The Arctic Ocean Manganese Cycle, an Overlooked Mechanism in the Anomalous Palaeomagnetic Sedimentary Record
Palaeomagnetic records obtained from Arctic Ocean sediments are controversial because they include numerous and anomalous geomagnetic excursions. Age models that do not rely on palaeomagnetic interpretations reveal that the majority of the changes in inclination do not concur with the established gl...
Published in: | Frontiers in Earth Science |
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Uppsala universitet, Naturresurser och hållbar utveckling
2020
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Online Access: | http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-408181 https://doi.org/10.3389/feart.2020.00075 |
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ftuppsalauniv:oai:DiVA.org:uu-408181 2023-09-26T15:13:55+02:00 The Arctic Ocean Manganese Cycle, an Overlooked Mechanism in the Anomalous Palaeomagnetic Sedimentary Record Wiers, Steffen Snowball, Ian O'Regan, Matt Pearce, Christof Almqvist, Bjarne 2020 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-408181 https://doi.org/10.3389/feart.2020.00075 eng eng Uppsala universitet, Naturresurser och hållbar utveckling Uppsala universitet, Geofysik Department of Geological Sciences, Stockholm University, Stockholm, Sweden Department of Geoscience and Arctic Research Centre, Aarhus University, Aarhus, Denmark Frontiers in Earth Science, 2020, 8, orcid:0000-0002-3564-6747 orcid:0000-0002-6257-3088 orcid:0000-0002-6046-1488 orcid:0000-0002-4866-3204 orcid:0000-0002-9385-7614 http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-408181 doi:10.3389/feart.2020.00075 ISI:000525716000001 info:eu-repo/semantics/openAccess Earth and Related Environmental Sciences Geovetenskap och miljövetenskap Article in journal info:eu-repo/semantics/article text 2020 ftuppsalauniv https://doi.org/10.3389/feart.2020.00075 2023-08-30T22:32:04Z Palaeomagnetic records obtained from Arctic Ocean sediments are controversial because they include numerous and anomalous geomagnetic excursions. Age models that do not rely on palaeomagnetic interpretations reveal that the majority of the changes in inclination do not concur with the established global magnetostratigraphy. Seafloor oxidation of (titano)magnetite to (titano)maghemite with self-reversal of the (titano)maghemite coatings has been proposed as an explanation. However, no existing model can explain when the self-reversed components formed and how they are linked to litho-stratigraphic changes in Arctic Ocean sediments. In this study, we present new palaeo- and rock magnetic measurements of a sediment core recovered from the Arlis Plateau, close to the East Siberian Shelf. The magnetic data set is evaluated in the context of the regional stratigraphy and downcore changes in physical and chemical properties. By cross-core correlation, we show that magnetic inclination changes in the region do not stratigraphically align, similar to results of studies of sediments from the Lomonosov Ridge and Yermak Plateau. Rock magnetic and chemical parameters indicate post-depositional diagenetic changes in the magnetic mineral assemblage that can be linked to manganese cycling in the Arctic Ocean. The potential presence of a magnetic remanence bearing manganese-iron oxide phase, which can undergo self-reversal, leads to an alternative hypothesis to primary seafloor oxidation of (titano)magnetite. This phase may form by precipitation from seawater or by changing redox conditions in the sediment column by mineral precipitation from ions dissolved in pore water. These findings highlight the need for further investigation into the magnetic mineral assemblage, its link to manganese cycling and pore water geochemistry in Arctic Ocean sediments. Article in Journal/Newspaper Arctic Arctic Ocean Lomonosov Ridge Yermak plateau Uppsala University: Publications (DiVA) Arctic Arctic Ocean Yermak Plateau ENVELOPE(5.000,5.000,81.250,81.250) East Siberian Shelf ENVELOPE(-162.267,-162.267,74.400,74.400) Frontiers in Earth Science 8 |
institution |
Open Polar |
collection |
Uppsala University: Publications (DiVA) |
op_collection_id |
ftuppsalauniv |
language |
English |
topic |
Earth and Related Environmental Sciences Geovetenskap och miljövetenskap |
spellingShingle |
Earth and Related Environmental Sciences Geovetenskap och miljövetenskap Wiers, Steffen Snowball, Ian O'Regan, Matt Pearce, Christof Almqvist, Bjarne The Arctic Ocean Manganese Cycle, an Overlooked Mechanism in the Anomalous Palaeomagnetic Sedimentary Record |
topic_facet |
Earth and Related Environmental Sciences Geovetenskap och miljövetenskap |
description |
Palaeomagnetic records obtained from Arctic Ocean sediments are controversial because they include numerous and anomalous geomagnetic excursions. Age models that do not rely on palaeomagnetic interpretations reveal that the majority of the changes in inclination do not concur with the established global magnetostratigraphy. Seafloor oxidation of (titano)magnetite to (titano)maghemite with self-reversal of the (titano)maghemite coatings has been proposed as an explanation. However, no existing model can explain when the self-reversed components formed and how they are linked to litho-stratigraphic changes in Arctic Ocean sediments. In this study, we present new palaeo- and rock magnetic measurements of a sediment core recovered from the Arlis Plateau, close to the East Siberian Shelf. The magnetic data set is evaluated in the context of the regional stratigraphy and downcore changes in physical and chemical properties. By cross-core correlation, we show that magnetic inclination changes in the region do not stratigraphically align, similar to results of studies of sediments from the Lomonosov Ridge and Yermak Plateau. Rock magnetic and chemical parameters indicate post-depositional diagenetic changes in the magnetic mineral assemblage that can be linked to manganese cycling in the Arctic Ocean. The potential presence of a magnetic remanence bearing manganese-iron oxide phase, which can undergo self-reversal, leads to an alternative hypothesis to primary seafloor oxidation of (titano)magnetite. This phase may form by precipitation from seawater or by changing redox conditions in the sediment column by mineral precipitation from ions dissolved in pore water. These findings highlight the need for further investigation into the magnetic mineral assemblage, its link to manganese cycling and pore water geochemistry in Arctic Ocean sediments. |
format |
Article in Journal/Newspaper |
author |
Wiers, Steffen Snowball, Ian O'Regan, Matt Pearce, Christof Almqvist, Bjarne |
author_facet |
Wiers, Steffen Snowball, Ian O'Regan, Matt Pearce, Christof Almqvist, Bjarne |
author_sort |
Wiers, Steffen |
title |
The Arctic Ocean Manganese Cycle, an Overlooked Mechanism in the Anomalous Palaeomagnetic Sedimentary Record |
title_short |
The Arctic Ocean Manganese Cycle, an Overlooked Mechanism in the Anomalous Palaeomagnetic Sedimentary Record |
title_full |
The Arctic Ocean Manganese Cycle, an Overlooked Mechanism in the Anomalous Palaeomagnetic Sedimentary Record |
title_fullStr |
The Arctic Ocean Manganese Cycle, an Overlooked Mechanism in the Anomalous Palaeomagnetic Sedimentary Record |
title_full_unstemmed |
The Arctic Ocean Manganese Cycle, an Overlooked Mechanism in the Anomalous Palaeomagnetic Sedimentary Record |
title_sort |
arctic ocean manganese cycle, an overlooked mechanism in the anomalous palaeomagnetic sedimentary record |
publisher |
Uppsala universitet, Naturresurser och hållbar utveckling |
publishDate |
2020 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-408181 https://doi.org/10.3389/feart.2020.00075 |
long_lat |
ENVELOPE(5.000,5.000,81.250,81.250) ENVELOPE(-162.267,-162.267,74.400,74.400) |
geographic |
Arctic Arctic Ocean Yermak Plateau East Siberian Shelf |
geographic_facet |
Arctic Arctic Ocean Yermak Plateau East Siberian Shelf |
genre |
Arctic Arctic Ocean Lomonosov Ridge Yermak plateau |
genre_facet |
Arctic Arctic Ocean Lomonosov Ridge Yermak plateau |
op_relation |
Frontiers in Earth Science, 2020, 8, orcid:0000-0002-3564-6747 orcid:0000-0002-6257-3088 orcid:0000-0002-6046-1488 orcid:0000-0002-4866-3204 orcid:0000-0002-9385-7614 http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-408181 doi:10.3389/feart.2020.00075 ISI:000525716000001 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.3389/feart.2020.00075 |
container_title |
Frontiers in Earth Science |
container_volume |
8 |
_version_ |
1778134605883244544 |