Mathematics – Logic
Scientific paper
Mar 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997sci...275.1633v&link_type=abstract
Science, Vol. 275, No. 5306, p. 1633 - 1638
Mathematics
Logic
62
Meteorites: Mars
Scientific paper
The Martian meteorite ALH84001 contains small, disk-shaped concretions of carbonate with concentric chemical and mineralogical zonation. Oxygen isotope compositions of these concretions, measured by ion microprobe, range from δ18O = +9.5 to +20.50/00. Most of the core of one concretion is homogeneous (16.7±1.20/00) and over 50/00 higher in δ18O than a second concretion. Orthopyroxene that hosts the secondary carbonates is isotopically homogeneous (δ18O = 4.6±1.20/00). Secondary SiO2 has δ18O = 20.40/00. Carbon isotope ratios measured from the core of one concretion average δ13C = 46±80/00, consistent with formation on Mars. The isotopic variations and mineral compositions offer no evidence for high temperature (>650°C) carbonate precipitation and suggest non-equilibrium processes at low temperatures (<≡300°C).
Eiler John M.
Gibson Everett K.
Graham Chris M.
Romanek Christopher S.
Stolper Edward M.
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