Origin of Carbonate in Martian Meteorite Allan Hills 84001

Details Origin of Carbonate in Martian Meteorite Allan Hills 84001 Origin of Carbonate in Martian Meteorite Allan Hills 84001

Jan 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mmws.work...44s&link_type=abstract

Workshop on the Issue Martian Meteorites: Where do we Stand and Where are we Going?, p. 44

Mathematics

Logic

Carbon Dioxide, Carbonates, Crystallization, High Temperature, Pyroxenes, Shock Heating, Silicon Dioxide, Snc Meteorites, Abiogenesis, Feldspars, Glass

Scientific paper

A significant argument advanced by McKay et al., in favor of a biogenic origin of the carbonates in ALH 84001 was that abiogenic origins - both low and high temperature - appeared to be less plausible. However, subsequent shock studies have suggested that impact heating may have modified carbonates. We inferred that plagioclase glass and rare silica grains formed from impact melts, and Raman spectroscopy confirmed that plagiociase had been melted at greater than 1200C, suggesting shock pressures exceeded 35-45 GPa. Morphological similarities between grains of plagioclase glass and irregularly shaped carbonates in fractures and the occurrence of intermixed grains in fractures suggested that carbonates may also have been shock heated so that a CO2-rich fluid was injected into cooler-fractured pyroxene during shock decompression causing crystallization in seconds.

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