Bacterial Presence in Layered Rock Varnish-Possible Mars Analog?

Details Bacterial Presence in Layered Rock Varnish-Possible Mars Analog? Bacterial Presence in Layered Rock Varnish-Possible Mars Analog?

Aug 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000mpse.conf...98k&link_type=abstract

International Conference on Mars Polar Science and Exploration, p. 98

Biology

Exobiology, Bacteria, Geochemistry, Minerals, Rocks, Mars (Planet), Mars Surface, Antarctic Regions, Chemical Composition, Death Valley (Ca), Peru, Transmission Electron Microscopy

Scientific paper

Rock varnish from locations in Death Valley, California; Peru; Antarctica; and Hawaii reveal nanometer scale layering (less than 1 nm to about 75 nm) when studied with transmission electron microscopy (TEM). Parallel layers of clay minerals containing evidence of presumed bacteria were present in all samples. Samples range in age from a few thousand years to perhaps a million years. Diagenesis is relatively limited, as chemical composition is variable, both from top to bottom and along layers in these varnish samples. Also, occasional exotic minerals occur randomly in most varnish sections, and vary in size and hardness, again suggesting relative lack of diagenetic alteration. Additional information can be found in the original extended abstract.

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