Paleointensity Confirms cm-scale Sedimentation Rates and Suggests Intervals with Non-uniform Deposition on the Lomonosov Ridge, Central Arctic Ocean
Chronologies of Arctic Ocean Plio-Pleistocene sediments have been mainly based on paleomagnetic reversal stratigraphy due to low microfossil-content that precludes biostratigraphic dating methods and establishment of an oxygen isotope stratigraphy. Paleomagnetic reversal records primarily from Canad...
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ftuninhampshire:oai:scholars.unh.edu:ccom-1559 2023-05-15T14:53:01+02:00 Paleointensity Confirms cm-scale Sedimentation Rates and Suggests Intervals with Non-uniform Deposition on the Lomonosov Ridge, Central Arctic Ocean Lovlie, Reidar Jakobsson, Martin Backman, Jan 2002-12-01T08:00:00Z https://scholars.unh.edu/ccom/559 http://abstractsearch.agu.org/meetings/2002/FM/GP71A-0973.html unknown University of New Hampshire Scholars' Repository https://scholars.unh.edu/ccom/559 http://abstractsearch.agu.org/meetings/2002/FM/GP71A-0973.html Center for Coastal and Ocean Mapping Oceanography and Atmospheric Sciences and Meteorology text 2002 ftuninhampshire 2023-01-30T21:32:51Z Chronologies of Arctic Ocean Plio-Pleistocene sediments have been mainly based on paleomagnetic reversal stratigraphy due to low microfossil-content that precludes biostratigraphic dating methods and establishment of an oxygen isotope stratigraphy. Paleomagnetic reversal records primarily from Canadian Basin sediment cores, but also from other Arctic Ocean cores, were initially interpreted as polarity reversals (chron/sub-chron) because paleomagnetic excursions have not until recently been accepted as expressions of genuine geomagnetic features. A Geomagnetic Excursion Time Scale (GETS) has not yet been established and, therefore, the use of excursions as a dating tool is largely dependent on external time control. A number of cores from different regions of the Arctic Ocean have recently been dated interpreting short polarity reversal intervals as geomagnetic excursions. Some of these data reveal narrow intervals with complex patterns of short normal/reversed zones and also absence of excursions at 'expected' depths. Although these observations may be attributed to the short duration of geomagnetic excursions, intermittent bioturbation (?) or other erasing processes, they clearly demonstrate the need for an independent dating control confirming uniformity of accumulation. Paleointensity-records could convey reliable data for relatively high-resolution dating that may disclose variations in rate and uniformity of sedimentation. We present paleointensity records from cores from the Lomonosov Ridge with cm-scale sedimentation rates that carry records of inferred excursions. One of the cores has been dated correlating MnO enriched brown colored layers with interglacial cycles, biostratigraphic marker horizons and excursions (Jakobsson et al, 20001). The absence of excursions in the upper parts of the cores remains unaccounted for. Paleointensity records are correlated with SINT-800, revealing a good correspondence back to ca 250 ka. Below this level correlation becomes blurred. Depth-age plots show two linear ... Text Arctic Arctic Ocean Lomonosov Ridge University of New Hampshire: Scholars Repository Arctic Arctic Ocean |
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Open Polar |
collection |
University of New Hampshire: Scholars Repository |
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ftuninhampshire |
language |
unknown |
topic |
Oceanography and Atmospheric Sciences and Meteorology |
spellingShingle |
Oceanography and Atmospheric Sciences and Meteorology Lovlie, Reidar Jakobsson, Martin Backman, Jan Paleointensity Confirms cm-scale Sedimentation Rates and Suggests Intervals with Non-uniform Deposition on the Lomonosov Ridge, Central Arctic Ocean |
topic_facet |
Oceanography and Atmospheric Sciences and Meteorology |
description |
Chronologies of Arctic Ocean Plio-Pleistocene sediments have been mainly based on paleomagnetic reversal stratigraphy due to low microfossil-content that precludes biostratigraphic dating methods and establishment of an oxygen isotope stratigraphy. Paleomagnetic reversal records primarily from Canadian Basin sediment cores, but also from other Arctic Ocean cores, were initially interpreted as polarity reversals (chron/sub-chron) because paleomagnetic excursions have not until recently been accepted as expressions of genuine geomagnetic features. A Geomagnetic Excursion Time Scale (GETS) has not yet been established and, therefore, the use of excursions as a dating tool is largely dependent on external time control. A number of cores from different regions of the Arctic Ocean have recently been dated interpreting short polarity reversal intervals as geomagnetic excursions. Some of these data reveal narrow intervals with complex patterns of short normal/reversed zones and also absence of excursions at 'expected' depths. Although these observations may be attributed to the short duration of geomagnetic excursions, intermittent bioturbation (?) or other erasing processes, they clearly demonstrate the need for an independent dating control confirming uniformity of accumulation. Paleointensity-records could convey reliable data for relatively high-resolution dating that may disclose variations in rate and uniformity of sedimentation. We present paleointensity records from cores from the Lomonosov Ridge with cm-scale sedimentation rates that carry records of inferred excursions. One of the cores has been dated correlating MnO enriched brown colored layers with interglacial cycles, biostratigraphic marker horizons and excursions (Jakobsson et al, 20001). The absence of excursions in the upper parts of the cores remains unaccounted for. Paleointensity records are correlated with SINT-800, revealing a good correspondence back to ca 250 ka. Below this level correlation becomes blurred. Depth-age plots show two linear ... |
format |
Text |
author |
Lovlie, Reidar Jakobsson, Martin Backman, Jan |
author_facet |
Lovlie, Reidar Jakobsson, Martin Backman, Jan |
author_sort |
Lovlie, Reidar |
title |
Paleointensity Confirms cm-scale Sedimentation Rates and Suggests Intervals with Non-uniform Deposition on the Lomonosov Ridge, Central Arctic Ocean |
title_short |
Paleointensity Confirms cm-scale Sedimentation Rates and Suggests Intervals with Non-uniform Deposition on the Lomonosov Ridge, Central Arctic Ocean |
title_full |
Paleointensity Confirms cm-scale Sedimentation Rates and Suggests Intervals with Non-uniform Deposition on the Lomonosov Ridge, Central Arctic Ocean |
title_fullStr |
Paleointensity Confirms cm-scale Sedimentation Rates and Suggests Intervals with Non-uniform Deposition on the Lomonosov Ridge, Central Arctic Ocean |
title_full_unstemmed |
Paleointensity Confirms cm-scale Sedimentation Rates and Suggests Intervals with Non-uniform Deposition on the Lomonosov Ridge, Central Arctic Ocean |
title_sort |
paleointensity confirms cm-scale sedimentation rates and suggests intervals with non-uniform deposition on the lomonosov ridge, central arctic ocean |
publisher |
University of New Hampshire Scholars' Repository |
publishDate |
2002 |
url |
https://scholars.unh.edu/ccom/559 http://abstractsearch.agu.org/meetings/2002/FM/GP71A-0973.html |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Ocean Lomonosov Ridge |
genre_facet |
Arctic Arctic Ocean Lomonosov Ridge |
op_source |
Center for Coastal and Ocean Mapping |
op_relation |
https://scholars.unh.edu/ccom/559 http://abstractsearch.agu.org/meetings/2002/FM/GP71A-0973.html |
_version_ |
1766324429238829056 |