(Table 1) Types of giant magnetofossils in ODP holes
Magnetotactic bacteria biomineralize magnetic minerals with precisely controlled size, morphology, and stoichiometry. These cosmopolitan bacteria are widely observed in aquatic environments. If preserved after burial, the inorganic remains of magnetotactic bacteria act as magnetofossils that record...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.815860 2023-05-15T13:49:51+02:00 (Table 1) Types of giant magnetofossils in ODP holes Chang, Liao Roberts, Andrew P Williams, Wyn Fitz Gerald, John D Larrasoaña, Juan C Jovane, Luigi Muxworthy, A R MEDIAN LATITUDE: -48.169425 * MEDIAN LONGITUDE: 57.459750 * SOUTH-BOUND LATITUDE: -64.517000 * WEST-BOUND LONGITUDE: 3.100400 * NORTH-BOUND LATITUDE: -2.742700 * EAST-BOUND LONGITUDE: 82.787800 * DATE/TIME START: 1987-01-18T12:30:00 * DATE/TIME END: 1988-01-17T05:00:00 * MINIMUM DEPTH, sediment/rock: 35.01 m * MAXIMUM DEPTH, sediment/rock: 285.63 m 2012-06-19 text/tab-separated-values, 18 data points https://doi.pangaea.de/10.1594/PANGAEA.815860 https://doi.org/10.1594/PANGAEA.815860 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.815860 https://doi.org/10.1594/PANGAEA.815860 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Chang, Liao; Roberts, Andrew P; Williams, Wyn; Fitz Gerald, John D; Larrasoaña, Juan C; Jovane, Luigi; Muxworthy, A R (2012): Giant magnetofossils and hyperthermal events. Earth and Planetary Science Letters, 351-352, 258-269, https://doi.org/10.1016/j.epsl.2012.07.031 113-689D 115-711A 119-738B 119-738C DEPTH sediment/rock DRILL Drilling/drill rig DSDP/ODP/IODP sample designation Event label Fossils Indian Ocean Joides Resolution Leg113 Leg115 Leg119 Ocean Drilling Program ODP Period (Geological Time Scale) Sample code/label South Atlantic Ocean South Indian Ridge South Indian Ocean Dataset 2012 ftpangaea https://doi.org/10.1594/PANGAEA.815860 https://doi.org/10.1016/j.epsl.2012.07.031 2023-01-20T09:01:16Z Magnetotactic bacteria biomineralize magnetic minerals with precisely controlled size, morphology, and stoichiometry. These cosmopolitan bacteria are widely observed in aquatic environments. If preserved after burial, the inorganic remains of magnetotactic bacteria act as magnetofossils that record ancient geomagnetic field variations. They also have potential to provide paleoenvironmental information. In contrast to conventional magnetofossils, giant magnetofossils (most likely produced by eukaryotic organisms) have only been reported once before from Paleocene-Eocene Thermal Maximum (PETM; 55.8 Ma) sediments on the New Jersey coastal plain. Here, using transmission electron microscopic observations, we present evidence for abundant giant magnetofossils, including previously reported elongated prisms and spindles, and new giant bullet-shaped magnetite crystals, in the Southern Ocean near Antarctica, not only during the PETM, but also shortly before and after the PETM. Moreover, we have discovered giant bullet-shaped magnetite crystals from the equatorial Indian Ocean during the Mid-Eocene Climatic Optimum (~40 Ma). Our results indicate a more widespread geographic, environmental, and temporal distribution of giant magnetofossils in the geological record with a link to "hyperthermal" events. Enhanced global weathering during hyperthermals, and expanded suboxic diagenetic environments, probably provided more bioavailable iron that enabled biomineralization of giant magnetofossils. Our micromagnetic modelling indicates the presence of magnetic multi-domain (i.e., not ideal for navigation) and single domain (i.e., ideal for navigation) structures in the giant magnetite particles depending on their size, morphology and spatial arrangement. Different giant magnetite crystal morphologies appear to have had different biological functions, including magnetotaxis and other non-navigational purposes. Our observations suggest that hyperthermals provided ideal conditions for giant magnetofossils, and that these organisms ... Dataset Antarc* Antarctica South Atlantic Ocean Southern Ocean PANGAEA - Data Publisher for Earth & Environmental Science Indian Southern Ocean ENVELOPE(3.100400,82.787800,-2.742700,-64.517000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
113-689D 115-711A 119-738B 119-738C DEPTH sediment/rock DRILL Drilling/drill rig DSDP/ODP/IODP sample designation Event label Fossils Indian Ocean Joides Resolution Leg113 Leg115 Leg119 Ocean Drilling Program ODP Period (Geological Time Scale) Sample code/label South Atlantic Ocean South Indian Ridge South Indian Ocean |
spellingShingle |
113-689D 115-711A 119-738B 119-738C DEPTH sediment/rock DRILL Drilling/drill rig DSDP/ODP/IODP sample designation Event label Fossils Indian Ocean Joides Resolution Leg113 Leg115 Leg119 Ocean Drilling Program ODP Period (Geological Time Scale) Sample code/label South Atlantic Ocean South Indian Ridge South Indian Ocean Chang, Liao Roberts, Andrew P Williams, Wyn Fitz Gerald, John D Larrasoaña, Juan C Jovane, Luigi Muxworthy, A R (Table 1) Types of giant magnetofossils in ODP holes |
topic_facet |
113-689D 115-711A 119-738B 119-738C DEPTH sediment/rock DRILL Drilling/drill rig DSDP/ODP/IODP sample designation Event label Fossils Indian Ocean Joides Resolution Leg113 Leg115 Leg119 Ocean Drilling Program ODP Period (Geological Time Scale) Sample code/label South Atlantic Ocean South Indian Ridge South Indian Ocean |
description |
Magnetotactic bacteria biomineralize magnetic minerals with precisely controlled size, morphology, and stoichiometry. These cosmopolitan bacteria are widely observed in aquatic environments. If preserved after burial, the inorganic remains of magnetotactic bacteria act as magnetofossils that record ancient geomagnetic field variations. They also have potential to provide paleoenvironmental information. In contrast to conventional magnetofossils, giant magnetofossils (most likely produced by eukaryotic organisms) have only been reported once before from Paleocene-Eocene Thermal Maximum (PETM; 55.8 Ma) sediments on the New Jersey coastal plain. Here, using transmission electron microscopic observations, we present evidence for abundant giant magnetofossils, including previously reported elongated prisms and spindles, and new giant bullet-shaped magnetite crystals, in the Southern Ocean near Antarctica, not only during the PETM, but also shortly before and after the PETM. Moreover, we have discovered giant bullet-shaped magnetite crystals from the equatorial Indian Ocean during the Mid-Eocene Climatic Optimum (~40 Ma). Our results indicate a more widespread geographic, environmental, and temporal distribution of giant magnetofossils in the geological record with a link to "hyperthermal" events. Enhanced global weathering during hyperthermals, and expanded suboxic diagenetic environments, probably provided more bioavailable iron that enabled biomineralization of giant magnetofossils. Our micromagnetic modelling indicates the presence of magnetic multi-domain (i.e., not ideal for navigation) and single domain (i.e., ideal for navigation) structures in the giant magnetite particles depending on their size, morphology and spatial arrangement. Different giant magnetite crystal morphologies appear to have had different biological functions, including magnetotaxis and other non-navigational purposes. Our observations suggest that hyperthermals provided ideal conditions for giant magnetofossils, and that these organisms ... |
format |
Dataset |
author |
Chang, Liao Roberts, Andrew P Williams, Wyn Fitz Gerald, John D Larrasoaña, Juan C Jovane, Luigi Muxworthy, A R |
author_facet |
Chang, Liao Roberts, Andrew P Williams, Wyn Fitz Gerald, John D Larrasoaña, Juan C Jovane, Luigi Muxworthy, A R |
author_sort |
Chang, Liao |
title |
(Table 1) Types of giant magnetofossils in ODP holes |
title_short |
(Table 1) Types of giant magnetofossils in ODP holes |
title_full |
(Table 1) Types of giant magnetofossils in ODP holes |
title_fullStr |
(Table 1) Types of giant magnetofossils in ODP holes |
title_full_unstemmed |
(Table 1) Types of giant magnetofossils in ODP holes |
title_sort |
(table 1) types of giant magnetofossils in odp holes |
publisher |
PANGAEA |
publishDate |
2012 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.815860 https://doi.org/10.1594/PANGAEA.815860 |
op_coverage |
MEDIAN LATITUDE: -48.169425 * MEDIAN LONGITUDE: 57.459750 * SOUTH-BOUND LATITUDE: -64.517000 * WEST-BOUND LONGITUDE: 3.100400 * NORTH-BOUND LATITUDE: -2.742700 * EAST-BOUND LONGITUDE: 82.787800 * DATE/TIME START: 1987-01-18T12:30:00 * DATE/TIME END: 1988-01-17T05:00:00 * MINIMUM DEPTH, sediment/rock: 35.01 m * MAXIMUM DEPTH, sediment/rock: 285.63 m |
long_lat |
ENVELOPE(3.100400,82.787800,-2.742700,-64.517000) |
geographic |
Indian Southern Ocean |
geographic_facet |
Indian Southern Ocean |
genre |
Antarc* Antarctica South Atlantic Ocean Southern Ocean |
genre_facet |
Antarc* Antarctica South Atlantic Ocean Southern Ocean |
op_source |
Supplement to: Chang, Liao; Roberts, Andrew P; Williams, Wyn; Fitz Gerald, John D; Larrasoaña, Juan C; Jovane, Luigi; Muxworthy, A R (2012): Giant magnetofossils and hyperthermal events. Earth and Planetary Science Letters, 351-352, 258-269, https://doi.org/10.1016/j.epsl.2012.07.031 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.815860 https://doi.org/10.1594/PANGAEA.815860 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.815860 https://doi.org/10.1016/j.epsl.2012.07.031 |
_version_ |
1766252409501253632 |