High-resolution evidence for dynamic transitional geomagnetic field behaviour from a Miocene reversal, McMurdo Sound, Ross Sea, Antarctica
Abstract We report a high-resolution record of a Miocene polarity transition (probably the Chron C6r-C6n transition) from glacimarine sediments in McMurdo Sound, Ross Sea, Antarctica, which is the first transition record reported from high southern latitudes. The transition is recorded in two parall...
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Online Access: | http://dx.doi.org/10.1186/bf03352744 https://link.springer.com/content/pdf/10.1186/BF03352744.pdf https://link.springer.com/article/10.1186/BF03352744/fulltext.html http://link.springer.com/content/pdf/10.1186/BF03352744 |
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crspringernat:10.1186/bf03352744 2023-05-15T14:11:57+02:00 High-resolution evidence for dynamic transitional geomagnetic field behaviour from a Miocene reversal, McMurdo Sound, Ross Sea, Antarctica Roberts, Andrew P. Bakrania, Anisch Florindo, Fabio Rowan, Christopher J. Fielding, Christopher R. Powell, Ross D. 2007 http://dx.doi.org/10.1186/bf03352744 https://link.springer.com/content/pdf/10.1186/BF03352744.pdf https://link.springer.com/article/10.1186/BF03352744/fulltext.html http://link.springer.com/content/pdf/10.1186/BF03352744 en eng Springer Science and Business Media LLC https://creativecommons.org/licenses/by/4.0/ https://creativecommons.org/licenses/by/4.0/ CC-BY Earth, Planets and Space volume 59, issue 7, page 815-824 ISSN 1880-5981 Space and Planetary Science Geology journal-article 2007 crspringernat https://doi.org/10.1186/bf03352744 2022-01-04T09:25:47Z Abstract We report a high-resolution record of a Miocene polarity transition (probably the Chron C6r-C6n transition) from glacimarine sediments in McMurdo Sound, Ross Sea, Antarctica, which is the first transition record reported from high southern latitudes. The transition is recorded in two parallel cores through a 10.7 m stratigraphic thickness. The sediments are interpreted as having been deposited in a marine environment under the influence of floating ice or seaward of a glacier terminus from which a large sediment load was delivered to the drill site. The core was recovered using rotary drilling, which precludes azimuthal orientation of the core and determination of a vector record of the field during the transition. However, constraints on transitional field behaviour are provided by the exceptional resolution of this record. Large-scale paleomagnetic inclination fluctuations in the two cores can be independently correlated with each other using magnetic susceptibility data, which suggests that the sediments are reliable recorders of geomagnetic field variations. Agreement between the two parallel transition records provides evidence for highly dynamic field behaviour, as suggested by numerous large-scale inclination changes (∼90?) throughout the transition. These large-scale changes occur across stratigraphically narrow intervals, which is consistent with the suggestion of rapid field changes during transitions. In one intact portion of the core, where there is no apparent relative core rotation between samples, declinations and inclinations are consistent with the presence of a stable cluster of virtual geomagnetic poles within the transition (although the possibility that this cluster represents a rapid depositional event cannot be precluded). These observations are consistent with those from other high-resolution records and provide a rare detailed view of transitional field behaviour compared to most sedimentary records, which are not as thick and which appear to have been smoothed by sedimentary remanence acquisition processes. Article in Journal/Newspaper Antarc* Antarctica McMurdo Sound Ross Sea Springer Nature (via Crossref) McMurdo Sound Ross Sea Earth, Planets and Space 59 7 815 824 |
institution |
Open Polar |
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Springer Nature (via Crossref) |
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crspringernat |
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English |
topic |
Space and Planetary Science Geology |
spellingShingle |
Space and Planetary Science Geology Roberts, Andrew P. Bakrania, Anisch Florindo, Fabio Rowan, Christopher J. Fielding, Christopher R. Powell, Ross D. High-resolution evidence for dynamic transitional geomagnetic field behaviour from a Miocene reversal, McMurdo Sound, Ross Sea, Antarctica |
topic_facet |
Space and Planetary Science Geology |
description |
Abstract We report a high-resolution record of a Miocene polarity transition (probably the Chron C6r-C6n transition) from glacimarine sediments in McMurdo Sound, Ross Sea, Antarctica, which is the first transition record reported from high southern latitudes. The transition is recorded in two parallel cores through a 10.7 m stratigraphic thickness. The sediments are interpreted as having been deposited in a marine environment under the influence of floating ice or seaward of a glacier terminus from which a large sediment load was delivered to the drill site. The core was recovered using rotary drilling, which precludes azimuthal orientation of the core and determination of a vector record of the field during the transition. However, constraints on transitional field behaviour are provided by the exceptional resolution of this record. Large-scale paleomagnetic inclination fluctuations in the two cores can be independently correlated with each other using magnetic susceptibility data, which suggests that the sediments are reliable recorders of geomagnetic field variations. Agreement between the two parallel transition records provides evidence for highly dynamic field behaviour, as suggested by numerous large-scale inclination changes (∼90?) throughout the transition. These large-scale changes occur across stratigraphically narrow intervals, which is consistent with the suggestion of rapid field changes during transitions. In one intact portion of the core, where there is no apparent relative core rotation between samples, declinations and inclinations are consistent with the presence of a stable cluster of virtual geomagnetic poles within the transition (although the possibility that this cluster represents a rapid depositional event cannot be precluded). These observations are consistent with those from other high-resolution records and provide a rare detailed view of transitional field behaviour compared to most sedimentary records, which are not as thick and which appear to have been smoothed by sedimentary remanence acquisition processes. |
format |
Article in Journal/Newspaper |
author |
Roberts, Andrew P. Bakrania, Anisch Florindo, Fabio Rowan, Christopher J. Fielding, Christopher R. Powell, Ross D. |
author_facet |
Roberts, Andrew P. Bakrania, Anisch Florindo, Fabio Rowan, Christopher J. Fielding, Christopher R. Powell, Ross D. |
author_sort |
Roberts, Andrew P. |
title |
High-resolution evidence for dynamic transitional geomagnetic field behaviour from a Miocene reversal, McMurdo Sound, Ross Sea, Antarctica |
title_short |
High-resolution evidence for dynamic transitional geomagnetic field behaviour from a Miocene reversal, McMurdo Sound, Ross Sea, Antarctica |
title_full |
High-resolution evidence for dynamic transitional geomagnetic field behaviour from a Miocene reversal, McMurdo Sound, Ross Sea, Antarctica |
title_fullStr |
High-resolution evidence for dynamic transitional geomagnetic field behaviour from a Miocene reversal, McMurdo Sound, Ross Sea, Antarctica |
title_full_unstemmed |
High-resolution evidence for dynamic transitional geomagnetic field behaviour from a Miocene reversal, McMurdo Sound, Ross Sea, Antarctica |
title_sort |
high-resolution evidence for dynamic transitional geomagnetic field behaviour from a miocene reversal, mcmurdo sound, ross sea, antarctica |
publisher |
Springer Science and Business Media LLC |
publishDate |
2007 |
url |
http://dx.doi.org/10.1186/bf03352744 https://link.springer.com/content/pdf/10.1186/BF03352744.pdf https://link.springer.com/article/10.1186/BF03352744/fulltext.html http://link.springer.com/content/pdf/10.1186/BF03352744 |
geographic |
McMurdo Sound Ross Sea |
geographic_facet |
McMurdo Sound Ross Sea |
genre |
Antarc* Antarctica McMurdo Sound Ross Sea |
genre_facet |
Antarc* Antarctica McMurdo Sound Ross Sea |
op_source |
Earth, Planets and Space volume 59, issue 7, page 815-824 ISSN 1880-5981 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ https://creativecommons.org/licenses/by/4.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1186/bf03352744 |
container_title |
Earth, Planets and Space |
container_volume |
59 |
container_issue |
7 |
container_start_page |
815 |
op_container_end_page |
824 |
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1766284174284554240 |