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Oxygen and iron isotope studies of magnetite produced by magnetotactic bacteria

Science

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, , , and
DOI: 10.1126/science.285.5435.1892

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Abstract

A series of carefully controlled laboratory studies was carried out to investigate oxygen and iron isotope fractionation during the intracellular production of magnetite (Fe3O4) by two different species of magnetotactic bacteria at temperatures between 4??and 35??C under microaerobic and anaerobic conditions. No detectable fractionation of iron isotopes in the bacterial magnetites was observed. However, oxygen isotope measurements indicated a temperature-dependent fractionation for Fe3O4 and water that is consistent with that observed for Fe3O4 produced extracellularly by thermophilic Fe3+-reducing bacteria. These results contrast with established fractionation curves estimated from either high-temperature experiments or theoretical calculations. With the fractionation curve established in this report, oxygen-18 isotope values of bacterial Fe3O4 may be useful in paleoenvironmental studies for determining the oxygen-18 isotope values of formation waters and for inferring paleotemperatures.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Oxygen and iron isotope studies of magnetite produced by magnetotactic bacteria
Series title:
Science
DOI:
10.1126/science.285.5435.1892
Volume
285
Issue:
5435
Year Published:
1999
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Science
First page:
1892
Last page:
1896