Magnetic analyses of ODP Hole 119-738B sediments
Magnetotactic bacteria intracellularly biomineralize magnetite of an ideal grain size for recording palaeomagnetic signals. However, bacterial magnetite has only been reported in a few pre-Quaternary records because progressive burial into anoxic diagenetic environments causes its dissolution. Deep-...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.788624 2024-09-15T18:37:17+00:00 Magnetic analyses of ODP Hole 119-738B sediments Roberts, Andrew P Florindo, Fabio Villa, Giuliana Chang, Liao Jovane, Luigi Bohaty, Steven M Larrasoaña, Juan C Heslop, David Fitz Gerald, John D LATITUDE: -62.709000 * LONGITUDE: 82.787800 * DATE/TIME START: 1988-01-10T16:30:00 * DATE/TIME END: 1988-01-11T18:45:00 2011 application/zip, 2 datasets https://doi.pangaea.de/10.1594/PANGAEA.788624 https://doi.org/10.1594/PANGAEA.788624 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.788624 https://doi.org/10.1594/PANGAEA.788624 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Roberts, Andrew P; Florindo, Fabio; Villa, Giuliana; Chang, Liao; Jovane, Luigi; Bohaty, Steven M; Larrasoaña, Juan C; Heslop, David; Fitz Gerald, John D (2011): Magnetotactic bacterial abundance in pelagic marine environments is limited by organic carbon flux and availability of dissolved iron. Earth and Planetary Science Letters, 310(3-4), 441-452, https://doi.org/10.1016/j.epsl.2011.08.011 119-738B DRILL Drilling/drill rig Indian Ocean Joides Resolution Leg119 Ocean Drilling Program ODP dataset publication series 2011 ftpangaea https://doi.org/10.1594/PANGAEA.78862410.1016/j.epsl.2011.08.011 2024-07-24T02:31:21Z Magnetotactic bacteria intracellularly biomineralize magnetite of an ideal grain size for recording palaeomagnetic signals. However, bacterial magnetite has only been reported in a few pre-Quaternary records because progressive burial into anoxic diagenetic environments causes its dissolution. Deep-sea carbonate sequences provide optimal environments for preserving bacterial magnetite due to low rates of organic carbon burial and expanded pore-water redox zonations. Such sequences often do not become anoxic for tens to hundreds of metres below the seafloor. Nevertheless, the biogeochemical factors that control magnetotactic bacterial populations in such settings are not well known. We document the preservation of bacterial magnetite, which dominates the palaeomagnetic signal throughout Eocene pelagic carbonates from the southern Kerguelen Plateau, Southern Ocean. We provide evidence that iron fertilization, associated with increased aeolian dust flux, resulted in surface water eutrophication in the late Eocene that controlled bacterial magnetite abundance via export of organic carbon to the seafloor. Increased flux of aeolian iron-bearing phases also delivered iron to the seafloor, some of which became bioavailable through iron reduction. Our results suggest that magnetotactic bacterial populations in pelagic settings depend crucially on particulate iron and organic carbon delivery to the seafloor. Other/Unknown Material Southern Ocean PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(82.787800,82.787800,-62.709000,-62.709000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
119-738B DRILL Drilling/drill rig Indian Ocean Joides Resolution Leg119 Ocean Drilling Program ODP |
spellingShingle |
119-738B DRILL Drilling/drill rig Indian Ocean Joides Resolution Leg119 Ocean Drilling Program ODP Roberts, Andrew P Florindo, Fabio Villa, Giuliana Chang, Liao Jovane, Luigi Bohaty, Steven M Larrasoaña, Juan C Heslop, David Fitz Gerald, John D Magnetic analyses of ODP Hole 119-738B sediments |
topic_facet |
119-738B DRILL Drilling/drill rig Indian Ocean Joides Resolution Leg119 Ocean Drilling Program ODP |
description |
Magnetotactic bacteria intracellularly biomineralize magnetite of an ideal grain size for recording palaeomagnetic signals. However, bacterial magnetite has only been reported in a few pre-Quaternary records because progressive burial into anoxic diagenetic environments causes its dissolution. Deep-sea carbonate sequences provide optimal environments for preserving bacterial magnetite due to low rates of organic carbon burial and expanded pore-water redox zonations. Such sequences often do not become anoxic for tens to hundreds of metres below the seafloor. Nevertheless, the biogeochemical factors that control magnetotactic bacterial populations in such settings are not well known. We document the preservation of bacterial magnetite, which dominates the palaeomagnetic signal throughout Eocene pelagic carbonates from the southern Kerguelen Plateau, Southern Ocean. We provide evidence that iron fertilization, associated with increased aeolian dust flux, resulted in surface water eutrophication in the late Eocene that controlled bacterial magnetite abundance via export of organic carbon to the seafloor. Increased flux of aeolian iron-bearing phases also delivered iron to the seafloor, some of which became bioavailable through iron reduction. Our results suggest that magnetotactic bacterial populations in pelagic settings depend crucially on particulate iron and organic carbon delivery to the seafloor. |
format |
Other/Unknown Material |
author |
Roberts, Andrew P Florindo, Fabio Villa, Giuliana Chang, Liao Jovane, Luigi Bohaty, Steven M Larrasoaña, Juan C Heslop, David Fitz Gerald, John D |
author_facet |
Roberts, Andrew P Florindo, Fabio Villa, Giuliana Chang, Liao Jovane, Luigi Bohaty, Steven M Larrasoaña, Juan C Heslop, David Fitz Gerald, John D |
author_sort |
Roberts, Andrew P |
title |
Magnetic analyses of ODP Hole 119-738B sediments |
title_short |
Magnetic analyses of ODP Hole 119-738B sediments |
title_full |
Magnetic analyses of ODP Hole 119-738B sediments |
title_fullStr |
Magnetic analyses of ODP Hole 119-738B sediments |
title_full_unstemmed |
Magnetic analyses of ODP Hole 119-738B sediments |
title_sort |
magnetic analyses of odp hole 119-738b sediments |
publisher |
PANGAEA |
publishDate |
2011 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.788624 https://doi.org/10.1594/PANGAEA.788624 |
op_coverage |
LATITUDE: -62.709000 * LONGITUDE: 82.787800 * DATE/TIME START: 1988-01-10T16:30:00 * DATE/TIME END: 1988-01-11T18:45:00 |
long_lat |
ENVELOPE(82.787800,82.787800,-62.709000,-62.709000) |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Supplement to: Roberts, Andrew P; Florindo, Fabio; Villa, Giuliana; Chang, Liao; Jovane, Luigi; Bohaty, Steven M; Larrasoaña, Juan C; Heslop, David; Fitz Gerald, John D (2011): Magnetotactic bacterial abundance in pelagic marine environments is limited by organic carbon flux and availability of dissolved iron. Earth and Planetary Science Letters, 310(3-4), 441-452, https://doi.org/10.1016/j.epsl.2011.08.011 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.788624 https://doi.org/10.1594/PANGAEA.788624 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.78862410.1016/j.epsl.2011.08.011 |
_version_ |
1810481642640244736 |