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
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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 MarsMartin Fisk, Oregon State
University
Michael Storrie-Lombardi, Kinohi Institute
contributors
Radu Popa, Portland State University
Olivia Mason, Oregon State University
Ed Vicenzi, Smithsonian Institution
Pillow Lavas
PhotoJonathan Kaye,
UW
PhotoBill Chadwick,
NOAA
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:10.1029/2004GC000755.
Abiotic
Glass
Biotic
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Biotic [oxide]
Abiotic [oxide]
Una
ltere
d [o
xide
]
PCA
ANN
(Sans Expert)
Hawaiian HSDP Archaea
QuickTime™ and aTIFF (LZW) decompressor
are needed to see this picture.
Oregon Dunite withmicrobial 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. 48-68.
Nakhla
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