Other
Scientific paper
Mar 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28..469g&link_type=abstract
Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 469.
Other
Mars Surface, Meteoritic Composition, Extraterrestrial Life, Carbonates, Pyroxenes, Trace Elements, Mineral Deposits, Solid Solutions, High Temperature, Carbon Isotopes, Oxygen Isotopes, Geochemistry
Scientific paper
Much of the debate about the possibility that there is evidence in ALH84001 for life on Mars will hinge on determining the origin of the carbonate in that meteorite. Currently, there are at least two schools of thought concerning the origin of the ALH84001 carbonate. One idea is that the carbonate formed at very high temperature (more than 650 C). Evidence used for this temperature determination is the solid-solution chemistry of the carbonates. The other proposal suggests a much lower temperature of deposition. The evidence supporting this hypothesis comes from carbon and oxygen isotopic analyses. To test whether either explanation is plausible, theoretical models of hydrothermal alteration of an orthopyroxenitic rock were conducted using established methods of geochmistry. It is concluded that additional data from sources such as isotopes and trace elements are needed to help constrain the temperature and pressure of origin of the carbonates in ALH84001.
Griffith Laura L.
Shock Everett L.
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