Evolution of Labrador Sea–Baffin Bay: Plate or Plume Processes?
Breakup between Greenland and Canada resulted in oceanic spreading in the Labrador Sea and Baffin Bay. These ocean basins are connected through the Davis Strait, a bathymetric high comprising primarily continental lithosphere, and the focus of the West Greenland Tertiary volcanic province. It has be...
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ftuninewbrunojs:oai:ojs.journals.lib.unb.ca:article/25636 2023-05-15T15:35:00+02:00 Evolution of Labrador Sea–Baffin Bay: Plate or Plume Processes? Peace, Alexander Lewis Foulger, Gillian R. Schiffer, Christian McCaffrey, Ken J.W. 2017-10-06 application/pdf https://journals.lib.unb.ca/index.php/GC/article/view/25636 eng eng Geological Association of Canada https://journals.lib.unb.ca/index.php/GC/article/view/25636/29983 https://journals.lib.unb.ca/index.php/GC/article/view/25636 Copyright (c) 2017 Geoscience Canada Geoscience Canada; Volume 44, Number 3 (2017); 91-102 1911-4850 0315-0941 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2017 ftuninewbrunojs 2022-07-11T11:48:39Z Breakup between Greenland and Canada resulted in oceanic spreading in the Labrador Sea and Baffin Bay. These ocean basins are connected through the Davis Strait, a bathymetric high comprising primarily continental lithosphere, and the focus of the West Greenland Tertiary volcanic province. It has been suggested that a mantle plume facilitated this breakup and generated the associated magmatism. Plume-driven breakup predicts that the earliest, most extensive rifting, magmatism and initial seafloor spreading starts in the same locality, where the postulated plume impinged. Observations from the Labrador Sea–Baffin Bay area do not accord with these predictions. Thus, the plume hypothesis is not confirmed at this locality unless major ad hoc variants are accepted. A model that fits the observations better involves a thick continental lithospheric keel of orogenic origin beneath the Davis Strait that blocked the northward-propagating Labrador Sea rift resulting in locally enhanced magmatism. The Davis Strait lithosphere was thicker and more resilient to rifting because the adjacent Paleoproterozoic Nagssugtoqidian and Torngat orogenic belts contain structures unfavourably orientated with respect to the extensional stress field at the time.RÉSUMÉLa cassure entre le Groenland et le Canada a entraîné une expansion océanique de la mer du Labrador et de la baie de Baffin. Ces bassins océaniques sont reliés par le détroit de Davis, un haut bathymétrique constitué principalement de lithosphère continentale et de la province volcanique tertiaire de l'ouest du Groenland. Il a été suggéré qu'un panache du manteau a facilité cette cassure et généré le magmatisme associé. L’hypothèse d’une cassure produite par panache du manteau prédit que la première distension océanique, la plus importante, le magmatisme et l'expansion océanique initial se produisent là où le panache mantélique touche la croûte continentale. Or les observations dans la région de la mer du Labrador–baie de Baffin ne correspondent pas à ces prédictions. Et donc ... Article in Journal/Newspaper Baffin Bay Baffin Bay Baffin Baie de Baffin Davis Strait Détroit de Davis Greenland Groenland Labrador Sea University of New Brunswick: Centre for Digital Scholarship Journals Baffin Bay Canada Greenland Baie de Baffin ENVELOPE(-67.996,-67.996,74.001,74.001) Mer du Labrador ENVELOPE(-55.998,-55.998,55.000,55.000) Détroit de Davis ENVELOPE(-57.996,-57.996,65.001,65.001) Geoscience Canada 44 3 91 102 |
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Open Polar |
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University of New Brunswick: Centre for Digital Scholarship Journals |
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ftuninewbrunojs |
language |
English |
description |
Breakup between Greenland and Canada resulted in oceanic spreading in the Labrador Sea and Baffin Bay. These ocean basins are connected through the Davis Strait, a bathymetric high comprising primarily continental lithosphere, and the focus of the West Greenland Tertiary volcanic province. It has been suggested that a mantle plume facilitated this breakup and generated the associated magmatism. Plume-driven breakup predicts that the earliest, most extensive rifting, magmatism and initial seafloor spreading starts in the same locality, where the postulated plume impinged. Observations from the Labrador Sea–Baffin Bay area do not accord with these predictions. Thus, the plume hypothesis is not confirmed at this locality unless major ad hoc variants are accepted. A model that fits the observations better involves a thick continental lithospheric keel of orogenic origin beneath the Davis Strait that blocked the northward-propagating Labrador Sea rift resulting in locally enhanced magmatism. The Davis Strait lithosphere was thicker and more resilient to rifting because the adjacent Paleoproterozoic Nagssugtoqidian and Torngat orogenic belts contain structures unfavourably orientated with respect to the extensional stress field at the time.RÉSUMÉLa cassure entre le Groenland et le Canada a entraîné une expansion océanique de la mer du Labrador et de la baie de Baffin. Ces bassins océaniques sont reliés par le détroit de Davis, un haut bathymétrique constitué principalement de lithosphère continentale et de la province volcanique tertiaire de l'ouest du Groenland. Il a été suggéré qu'un panache du manteau a facilité cette cassure et généré le magmatisme associé. L’hypothèse d’une cassure produite par panache du manteau prédit que la première distension océanique, la plus importante, le magmatisme et l'expansion océanique initial se produisent là où le panache mantélique touche la croûte continentale. Or les observations dans la région de la mer du Labrador–baie de Baffin ne correspondent pas à ces prédictions. Et donc ... |
format |
Article in Journal/Newspaper |
author |
Peace, Alexander Lewis Foulger, Gillian R. Schiffer, Christian McCaffrey, Ken J.W. |
spellingShingle |
Peace, Alexander Lewis Foulger, Gillian R. Schiffer, Christian McCaffrey, Ken J.W. Evolution of Labrador Sea–Baffin Bay: Plate or Plume Processes? |
author_facet |
Peace, Alexander Lewis Foulger, Gillian R. Schiffer, Christian McCaffrey, Ken J.W. |
author_sort |
Peace, Alexander Lewis |
title |
Evolution of Labrador Sea–Baffin Bay: Plate or Plume Processes? |
title_short |
Evolution of Labrador Sea–Baffin Bay: Plate or Plume Processes? |
title_full |
Evolution of Labrador Sea–Baffin Bay: Plate or Plume Processes? |
title_fullStr |
Evolution of Labrador Sea–Baffin Bay: Plate or Plume Processes? |
title_full_unstemmed |
Evolution of Labrador Sea–Baffin Bay: Plate or Plume Processes? |
title_sort |
evolution of labrador sea–baffin bay: plate or plume processes? |
publisher |
Geological Association of Canada |
publishDate |
2017 |
url |
https://journals.lib.unb.ca/index.php/GC/article/view/25636 |
long_lat |
ENVELOPE(-67.996,-67.996,74.001,74.001) ENVELOPE(-55.998,-55.998,55.000,55.000) ENVELOPE(-57.996,-57.996,65.001,65.001) |
geographic |
Baffin Bay Canada Greenland Baie de Baffin Mer du Labrador Détroit de Davis |
geographic_facet |
Baffin Bay Canada Greenland Baie de Baffin Mer du Labrador Détroit de Davis |
genre |
Baffin Bay Baffin Bay Baffin Baie de Baffin Davis Strait Détroit de Davis Greenland Groenland Labrador Sea |
genre_facet |
Baffin Bay Baffin Bay Baffin Baie de Baffin Davis Strait Détroit de Davis Greenland Groenland Labrador Sea |
op_source |
Geoscience Canada; Volume 44, Number 3 (2017); 91-102 1911-4850 0315-0941 |
op_relation |
https://journals.lib.unb.ca/index.php/GC/article/view/25636/29983 https://journals.lib.unb.ca/index.php/GC/article/view/25636 |
op_rights |
Copyright (c) 2017 Geoscience Canada |
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Geoscience Canada |
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44 |
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3 |
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91 |
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102 |
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1766365289052635136 |