Carbonates in ALH84001 - Evidence for kinetically controlled growth

Details Carbonates in ALH84001 - Evidence for kinetically controlled growth Carbonates in ALH84001 - Evidence for kinetically controlled growth

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28..921m&link_type=abstract

Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 921.

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8

Carbonates, Mars Surface, Meteorites, Microscopy, Microcracks

Scientific paper

ALH84001, originally classified as a diogenite, was subsequently recognized as a Martian meteorite. It differs from other Martian meteorites in that it is a coarse-grained orthopyroxene cumulate containing about 1 percent carbonate; it has attained enhanced importance as a result of the recent announcement of possible evidence for relict biogenic activity, especially in the carbonates. The origin of the carbonates is controversial, even to the point of disagreement over the temperature of formation by hundreds of degrees. Several features of the carbonates suggest kinetic control of growth, which may offer an explanation for why different lines of evidence suggest very different formation conditions. We are undertaking a detailed petrographic and chemical study of the carbonates to assess the role of kinetic control in their formation.

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