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Quantifying magnetite magnetofossil contributions to sedimentary magnetizations
- Source :
- Earth and Planetary Science Letters, 382, 58. Elsevier
- Publication Year :
- 2013
-
Abstract
- Under suitable conditions, magnetofossils (the inorganic remains of magnetotactic bacteria) can contribute to the natural remanent magnetization (NRM) of sediments. In recent years, magnetofossils have been shown to be preserved commonly in marine sediments, which makes it essential to quantify their importance in palaeomagnetic recording. In this study, we examine a deep-sea sediment core from offshore of northwestern Western Australia. The magnetic mineral assemblage is dominated by continental detritus and magnetite magnetofossils. By separating magnetofossil and detrital components based on their different demagnetization characteristics, it is possible to quantify their respective contributions to the sedimentary NRM throughout the Brunhes chron. In the studied core, the contribution of magnetofossils to the NRM is controlled by large-scale climate changes, with their relative importance increasing during glacial periods when detrital inputs were low. Our results demonstrate that magnetite magnetofossils can dominate sedimentary NRMs in settings where they are preserved in significant abundances.
- Subjects :
- 010504 meteorology & atmospheric sciences
Magnetotactic bacteria
Natural remanent magnetization
Geochemistry
Detritus (geology)
010502 geochemistry & geophysics
01 natural sciences
magnetofossil
chemistry.chemical_compound
Geochemistry and Petrology
Earth and Planetary Sciences (miscellaneous)
14. Life underwater
Glacial period
biogenic magnetite
Sedimentology
Geomorphology
0105 earth and related environmental sciences
Magnetite
Western Australia
natural remanent magnetization
Geophysics
chemistry
13. Climate action
Space and Planetary Science
Brunhes chron
Sedimentary rock
Magnetofossil
Geology
Subjects
Details
- Language :
- English
- ISSN :
- 0012821X
- Volume :
- 382
- Database :
- OpenAIRE
- Journal :
- Earth and Planetary Science Letters
- Accession number :
- edsair.doi.dedup.....4c57f83965501ee596fe6ee4df3da0a3