Seven thousand year duration for a geomagnetic excursion constrained by Th-230(xs)
The duration of geomagnetic excursions may provide important information about the geodynamo. It has proven difficult, however, to assess the exact duration of both excursions and reversals. We combine high-resolution paleomagnetic records from marine sediments with measurements of the 230Thxs flux...
Published in: | Geophysical Research Letters |
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Online Access: | https://doi.org/10.1029/2007GL031090 https://ora.ox.ac.uk/objects/uuid:cea2c97f-8e28-42c8-b0bb-f48e3e5a5b9b |
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ftuloxford:oai:ora.ox.ac.uk:uuid:cea2c97f-8e28-42c8-b0bb-f48e3e5a5b9b 2023-05-15T16:48:56+02:00 Seven thousand year duration for a geomagnetic excursion constrained by Th-230(xs) Knudsen, M Henderson, G Niocaill, C West, A 2016-07-29 https://doi.org/10.1029/2007GL031090 https://ora.ox.ac.uk/objects/uuid:cea2c97f-8e28-42c8-b0bb-f48e3e5a5b9b unknown doi:10.1029/2007GL031090 https://ora.ox.ac.uk/objects/uuid:cea2c97f-8e28-42c8-b0bb-f48e3e5a5b9b https://doi.org/10.1029/2007GL031090 info:eu-repo/semantics/embargoedAccess Journal article 2016 ftuloxford https://doi.org/10.1029/2007GL031090 2022-06-28T20:24:19Z The duration of geomagnetic excursions may provide important information about the geodynamo. It has proven difficult, however, to assess the exact duration of both excursions and reversals. We combine high-resolution paleomagnetic records from marine sediments with measurements of the 230Thxs flux to the seafloor in order to better constrain the duration of the Iceland Basin Excursion (IBE). We final the duration of the IBE to be ∼7-8 kyr, implying that it is considerably longer than previous estimates for the Laschamp Excursion (∼2 kyr), and more similar in duration to that of full polarity reversals. There may not be, therefore, a characteristic timescale for transitional field configurations that distinguishes excursions from reversals. Copyright 2007 by the American Geophysical Union. Article in Journal/Newspaper Iceland ORA - Oxford University Research Archive Geophysical Research Letters 34 22 |
institution |
Open Polar |
collection |
ORA - Oxford University Research Archive |
op_collection_id |
ftuloxford |
language |
unknown |
description |
The duration of geomagnetic excursions may provide important information about the geodynamo. It has proven difficult, however, to assess the exact duration of both excursions and reversals. We combine high-resolution paleomagnetic records from marine sediments with measurements of the 230Thxs flux to the seafloor in order to better constrain the duration of the Iceland Basin Excursion (IBE). We final the duration of the IBE to be ∼7-8 kyr, implying that it is considerably longer than previous estimates for the Laschamp Excursion (∼2 kyr), and more similar in duration to that of full polarity reversals. There may not be, therefore, a characteristic timescale for transitional field configurations that distinguishes excursions from reversals. Copyright 2007 by the American Geophysical Union. |
format |
Article in Journal/Newspaper |
author |
Knudsen, M Henderson, G Niocaill, C West, A |
spellingShingle |
Knudsen, M Henderson, G Niocaill, C West, A Seven thousand year duration for a geomagnetic excursion constrained by Th-230(xs) |
author_facet |
Knudsen, M Henderson, G Niocaill, C West, A |
author_sort |
Knudsen, M |
title |
Seven thousand year duration for a geomagnetic excursion constrained by Th-230(xs) |
title_short |
Seven thousand year duration for a geomagnetic excursion constrained by Th-230(xs) |
title_full |
Seven thousand year duration for a geomagnetic excursion constrained by Th-230(xs) |
title_fullStr |
Seven thousand year duration for a geomagnetic excursion constrained by Th-230(xs) |
title_full_unstemmed |
Seven thousand year duration for a geomagnetic excursion constrained by Th-230(xs) |
title_sort |
seven thousand year duration for a geomagnetic excursion constrained by th-230(xs) |
publishDate |
2016 |
url |
https://doi.org/10.1029/2007GL031090 https://ora.ox.ac.uk/objects/uuid:cea2c97f-8e28-42c8-b0bb-f48e3e5a5b9b |
genre |
Iceland |
genre_facet |
Iceland |
op_relation |
doi:10.1029/2007GL031090 https://ora.ox.ac.uk/objects/uuid:cea2c97f-8e28-42c8-b0bb-f48e3e5a5b9b https://doi.org/10.1029/2007GL031090 |
op_rights |
info:eu-repo/semantics/embargoedAccess |
op_doi |
https://doi.org/10.1029/2007GL031090 |
container_title |
Geophysical Research Letters |
container_volume |
34 |
container_issue |
22 |
_version_ |
1766039008838680576 |