NDLI: Search for past life on mars: possible relict biogenic activity in martian meteorite alh84001

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Search for past life on mars: possible relict biogenic activity in martian meteorite alh84001

Content Provider	NASA Technical Reports Server (NTRS)
Author	McKay, David S. Thomas-Keprta, Kathie L. Chillier, Xavier D. F. Gibson Jr., Everett K. Vali, Hojatollah Romanek, Christopher S. Zare, Richard N. Clemett, Simon J. Maechling, Claude R.
Copyright Year	1996
Description	Fresh fracture surfaces of the martian meteorite ALH84001 contain abundant polycyclic aromatic hydrocarbons (PAHs). These fresh fracture surfaces also display carbonate globules. Contamination studies suggest the PAHs are indigenous to the meteorite. High resolution scanning and transmission electron microscopy study of surface textures and internal structures of selected carbonate globules show that the globules contain fine-grained, secondary phases of single-domain magnetite and Fe-monosulfides. The carbonate globules are similar in texture and size to some terrestrial bacterially induced carbonate precipitates. Although inorganic formation is possible, formation of the globules by biogenic processes could explain many of the observed features including the PAHs. The PAHs, the carbonate globules, and their associated secondary mineral phases and textures could thus be fossil remains of a past martian biota.
File Size	890148
Page Count	10
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19970003266
Archival Resource Key	ark:/13960/t0zp8zm9d
Language	English
Publisher Date	1996-08-01
Access Restriction	Open
Subject Keyword	Space Biology Scanning Electron Microscopy Extraterrestrial Life Mineralogy Mars Planet Globules Precipitates Sulfides Transmission Electron Microscopy Meteorites Magnetite Polycyclic Aromatic Hydrocarbons Carbonates 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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