Searching for Silicate Bioweathering on Earth and Mars Martin Fisk, Oregon State University Michael Storrie-Lombardi, Kinohi Institute contributors Radu.

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Searching for Silicate Bioweathering on Earth and Mars Martin Fisk, Oregon State University Michael Storrie-Lombardi, Kinohi Institute contributors Radu Popa, Portland State University Olivia Mason, Oregon State University Ed Vicenzi, Smithsonian Institution

Probabilistic Classification of Biotic Alteration in Basalts Elemental Abundance Signatures for Abiotic & Biotic Alteration of Ocean Basalts [Na, Mg, Al, Si, P, Cl, K, Ca, Ti, Mn, & Fe] Storrie-Lombardi, M. C. and Fisk, M. R. (2004) Elemental abundances in sub-ocean basalt glass and secondary minerals: evidence of biotic and abiotic alteration Geochem., Geophys., and Geosys. 5 (10), doi: /2004GC Abiotic Glass Biotic PCA ANN (Sans Expert)

Hawaiian HSDP Archaea

Oregon Dunite with microbial galleries and DNA fluorescence

Fisk, M.R, Popa, R., Mason, O.U., Storrie-Lombardi, M.C., and Vicenzi, E. 2006, Iron-Magnesium Silicate Bioweathering on Earth (and Mars?), Astrobiology, 6 (1), p

Nakhla Observations in a Martian Meteorite

Why Choose an Ancient Igneous Rock Site? 1.Provides information on earliest volcanism on the planet. 2.Provides a record to test the hypothesis of early aqueous alteration. 3.Igneous rocks preserve evidence of life for billions of years. 4.Biosignature in igneous rocks can incorporate but do not depend on the presence of classical organic constituents [ H, C, O, N, P]. 5. Biosignatures in igneous rocks are amenable to automated pattern recognition techniques. 6.Igneous rock sites are dry and comply with planetary protection constraints. 7.Multiple sites exist (many already well-surveyed) exhibiting low altitude, low latitude, minimal slope, and minimal wind characteristics.

Ideal Igneous Site Mandatory Exposed Noachian igneous rocks. Excellent if Prolonged exposure to water Dry ever since for preservation. Ideally “Go to” availability of sulfates and layered terrain And of course Surveyed by MOC, MOLA, TES, THEMIS, HSRC, and OMEGA and targeted by MRO/CRISM. Optimize engineering constraints for wind, altitude, latitude, and slope.

SiteLocationAltitude Proponent (km) NE Syrtis Major 10 o N 70 o E Harvey Nili Fossae 22 o N 75 o E -0.6 Mustard Marwth Vallis 22.3 o N343.5 o E -2Bibring Eos Chasma10.9 o S321.7 o E-4.1Hamilton What Site?