Magnetic Tests For Magnetosome Chains In Martian Meteorite ALH84001

Details Magnetic Tests For Magnetosome Chains In Martian Meteorite ALH84001 Magnetic Tests For Magnetosome Chains In Martian Meteorite ALH84001

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmgp22a..02w&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #GP22A-02

Physics

1505 Biomagnetism, 1519 Magnetic Mineralogy And Petrology, 5440 Magnetic Fields And Magnetism, 6225 Mars, 6240 Meteorites And Tektites

Scientific paper

Transmission electron microscopy studies have been used to argue that magnetites in carbonates from Martian meteorite ALH84001 have a composition and morphology indistinguishable from that of magnetotactic bacteria and their magnetofossils (1). It has even been claimed from scanning electron microscopy imaging that some ALH84001 magnetites are aligned in chains (2). If true, this would provide dramatic support for the magnetofossil hypothesis because alignment in chains is perhaps the most distinctive of the six crystallographic properties thought to be collectively unique to magnetosomes. The leading alternative hypothesis is that the ALH84001 magnetites are the inorganic products of shock-heating of the carbonates (3, 4). Here we use three rock magnetic techniques-low-temperature cycling, the Moskowitz test (5), and ferromagnetic resonance (FMR)-to demonstrate that most or all of the magnetites in ALH84001 are unusually pure and fine-grained but are not arranged in magnetosome chains. 1. K. L. Thomas-Keprta et al., Geochim. Cosmochim. Acta 64, 4049-4081 (2000). 2. I. E. Friedmann, J. Wierzchos, C. Ascaso, M. Winklhofer, Proc. Natl. Acad. Sci. USA 98, 2176-2181 (2001). 3. D. C. Golden et al., Am. Mineral. 83, 370-375 (2001). 4. D. J. Barber, E. R. D. Scott, Proc. Natl. Acad. Sci. USA 99, 6556-6561 (2002). 5. B. M. Moskowitz, R. B. Frankel, D. A. Bazylinski, Earth Planet. Sci. Lett. 120, 283-300 (1993).

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