Paleomagnetic evidence for multiple Late Pliocene - Early Pleistocene glaciations in the Klondike area, Yukon Territory
The Late Pliocene - Early Pleistocene terraces of the Klondike area provide a conformal record of sedimentation which marks the transition from preglacial to glacial conditions, and is one of the most complete records of glaciation and interglaciation in the northern Cordillera. Preglacial sedimenta...
Published in: | Canadian Journal of Earth Sciences |
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Online Access: | http://dx.doi.org/10.1139/e00-014 http://www.nrcresearchpress.com/doi/pdf/10.1139/e00-014 |
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crcansciencepubl:10.1139/e00-014 2024-10-20T14:09:29+00:00 Paleomagnetic evidence for multiple Late Pliocene - Early Pleistocene glaciations in the Klondike area, Yukon Territory Froese, D G Barendregt, R W Enkin, R J Baker, J 2000 http://dx.doi.org/10.1139/e00-014 http://www.nrcresearchpress.com/doi/pdf/10.1139/e00-014 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 37, issue 6, page 863-877 ISSN 0008-4077 1480-3313 journal-article 2000 crcansciencepubl https://doi.org/10.1139/e00-014 2024-09-27T04:07:25Z The Late Pliocene - Early Pleistocene terraces of the Klondike area provide a conformal record of sedimentation which marks the transition from preglacial to glacial conditions, and is one of the most complete records of glaciation and interglaciation in the northern Cordillera. Preglacial sedimentation is recorded in the Lower White Channel gravel that contains a reverse-normal polarity sequence. A re-aggradation of the nonglaciated valleys of the goldfields in response to Late Pliocene cooling is recorded by the Upper White Channel gravel, which is characterized by a dominant normal polarity with a lower reversal likely associated with the first ice-wedge casts. Klondike gravel interfingers with Upper White Channel and is normally magnetized, indicating an equivalent magnetostratigraphic unit. This glaciofluvial gravel provides evidence of extra-basinal clasts, marking a major reorganization of drainage associated with the first advance of the Cordilleran Ice Sheet in western Yukon Territory correlated with the Gauss chron (>2.58 Ma). An intermediate terrace in Klondike valley is overlain by 8 m of fluvial and glaciofluvial gravel named the Midnight Dome gravel. This gravel is mantled by 15 m of loess and hillslope deposits, named the Midnight Dome loess, which preserve at least three interglacial pollen assemblages, and a reverse-normal-reverse-normal polarity sequence assigned to the late Matuyama chron, including Jaramillo subchron (1.07-0.99 Ma), and early Brunhes chron (<0.78 Ma). The oldest glaciations here, based on the preferred interpretation, extend well into the Pliocene (>2.58 Ma) making these among the oldest glacial sediments in North America. Article in Journal/Newspaper Ice Sheet Yukon Canadian Science Publishing Yukon Goldfields ENVELOPE(-108.485,-108.485,59.467,59.467) Midnight Dome ENVELOPE(-139.393,-139.393,64.072,64.072) Canadian Journal of Earth Sciences 37 6 863 877 |
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Open Polar |
collection |
Canadian Science Publishing |
op_collection_id |
crcansciencepubl |
language |
English |
description |
The Late Pliocene - Early Pleistocene terraces of the Klondike area provide a conformal record of sedimentation which marks the transition from preglacial to glacial conditions, and is one of the most complete records of glaciation and interglaciation in the northern Cordillera. Preglacial sedimentation is recorded in the Lower White Channel gravel that contains a reverse-normal polarity sequence. A re-aggradation of the nonglaciated valleys of the goldfields in response to Late Pliocene cooling is recorded by the Upper White Channel gravel, which is characterized by a dominant normal polarity with a lower reversal likely associated with the first ice-wedge casts. Klondike gravel interfingers with Upper White Channel and is normally magnetized, indicating an equivalent magnetostratigraphic unit. This glaciofluvial gravel provides evidence of extra-basinal clasts, marking a major reorganization of drainage associated with the first advance of the Cordilleran Ice Sheet in western Yukon Territory correlated with the Gauss chron (>2.58 Ma). An intermediate terrace in Klondike valley is overlain by 8 m of fluvial and glaciofluvial gravel named the Midnight Dome gravel. This gravel is mantled by 15 m of loess and hillslope deposits, named the Midnight Dome loess, which preserve at least three interglacial pollen assemblages, and a reverse-normal-reverse-normal polarity sequence assigned to the late Matuyama chron, including Jaramillo subchron (1.07-0.99 Ma), and early Brunhes chron (<0.78 Ma). The oldest glaciations here, based on the preferred interpretation, extend well into the Pliocene (>2.58 Ma) making these among the oldest glacial sediments in North America. |
format |
Article in Journal/Newspaper |
author |
Froese, D G Barendregt, R W Enkin, R J Baker, J |
spellingShingle |
Froese, D G Barendregt, R W Enkin, R J Baker, J Paleomagnetic evidence for multiple Late Pliocene - Early Pleistocene glaciations in the Klondike area, Yukon Territory |
author_facet |
Froese, D G Barendregt, R W Enkin, R J Baker, J |
author_sort |
Froese, D G |
title |
Paleomagnetic evidence for multiple Late Pliocene - Early Pleistocene glaciations in the Klondike area, Yukon Territory |
title_short |
Paleomagnetic evidence for multiple Late Pliocene - Early Pleistocene glaciations in the Klondike area, Yukon Territory |
title_full |
Paleomagnetic evidence for multiple Late Pliocene - Early Pleistocene glaciations in the Klondike area, Yukon Territory |
title_fullStr |
Paleomagnetic evidence for multiple Late Pliocene - Early Pleistocene glaciations in the Klondike area, Yukon Territory |
title_full_unstemmed |
Paleomagnetic evidence for multiple Late Pliocene - Early Pleistocene glaciations in the Klondike area, Yukon Territory |
title_sort |
paleomagnetic evidence for multiple late pliocene - early pleistocene glaciations in the klondike area, yukon territory |
publisher |
Canadian Science Publishing |
publishDate |
2000 |
url |
http://dx.doi.org/10.1139/e00-014 http://www.nrcresearchpress.com/doi/pdf/10.1139/e00-014 |
long_lat |
ENVELOPE(-108.485,-108.485,59.467,59.467) ENVELOPE(-139.393,-139.393,64.072,64.072) |
geographic |
Yukon Goldfields Midnight Dome |
geographic_facet |
Yukon Goldfields Midnight Dome |
genre |
Ice Sheet Yukon |
genre_facet |
Ice Sheet Yukon |
op_source |
Canadian Journal of Earth Sciences volume 37, issue 6, page 863-877 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e00-014 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
37 |
container_issue |
6 |
container_start_page |
863 |
op_container_end_page |
877 |
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1813449015193239552 |