A possible high-temperature origin for the carbonates in the martian meteorite ALH84001
Article Abstract:
The carbonates present in the martian meteorite Allan Hills 84001 have been formed by the reaction of ultramafic host rock and hot CO2-rich fluids during an impact event. The lack of hydrous minerals and the major-element content analysis of the carbonates supports the formation of the carbonates from a hot fluid. The disequilibrium in oxygen isotopes, carbonate mineral zoning and sequence of mineral formation also support carbonate formation by impact-caused metasomatism. Both the hot CO2 fluid and the conduits it flowed through were created by impact processes.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1996
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Petrological evidence for shock melting of carbonates in the martian meteorite ALH84001
Article Abstract:
Petrological investigations of the meteorite ALH84001 indicate that the carbonates in this shocked igneous rock probably could not have formed at low temperatures. It is likely that they crystallized from shock-melted material. This goes against the claim that the carbonates formed at low temperatures and that they formed biogenically. It is possible that organic compounds which may be of biogenic origin and are linked with martian carbonate could have survived shocks. However, they could also have arisen during post-shock cooling.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1997
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Iron meteorite evidence for early formation and catastrophic disruption of protoplanets
Article Abstract:
The cooling rates are reported for group IVA iron meteorites that range from 100 to 6,000 K [Myr.-1], which increases with decreasing bulk Ni. The results have provided evidence that fully differentiated bodies are destroyed very early, which is an essential factor for understanding the distribution of differentiated asteroids and the rarity of olivine-rich asteroids and meteorites.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2007
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