The Great Preglacial “Bell River” of North America: Detrital Zircon Evidence for Oligocene–Miocene Fluvial Connections Between the Colorado Plateau and Labrador Sea
The idea of a great pre-glacial river that drained much of North America into the Arctic waters of modern Canada was first suggested in 1895 by Robert A. Bell. In the 1970s, petroleum exploration in Hudson Strait and the Labrador Sea located the massive, submerged delta of what is now known as the B...
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ftuninewbrunojs:oai:ojs.journals.lib.unb.ca:article/32566 2023-05-15T15:17:23+02:00 The Great Preglacial “Bell River” of North America: Detrital Zircon Evidence for Oligocene–Miocene Fluvial Connections Between the Colorado Plateau and Labrador Sea Sears, James W. Beranek, Luke P. 2022-03-26 application/pdf https://journals.lib.unb.ca/index.php/GC/article/view/32566 eng eng Geological Association of Canada https://journals.lib.unb.ca/index.php/GC/article/view/32566/1882528021 https://journals.lib.unb.ca/index.php/GC/article/view/32566 Copyright (c) 2022 Geoscience Canada Geoscience Canada; Vol. 49 No. 1 (2022); 29–42 1911-4850 0315-0941 Bell River Cenozoic Colorado Plateau Detrital zircon Grand Canyon Labrador Sea Paleogeography info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion research-article 2022 ftuninewbrunojs 2022-07-11T11:48:39Z The idea of a great pre-glacial river that drained much of North America into the Arctic waters of modern Canada was first suggested in 1895 by Robert A. Bell. In the 1970s, petroleum exploration in Hudson Strait and the Labrador Sea located the massive, submerged delta of what is now known as the Bell River. Reconstructions suggest that three main branches of the Bell River joined up near modern Hudson Bay. The eastern branch largely drained the Canadian Shield, but the central and western branches had headwaters in the Cordilleran orogenic belt and its foreland in the present-day U.S. and northwestern Canada, respectively. We present new detrital zircon U–Pb data from Lower Oligocene and Lower Miocene sand from an exploration well in the Saglek delta of the northern Labrador Sea. In conjunction with other detrital zircon results from the Labrador Sea (and elsewhere) these data record the configuration and history of this continental-scale drainage basin in more detail. Mesozoic and younger detrital zircon grains (< 250 Ma) are subordinate to Precambrian age groupings, but Cenozoic populations become more abundant during the Oligocene, suggesting that the basin had expanded into areas now occupied by the Colorado Plateau and the Basin-and-Range Province. Proterozoic and Phanerozoic detrital zircon grain populations in Saglek delta sediments are similar to those of the Pliocene Colorado River. The results support an earlier idea that initial incision of the Grand Canyon and denudation of the Colorado Plateau were associated with a north-flowing paleo-river that fed into the Bell River basin. This contribution continued until the Pliocene capture of this ancestral river by the Gulf of California basin, after which the excavation of the modern Grand Canyon was completed. The Bell River drainage basin was later blocked by the expansion of Pleistocene ice sheets. L'idée d'un grand fleuve préglaciaire qui drainait une grande partie de l'Amérique du Nord vers les eaux arctiques du Canada moderne a été suggérée ... Article in Journal/Newspaper Arctic Arctique* Hudson Bay Hudson Strait Labrador Sea University of New Brunswick: Centre for Digital Scholarship Journals Arctic Bell River ENVELOPE(-137.783,-137.783,67.282,67.282) Canada Hudson Hudson Bay Hudson Strait ENVELOPE(-70.000,-70.000,62.000,62.000) |
institution |
Open Polar |
collection |
University of New Brunswick: Centre for Digital Scholarship Journals |
op_collection_id |
ftuninewbrunojs |
language |
English |
topic |
Bell River Cenozoic Colorado Plateau Detrital zircon Grand Canyon Labrador Sea Paleogeography |
spellingShingle |
Bell River Cenozoic Colorado Plateau Detrital zircon Grand Canyon Labrador Sea Paleogeography Sears, James W. Beranek, Luke P. The Great Preglacial “Bell River” of North America: Detrital Zircon Evidence for Oligocene–Miocene Fluvial Connections Between the Colorado Plateau and Labrador Sea |
topic_facet |
Bell River Cenozoic Colorado Plateau Detrital zircon Grand Canyon Labrador Sea Paleogeography |
description |
The idea of a great pre-glacial river that drained much of North America into the Arctic waters of modern Canada was first suggested in 1895 by Robert A. Bell. In the 1970s, petroleum exploration in Hudson Strait and the Labrador Sea located the massive, submerged delta of what is now known as the Bell River. Reconstructions suggest that three main branches of the Bell River joined up near modern Hudson Bay. The eastern branch largely drained the Canadian Shield, but the central and western branches had headwaters in the Cordilleran orogenic belt and its foreland in the present-day U.S. and northwestern Canada, respectively. We present new detrital zircon U–Pb data from Lower Oligocene and Lower Miocene sand from an exploration well in the Saglek delta of the northern Labrador Sea. In conjunction with other detrital zircon results from the Labrador Sea (and elsewhere) these data record the configuration and history of this continental-scale drainage basin in more detail. Mesozoic and younger detrital zircon grains (< 250 Ma) are subordinate to Precambrian age groupings, but Cenozoic populations become more abundant during the Oligocene, suggesting that the basin had expanded into areas now occupied by the Colorado Plateau and the Basin-and-Range Province. Proterozoic and Phanerozoic detrital zircon grain populations in Saglek delta sediments are similar to those of the Pliocene Colorado River. The results support an earlier idea that initial incision of the Grand Canyon and denudation of the Colorado Plateau were associated with a north-flowing paleo-river that fed into the Bell River basin. This contribution continued until the Pliocene capture of this ancestral river by the Gulf of California basin, after which the excavation of the modern Grand Canyon was completed. The Bell River drainage basin was later blocked by the expansion of Pleistocene ice sheets. L'idée d'un grand fleuve préglaciaire qui drainait une grande partie de l'Amérique du Nord vers les eaux arctiques du Canada moderne a été suggérée ... |
format |
Article in Journal/Newspaper |
author |
Sears, James W. Beranek, Luke P. |
author_facet |
Sears, James W. Beranek, Luke P. |
author_sort |
Sears, James W. |
title |
The Great Preglacial “Bell River” of North America: Detrital Zircon Evidence for Oligocene–Miocene Fluvial Connections Between the Colorado Plateau and Labrador Sea |
title_short |
The Great Preglacial “Bell River” of North America: Detrital Zircon Evidence for Oligocene–Miocene Fluvial Connections Between the Colorado Plateau and Labrador Sea |
title_full |
The Great Preglacial “Bell River” of North America: Detrital Zircon Evidence for Oligocene–Miocene Fluvial Connections Between the Colorado Plateau and Labrador Sea |
title_fullStr |
The Great Preglacial “Bell River” of North America: Detrital Zircon Evidence for Oligocene–Miocene Fluvial Connections Between the Colorado Plateau and Labrador Sea |
title_full_unstemmed |
The Great Preglacial “Bell River” of North America: Detrital Zircon Evidence for Oligocene–Miocene Fluvial Connections Between the Colorado Plateau and Labrador Sea |
title_sort |
great preglacial “bell river” of north america: detrital zircon evidence for oligocene–miocene fluvial connections between the colorado plateau and labrador sea |
publisher |
Geological Association of Canada |
publishDate |
2022 |
url |
https://journals.lib.unb.ca/index.php/GC/article/view/32566 |
long_lat |
ENVELOPE(-137.783,-137.783,67.282,67.282) ENVELOPE(-70.000,-70.000,62.000,62.000) |
geographic |
Arctic Bell River Canada Hudson Hudson Bay Hudson Strait |
geographic_facet |
Arctic Bell River Canada Hudson Hudson Bay Hudson Strait |
genre |
Arctic Arctique* Hudson Bay Hudson Strait Labrador Sea |
genre_facet |
Arctic Arctique* Hudson Bay Hudson Strait Labrador Sea |
op_source |
Geoscience Canada; Vol. 49 No. 1 (2022); 29–42 1911-4850 0315-0941 |
op_relation |
https://journals.lib.unb.ca/index.php/GC/article/view/32566/1882528021 https://journals.lib.unb.ca/index.php/GC/article/view/32566 |
op_rights |
Copyright (c) 2022 Geoscience Canada |
_version_ |
1766347629407502336 |