Low-temperature Origin of Carbonates Consistent with Life in ALH84001

Details Low-temperature Origin of Carbonates Consistent with Life in ALH84001 Low-temperature Origin of Carbonates Consistent with Life in ALH84001

May 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997psrd.repte..11t&link_type=abstract

Planetary Science Research Discoveries

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Mars, Martian Meteorite, Alh84001, Life On Mars, Impact Cratering, Carbonates, Geology, Planetary Science

Scientific paper

Much of the evidence for fossil life in Martian meteorite ALH84001 is contained in globules, plates, and veins of chemically-complex carbonate minerals. For life to have existed in this rock, the carbonates must have formed at a temperature low enough to ensure survival, probably less than about 150 C. Two recent papers in the same issue of the journal Science suggest that the carbonates formed at sufficiently low temperatures to permit life. The interpretations stem from measurements of the magnetic properties of minerals in ALH84001 (Kirschvink and others, 1997) and from the chemical and isotopic compositions of carbonates (Valley and others, 1997). Science is rarely so clear cut, of course, and not all data agree with a low-temperature origin. For example, see the PSRD article by Edward Scott about shock effects in ALH84001.

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