New geomagnetic paleosecular-variation results from the Old Crow Basin, Yukon Territory, and their use in stratigraphic correlation
A total of 626 fully orientated samples were collected from two laterally equivalent vertical sections (each approximately 20 m thick) in Pleistocene sediments exposed in riverbank outcrops on the Old Crow River, Yukon Territory. The paleomagnetic records recovered reveal a sequence of three feature...
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Language: | French |
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1989
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crcansciencepubl:10.1139/e89-213 2023-12-17T10:48:09+01:00 New geomagnetic paleosecular-variation results from the Old Crow Basin, Yukon Territory, and their use in stratigraphic correlation Gillen, K. P. Evans, M. E. 1989 http://dx.doi.org/10.1139/e89-213 http://www.nrcresearchpress.com/doi/pdf/10.1139/e89-213 fr fre Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 26, issue 12, page 2507-2511 ISSN 0008-4077 1480-3313 General Earth and Planetary Sciences journal-article 1989 crcansciencepubl https://doi.org/10.1139/e89-213 2023-11-19T13:38:15Z A total of 626 fully orientated samples were collected from two laterally equivalent vertical sections (each approximately 20 m thick) in Pleistocene sediments exposed in riverbank outcrops on the Old Crow River, Yukon Territory. The paleomagnetic records recovered reveal a sequence of three features correlatable with results obtained from previously sampled sections some 5 km upstream. This correlation, which is confirmed by magnetic-susceptibility measurements, allows the stratigraphic position of the Old Crow Tephra to be inferred, even though it does not actually occur at this locality; it also provides strong support for the reality of these paleosecular-variation signals. The most prominent of these take the form of repeating linear perturbations, which are here interpreted as evidence of stationary sources of reversely directed flux in the outer core. Such reverse-flux patches exist elsewhere in the modern field, but a simple magnetostatic model suggests that the paleosources were apparently an order of magnitude stronger. Article in Journal/Newspaper Old Crow Yukon Canadian Science Publishing (via Crossref) Yukon Crow River ENVELOPE(-125.395,-125.395,60.000,60.000) Old Crow River ENVELOPE(-139.803,-139.803,67.580,67.580) Canadian Journal of Earth Sciences 26 12 2507 2511 |
institution |
Open Polar |
collection |
Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
French |
topic |
General Earth and Planetary Sciences |
spellingShingle |
General Earth and Planetary Sciences Gillen, K. P. Evans, M. E. New geomagnetic paleosecular-variation results from the Old Crow Basin, Yukon Territory, and their use in stratigraphic correlation |
topic_facet |
General Earth and Planetary Sciences |
description |
A total of 626 fully orientated samples were collected from two laterally equivalent vertical sections (each approximately 20 m thick) in Pleistocene sediments exposed in riverbank outcrops on the Old Crow River, Yukon Territory. The paleomagnetic records recovered reveal a sequence of three features correlatable with results obtained from previously sampled sections some 5 km upstream. This correlation, which is confirmed by magnetic-susceptibility measurements, allows the stratigraphic position of the Old Crow Tephra to be inferred, even though it does not actually occur at this locality; it also provides strong support for the reality of these paleosecular-variation signals. The most prominent of these take the form of repeating linear perturbations, which are here interpreted as evidence of stationary sources of reversely directed flux in the outer core. Such reverse-flux patches exist elsewhere in the modern field, but a simple magnetostatic model suggests that the paleosources were apparently an order of magnitude stronger. |
format |
Article in Journal/Newspaper |
author |
Gillen, K. P. Evans, M. E. |
author_facet |
Gillen, K. P. Evans, M. E. |
author_sort |
Gillen, K. P. |
title |
New geomagnetic paleosecular-variation results from the Old Crow Basin, Yukon Territory, and their use in stratigraphic correlation |
title_short |
New geomagnetic paleosecular-variation results from the Old Crow Basin, Yukon Territory, and their use in stratigraphic correlation |
title_full |
New geomagnetic paleosecular-variation results from the Old Crow Basin, Yukon Territory, and their use in stratigraphic correlation |
title_fullStr |
New geomagnetic paleosecular-variation results from the Old Crow Basin, Yukon Territory, and their use in stratigraphic correlation |
title_full_unstemmed |
New geomagnetic paleosecular-variation results from the Old Crow Basin, Yukon Territory, and their use in stratigraphic correlation |
title_sort |
new geomagnetic paleosecular-variation results from the old crow basin, yukon territory, and their use in stratigraphic correlation |
publisher |
Canadian Science Publishing |
publishDate |
1989 |
url |
http://dx.doi.org/10.1139/e89-213 http://www.nrcresearchpress.com/doi/pdf/10.1139/e89-213 |
long_lat |
ENVELOPE(-125.395,-125.395,60.000,60.000) ENVELOPE(-139.803,-139.803,67.580,67.580) |
geographic |
Yukon Crow River Old Crow River |
geographic_facet |
Yukon Crow River Old Crow River |
genre |
Old Crow Yukon |
genre_facet |
Old Crow Yukon |
op_source |
Canadian Journal of Earth Sciences volume 26, issue 12, page 2507-2511 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e89-213 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
26 |
container_issue |
12 |
container_start_page |
2507 |
op_container_end_page |
2511 |
_version_ |
1785572248275386368 |