Lithospheric architecture beneath Hudson Bay
Hudson Bay overlies some of the thickest Precambrian lithosphere on Earth, whose internal structures contain important clues to the earliest workings of plate formation. The terminal collision, the Trans-Hudson Orogen, brought together the Western Churchill craton to the northwest and the Superior c...
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ftunivquebec:oai:archipel.uqam.ca:8258 2023-07-16T03:58:54+02:00 Lithospheric architecture beneath Hudson Bay Porritt, Robert W. Miller, Meghan S. Darbyshire, Fiona A. 2015-07 application/pdf http://archipel.uqam.ca/8258/1/Porritt_et_al_Geochemistry_Geophysics_Geosystems_2015_16_2262-2275.pdf en eng http://archipel.uqam.ca/8258/ http://dx.doi.org/10.1002/2015GC005845 doi:10.1002/2015GC005845 http://archipel.uqam.ca/8258/1/Porritt_et_al_Geochemistry_Geophysics_Geosystems_2015_16_2262-2275.pdf Porritt, Robert W.; Miller, Meghan S. et Darbyshire, Fiona A. (2015). « Lithospheric architecture beneath Hudson Bay ». Geochemistry, Geophysics, Geosystems, 16(7), pp. 2262-2275. Hudson Bay craton receiver functions joint inversion midlithospheric discontinuities Article de revue scientifique PeerReviewed 2015 ftunivquebec https://doi.org/10.1002/2015GC005845 2023-06-24T23:20:51Z Hudson Bay overlies some of the thickest Precambrian lithosphere on Earth, whose internal structures contain important clues to the earliest workings of plate formation. The terminal collision, the Trans-Hudson Orogen, brought together the Western Churchill craton to the northwest and the Superior craton to the southeast. These two Archean cratons along with the Paleo-Proterozoic Trans-Hudson internides, form the core of the North American craton. We use S to P converted wave imaging and absolute shear velocity information from a joint inversion of P to S receiver functions, new ambient noise derived phase velocities, and teleseismic phase velocities to investigate this region and determine both the thickness of the lithosphere and the presence of internal discontinuities. The lithosphere under central Hudson Bay approaches ∼350 km thick but is thinner (∼200–250 km) around the periphery of the Bay. Furthermore, the amplitude of the LAB conversion from the S receiver functions is unusually large for a craton, suggesting a large thermal contrast across the LAB, which we interpret as direct evidence of the thermal insulation effect of continents on the asthenosphere. Within the lithosphere, midlithospheric discontinuities, significantly shallower than the base of the lithosphere, are often imaged, suggesting the mechanisms that form these layers are common. Lacking time-history information, we infer that these discontinuities reflect reactivation of formation structures during deformation of the craton. Text Hudson Bay UQAM - Université du Québec à Montréal: archipel Hudson Bay Hudson Geochemistry, Geophysics, Geosystems 16 7 2262 2275 |
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UQAM - Université du Québec à Montréal: archipel |
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ftunivquebec |
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English |
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Hudson Bay craton receiver functions joint inversion midlithospheric discontinuities |
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Hudson Bay craton receiver functions joint inversion midlithospheric discontinuities Porritt, Robert W. Miller, Meghan S. Darbyshire, Fiona A. Lithospheric architecture beneath Hudson Bay |
topic_facet |
Hudson Bay craton receiver functions joint inversion midlithospheric discontinuities |
description |
Hudson Bay overlies some of the thickest Precambrian lithosphere on Earth, whose internal structures contain important clues to the earliest workings of plate formation. The terminal collision, the Trans-Hudson Orogen, brought together the Western Churchill craton to the northwest and the Superior craton to the southeast. These two Archean cratons along with the Paleo-Proterozoic Trans-Hudson internides, form the core of the North American craton. We use S to P converted wave imaging and absolute shear velocity information from a joint inversion of P to S receiver functions, new ambient noise derived phase velocities, and teleseismic phase velocities to investigate this region and determine both the thickness of the lithosphere and the presence of internal discontinuities. The lithosphere under central Hudson Bay approaches ∼350 km thick but is thinner (∼200–250 km) around the periphery of the Bay. Furthermore, the amplitude of the LAB conversion from the S receiver functions is unusually large for a craton, suggesting a large thermal contrast across the LAB, which we interpret as direct evidence of the thermal insulation effect of continents on the asthenosphere. Within the lithosphere, midlithospheric discontinuities, significantly shallower than the base of the lithosphere, are often imaged, suggesting the mechanisms that form these layers are common. Lacking time-history information, we infer that these discontinuities reflect reactivation of formation structures during deformation of the craton. |
format |
Text |
author |
Porritt, Robert W. Miller, Meghan S. Darbyshire, Fiona A. |
author_facet |
Porritt, Robert W. Miller, Meghan S. Darbyshire, Fiona A. |
author_sort |
Porritt, Robert W. |
title |
Lithospheric architecture beneath Hudson Bay |
title_short |
Lithospheric architecture beneath Hudson Bay |
title_full |
Lithospheric architecture beneath Hudson Bay |
title_fullStr |
Lithospheric architecture beneath Hudson Bay |
title_full_unstemmed |
Lithospheric architecture beneath Hudson Bay |
title_sort |
lithospheric architecture beneath hudson bay |
publishDate |
2015 |
url |
http://archipel.uqam.ca/8258/1/Porritt_et_al_Geochemistry_Geophysics_Geosystems_2015_16_2262-2275.pdf |
geographic |
Hudson Bay Hudson |
geographic_facet |
Hudson Bay Hudson |
genre |
Hudson Bay |
genre_facet |
Hudson Bay |
op_relation |
http://archipel.uqam.ca/8258/ http://dx.doi.org/10.1002/2015GC005845 doi:10.1002/2015GC005845 http://archipel.uqam.ca/8258/1/Porritt_et_al_Geochemistry_Geophysics_Geosystems_2015_16_2262-2275.pdf Porritt, Robert W.; Miller, Meghan S. et Darbyshire, Fiona A. (2015). « Lithospheric architecture beneath Hudson Bay ». Geochemistry, Geophysics, Geosystems, 16(7), pp. 2262-2275. |
op_doi |
https://doi.org/10.1002/2015GC005845 |
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Geochemistry, Geophysics, Geosystems |
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16 |
container_issue |
7 |
container_start_page |
2262 |
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2275 |
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