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Truncated hexa-octahedral magnetite crystals in ALH84001: presumptive biosignatures.

Abstract：

:McKay et al. [(1996) Science 273, 924-930] suggested that carbonate globules in the meteorite ALH84001 contained the fossil remains of Martian microbes. We have characterized a subpopulation of magnetite (Fe(3)O(4)) crystals present in abundance within the Fe-rich rims of these carbonate globules. We find these Martian magnetites to be both chemically and physically identical to terrestrial, biogenically precipitated, intracellular magnetites produced by magnetotactic bacteria strain MV-1. Specifically, both magnetite populations are single-domain and chemically pure, and exhibit a unique crystal habit we describe as truncated hexa-octahedral. There are no known reports of inorganic processes to explain the observation of truncated hexa-octahedral magnetites in a terrestrial sample. In bacteria strain MV-1 their presence is therefore likely a product of Natural Selection. Unless there is an unknown and unexplained inorganic process on Mars that is conspicuously absent on the Earth and forms truncated hexa-octahedral magnetites, we suggest that these magnetite crystals in the Martian meteorite ALH84001 were likely produced by a biogenic process. As such, these crystals are interpreted as Martian magnetofossils and constitute evidence of the oldest life yet found.

journal_name

Proc Natl Acad Sci U S A

journal_title

Proceedings of the National Academy of Sciences of the United States of America

authors

Thomas-Keprta KL,Clemett SJ,Bazylinski DA,Kirschvink JL,McKay DS,Wentworth SJ,Vali H,Gibson EK Jr,McKay MF,Romanek CS

doi

10.1073/pnas.051500898

keywords:

subject

Has Abstract

pub_date

2001-02-27 00:00:00

pages

2164-9

issue

5

eissn

0027-8424

issn

1091-6490

pii

98/5/2164

journal_volume

98

pub_type

杂志文章

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