Paleomagnetic and stable carbon isotope record of ODP Hole 119-738C ...
Distinct magnetic properties of marine sediments that record the Palaeocene-Eocene thermal maximum (PETM) have been suggested to be due to a bacterial magnetofossil signal that is linked to enhanced weathering conditions during the PETM. We document the dominance of bacterial magnetite in deep-sea s...
| Main Authors: | , , , , , , |
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| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
PANGAEA
2012
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| Subjects: | |
| Online Access: | https://dx.doi.org/10.1594/pangaea.792713 https://doi.pangaea.de/10.1594/PANGAEA.792713 |
| Summary: | Distinct magnetic properties of marine sediments that record the Palaeocene-Eocene thermal maximum (PETM) have been suggested to be due to a bacterial magnetofossil signal that is linked to enhanced weathering conditions during the PETM. We document the dominance of bacterial magnetite in deep-sea sediments from southern Kerguelen Plateau (Ocean Drilling Program Hole 738C, southern Ocean) not only during the PETM, but also before and after the thermal event. This occurrence of magnetofossils throughout the PETM indicates that the occurrence of bacterial magnetosomes is not due to a preservation effect. Instead, we suggest that it is due to sustained mild iron-reducing conditions that dissolved the most labile aeolian-derived iron, which favoured continued magnetotactic bacterial activity without being strong enough to dissolve the less reactive magnetite and haematite. Enhanced aeolian haematite abundances at the beginning of the PETM indicate drier conditions on the neighbouring Antarctic continent at those ... : Supplement to: Larrasoaña, Juan C; Roberts, Andrew P; Chang, Liao; Schellenberg, Stephen A; Fitz Gerald, John D; Norris, Richard D; Zachos, James C (2012): Magnetotactic bacterial response to Antarctic dust supply during the Palaeocene-Eocene thermal maximum. Earth and Planetary Science Letters, 333-334, 122-133 ... |
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