Discovery of giant magnetofossils within and outside of the Palaeocene-Eocene Thermal Maximum in the North Atlantic
Giant magnetofossils have exceptionally large grain sizes and peculiar morphologies compared to conventional biogenic magnetite nanoparticles. The origin of these unusual magnetic crystals is a mystery because there are no known modern analogues. Giant magnetofossils have so far been identified in m...
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ftunivcam:oai:www.repository.cam.ac.uk:1810/333823 2024-01-14T10:08:56+01:00 Discovery of giant magnetofossils within and outside of the Palaeocene-Eocene Thermal Maximum in the North Atlantic Xue, P Chang, L Pei, Z Harrison, RJ 2022-02-09T08:31:40Z application/pdf https://www.repository.cam.ac.uk/handle/1810/333823 https://doi.org/10.17863/CAM.81243 eng eng Elsevier BV Department of Earth Sciences http://dx.doi.org/10.1016/j.epsl.2022.117417 Earth and Planetary Science Letters https://www.repository.cam.ac.uk/handle/1810/333823 doi:10.17863/CAM.81243 Attribution-NonCommercial-NoDerivatives 4.0 International https://creativecommons.org/licenses/by-nc-nd/4.0/ giant magnetofossils biogenic magnetite Palaeocene-Eocene Thermal Maximum biomineralization electron microscopy Article 2022 ftunivcam https://doi.org/10.17863/CAM.81243 2023-12-21T23:28:00Z Giant magnetofossils have exceptionally large grain sizes and peculiar morphologies compared to conventional biogenic magnetite nanoparticles. The origin of these unusual magnetic crystals is a mystery because there are no known modern analogues. Giant magnetofossils have so far been identified in marine sediments deposited during past warming periods, leading to the assumption that these fossils were uniquely tied to ancient hyperthermal events. Here we describe the occurrence of abundant giant magnetofossils within North Atlantic pelagic sediments from International Ocean Discovery Program (IODP) Sites U1403 and U1409 at distinct palaeodepths not only during the Palaeocene-Eocene Thermal Maximum (PETM; ~56 Ma) intervals but also far before (>700 ky earlier than the PEB, Palaeocene-Eocene boundary) and after (>300 ky later than the PEB) the PETM, and in a sample of ~70 Ma age. Our results indicate that giant biogenic magnetite crystals were not uniquely produced during ancient hyperthermal events. Magnetic domain states of giant magnetite particles are investigated using dimensional analysis and micromagnetic simulations. Morphological, compositional, and crystallographic data point towards a potential biogenic origin of those unusual crystals. National Natural Science Foundation of China (NSFC grants 41974074, 42061130214, 41574060). Royal Society-Newton Advanced Fellowship (grant NAF\R1\201096). Article in Journal/Newspaper North Atlantic Apollo - University of Cambridge Repository |
institution |
Open Polar |
collection |
Apollo - University of Cambridge Repository |
op_collection_id |
ftunivcam |
language |
English |
topic |
giant magnetofossils biogenic magnetite Palaeocene-Eocene Thermal Maximum biomineralization electron microscopy |
spellingShingle |
giant magnetofossils biogenic magnetite Palaeocene-Eocene Thermal Maximum biomineralization electron microscopy Xue, P Chang, L Pei, Z Harrison, RJ Discovery of giant magnetofossils within and outside of the Palaeocene-Eocene Thermal Maximum in the North Atlantic |
topic_facet |
giant magnetofossils biogenic magnetite Palaeocene-Eocene Thermal Maximum biomineralization electron microscopy |
description |
Giant magnetofossils have exceptionally large grain sizes and peculiar morphologies compared to conventional biogenic magnetite nanoparticles. The origin of these unusual magnetic crystals is a mystery because there are no known modern analogues. Giant magnetofossils have so far been identified in marine sediments deposited during past warming periods, leading to the assumption that these fossils were uniquely tied to ancient hyperthermal events. Here we describe the occurrence of abundant giant magnetofossils within North Atlantic pelagic sediments from International Ocean Discovery Program (IODP) Sites U1403 and U1409 at distinct palaeodepths not only during the Palaeocene-Eocene Thermal Maximum (PETM; ~56 Ma) intervals but also far before (>700 ky earlier than the PEB, Palaeocene-Eocene boundary) and after (>300 ky later than the PEB) the PETM, and in a sample of ~70 Ma age. Our results indicate that giant biogenic magnetite crystals were not uniquely produced during ancient hyperthermal events. Magnetic domain states of giant magnetite particles are investigated using dimensional analysis and micromagnetic simulations. Morphological, compositional, and crystallographic data point towards a potential biogenic origin of those unusual crystals. National Natural Science Foundation of China (NSFC grants 41974074, 42061130214, 41574060). Royal Society-Newton Advanced Fellowship (grant NAF\R1\201096). |
format |
Article in Journal/Newspaper |
author |
Xue, P Chang, L Pei, Z Harrison, RJ |
author_facet |
Xue, P Chang, L Pei, Z Harrison, RJ |
author_sort |
Xue, P |
title |
Discovery of giant magnetofossils within and outside of the Palaeocene-Eocene Thermal Maximum in the North Atlantic |
title_short |
Discovery of giant magnetofossils within and outside of the Palaeocene-Eocene Thermal Maximum in the North Atlantic |
title_full |
Discovery of giant magnetofossils within and outside of the Palaeocene-Eocene Thermal Maximum in the North Atlantic |
title_fullStr |
Discovery of giant magnetofossils within and outside of the Palaeocene-Eocene Thermal Maximum in the North Atlantic |
title_full_unstemmed |
Discovery of giant magnetofossils within and outside of the Palaeocene-Eocene Thermal Maximum in the North Atlantic |
title_sort |
discovery of giant magnetofossils within and outside of the palaeocene-eocene thermal maximum in the north atlantic |
publisher |
Elsevier BV |
publishDate |
2022 |
url |
https://www.repository.cam.ac.uk/handle/1810/333823 https://doi.org/10.17863/CAM.81243 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
https://www.repository.cam.ac.uk/handle/1810/333823 doi:10.17863/CAM.81243 |
op_rights |
Attribution-NonCommercial-NoDerivatives 4.0 International https://creativecommons.org/licenses/by-nc-nd/4.0/ |
op_doi |
https://doi.org/10.17863/CAM.81243 |
_version_ |
1788063370886250496 |