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...
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ftdoajarticles:oai:doaj.org/article:e665f8be11d04d4d9a72eeb00004a64a 2023-05-15T14:43:21+02:00 The Arctic Ocean Manganese Cycle, an Overlooked Mechanism in the Anomalous Palaeomagnetic Sedimentary Record Steffen Wiers Ian Snowball Matt O’Regan Christof Pearce Bjarne Almqvist 2020-03-01T00:00:00Z https://doi.org/10.3389/feart.2020.00075 https://doaj.org/article/e665f8be11d04d4d9a72eeb00004a64a EN eng Frontiers Media S.A. https://www.frontiersin.org/article/10.3389/feart.2020.00075/full https://doaj.org/toc/2296-6463 2296-6463 doi:10.3389/feart.2020.00075 https://doaj.org/article/e665f8be11d04d4d9a72eeb00004a64a Frontiers in Earth Science, Vol 8 (2020) Arctic Ocean lithostratigraphy palaeomagnetism mineral magnetism diagenesis Science Q article 2020 ftdoajarticles https://doi.org/10.3389/feart.2020.00075 2022-12-30T23:30:39Z 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 Directory of Open Access Journals: DOAJ Articles Arctic Arctic Ocean East Siberian Shelf ENVELOPE(-162.267,-162.267,74.400,74.400) Yermak Plateau ENVELOPE(5.000,5.000,81.250,81.250) Frontiers in Earth Science 8 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Arctic Ocean lithostratigraphy palaeomagnetism mineral magnetism diagenesis Science Q |
spellingShingle |
Arctic Ocean lithostratigraphy palaeomagnetism mineral magnetism diagenesis Science Q Steffen Wiers Ian Snowball Matt O’Regan Christof Pearce Bjarne Almqvist The Arctic Ocean Manganese Cycle, an Overlooked Mechanism in the Anomalous Palaeomagnetic Sedimentary Record |
topic_facet |
Arctic Ocean lithostratigraphy palaeomagnetism mineral magnetism diagenesis Science Q |
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 |
Steffen Wiers Ian Snowball Matt O’Regan Christof Pearce Bjarne Almqvist |
author_facet |
Steffen Wiers Ian Snowball Matt O’Regan Christof Pearce Bjarne Almqvist |
author_sort |
Steffen Wiers |
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 |
Frontiers Media S.A. |
publishDate |
2020 |
url |
https://doi.org/10.3389/feart.2020.00075 https://doaj.org/article/e665f8be11d04d4d9a72eeb00004a64a |
long_lat |
ENVELOPE(-162.267,-162.267,74.400,74.400) ENVELOPE(5.000,5.000,81.250,81.250) |
geographic |
Arctic Arctic Ocean East Siberian Shelf Yermak Plateau |
geographic_facet |
Arctic Arctic Ocean East Siberian Shelf Yermak Plateau |
genre |
Arctic Arctic Ocean Lomonosov Ridge Yermak plateau |
genre_facet |
Arctic Arctic Ocean Lomonosov Ridge Yermak plateau |
op_source |
Frontiers in Earth Science, Vol 8 (2020) |
op_relation |
https://www.frontiersin.org/article/10.3389/feart.2020.00075/full https://doaj.org/toc/2296-6463 2296-6463 doi:10.3389/feart.2020.00075 https://doaj.org/article/e665f8be11d04d4d9a72eeb00004a64a |
op_doi |
https://doi.org/10.3389/feart.2020.00075 |
container_title |
Frontiers in Earth Science |
container_volume |
8 |
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1766315016629256192 |