NDLI: Nanophase magnetite and pyrrhotite in alh84001 martian meteorite: evidence for an abiotic origin

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Nanophase magnetite and pyrrhotite in alh84001 martian meteorite: evidence for an abiotic origin

Content Provider	NASA Technical Reports Server (NTRS)
Author	Morris, R. V. Lauer II, H. V. Ming, D. W. Golden, D. C.
Copyright Year	2006
Description	The nanophase magnetite crystals in the black rims of pancake-shaped carbonate globules of the Martian meteorite ALH84001 have been studied extensively because of the claim by McKay et al.that they are biogenic in origin. A subpopulation of these magnetite crystals are reported to conform to a unique elongated shape called "truncated hexa-octahedral" or "THO" by Thomas-Keprta et al. They claim these THO magnetite crystals can only be produced by living bacteria thus forming a biomarker in the meteorite. In contrast, thermal decomposition of Fe-rich carbonate has been suggested as an alternate hypothesis for the elongated magnetite formation in ALH84001 carbonates. The experimental and observational evidence for the inorganic formation of nanophase magnetite and pyrrhotite in ALH84001 by decomposition of Fe-rich carbonate in the presence of pyrite are provided.
File Size	181610
Page Count	2
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20080026336
Archival Resource Key	ark:/13960/t3jx3bk4q
Language	English
Publisher Date	2006-01-11
Access Restriction	Open
Subject Keyword	Lunar And Planetary Science And Exploration Magnetite Meteorites Pyrrhotite Nanostructure Characteristics Thermal Decomposition Mars Planet Snc Meteorites Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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