern Peru and its implications in the geochemistry of dry environments Mineralogical study of the hyper-arid Mars like-soils from Pampas de La Joya, southern Peru and its implications in the geochemistry of dry environments

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf.1798v&link_type=abstract

EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.1798

Biology

Scientific paper

The Pampas de La Joya is located in southern Peru between 16°S and 17°S latitude and is part of the hyper-arid region of the Atacama Desert. Recently, this place has acquired an increased interest by astrobiology community because it presents Marslike soils regarding with the very low levels of organic matter, high oxidant activity, marked driest conditions, and very low levels of microorganisms. This work describes petrology, X-ray diffraction, and EDS-electron microscopy of 119 samples collected on the surface and shallow subsurface of the desert. The samples were divided in six types of soil due to its physical properties. Overall, our results show that the detrital components of the soils come essentially from the Andean volcanic chain and local outcrops of Precambriam gneisses and Cretaceous granitic batholiths. Current and past microclimates allowed the formation of paleolakes and the consequent heterogeneous deposits of evaporitic minerals.

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