Precambrian Plate Tectonics in Northern Hudson Bay: Evidence From P and S Wave Seismic Tomography and Analysis of Source Side Effects in Relative Arrival-Time Data Sets
<jats:title>Abstract</jats:title><jats:p>The geology of northern Hudson Bay, Canada, documents more than 2 billion years of history including the assembly of Precambrian and Archean terranes during several Paleoproterozoic orogenies, culminating in the Trans‐Hudson Orogen (THO) ∼1....
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ftunivcam:oai:www.repository.cam.ac.uk:1810/284735 2024-01-14T10:05:35+01:00 Precambrian Plate Tectonics in Northern Hudson Bay: Evidence From P and S Wave Seismic Tomography and Analysis of Source Side Effects in Relative Arrival-Time Data Sets Liddell, MV Bastow, I Rawlinson, N Darbyshire, F Gilligan, A Watson, E 2018 application/pdf https://www.repository.cam.ac.uk/handle/1810/284735 https://doi.org/10.17863/CAM.32107 eng eng American Geophysical Union (AGU) http://dx.doi.org/10.1029/2018jb015473 Journal of Geophysical Research: Solid Earth https://www.repository.cam.ac.uk/handle/1810/284735 doi:10.17863/CAM.32107 seismic tomography relative arrival time cratonic lithosphere Precambrian tectonics Trans-Hudson Orogen source side effect Article 2018 ftunivcam https://doi.org/10.17863/CAM.32107 2023-12-21T23:21:17Z <jats:title>Abstract</jats:title><jats:p>The geology of northern Hudson Bay, Canada, documents more than 2 billion years of history including the assembly of Precambrian and Archean terranes during several Paleoproterozoic orogenies, culminating in the Trans‐Hudson Orogen (THO) ∼1.8 Ga. The THO has been hypothesized to be similar in scale and nature to the ongoing Himalaya‐Karakoram‐Tibetan orogen, but the nature of lithospheric terrane boundaries, including potential plate‐scale underthrusting, is poorly understood. To address this problem, we present new <jats:italic>P</jats:italic> and <jats:italic>S</jats:italic> wave tomographic models of the mantle seismic structure using data from recent seismograph networks stretching from northern Ontario to Nunavut (60–100<jats:sup>∘</jats:sup>W and 50–80<jats:sup>∘</jats:sup>N). The large size of our network requires careful mitigation of the influence of source side structure that contaminates our relative arrival time residuals. Our tomographic models reveal a complicated internal structure in the Archean Churchill plate. However, no seismic wave speed distinction is observed across the Snowbird Tectonic Zone, which bisects the Churchill. The mantle lithosphere in the central region of Hudson Bay is distinct from the THO, indicating potential boundaries of microcontinents and lithospheric blocks between the principal colliders. Slow wave speeds underlie southern Baffin Island, the leading edge of the generally high wave speed Churchill plate. This is interpreted to be Paleoproterozoic material underthrust beneath Baffin Island in a modern‐style subduction zone setting.</jats:p> Article in Journal/Newspaper Baffin Island Baffin Hudson Bay Nunavut Apollo - University of Cambridge Repository Baffin Island Canada Hudson Hudson Bay Nunavut |
institution |
Open Polar |
collection |
Apollo - University of Cambridge Repository |
op_collection_id |
ftunivcam |
language |
English |
topic |
seismic tomography relative arrival time cratonic lithosphere Precambrian tectonics Trans-Hudson Orogen source side effect |
spellingShingle |
seismic tomography relative arrival time cratonic lithosphere Precambrian tectonics Trans-Hudson Orogen source side effect Liddell, MV Bastow, I Rawlinson, N Darbyshire, F Gilligan, A Watson, E Precambrian Plate Tectonics in Northern Hudson Bay: Evidence From P and S Wave Seismic Tomography and Analysis of Source Side Effects in Relative Arrival-Time Data Sets |
topic_facet |
seismic tomography relative arrival time cratonic lithosphere Precambrian tectonics Trans-Hudson Orogen source side effect |
description |
<jats:title>Abstract</jats:title><jats:p>The geology of northern Hudson Bay, Canada, documents more than 2 billion years of history including the assembly of Precambrian and Archean terranes during several Paleoproterozoic orogenies, culminating in the Trans‐Hudson Orogen (THO) ∼1.8 Ga. The THO has been hypothesized to be similar in scale and nature to the ongoing Himalaya‐Karakoram‐Tibetan orogen, but the nature of lithospheric terrane boundaries, including potential plate‐scale underthrusting, is poorly understood. To address this problem, we present new <jats:italic>P</jats:italic> and <jats:italic>S</jats:italic> wave tomographic models of the mantle seismic structure using data from recent seismograph networks stretching from northern Ontario to Nunavut (60–100<jats:sup>∘</jats:sup>W and 50–80<jats:sup>∘</jats:sup>N). The large size of our network requires careful mitigation of the influence of source side structure that contaminates our relative arrival time residuals. Our tomographic models reveal a complicated internal structure in the Archean Churchill plate. However, no seismic wave speed distinction is observed across the Snowbird Tectonic Zone, which bisects the Churchill. The mantle lithosphere in the central region of Hudson Bay is distinct from the THO, indicating potential boundaries of microcontinents and lithospheric blocks between the principal colliders. Slow wave speeds underlie southern Baffin Island, the leading edge of the generally high wave speed Churchill plate. This is interpreted to be Paleoproterozoic material underthrust beneath Baffin Island in a modern‐style subduction zone setting.</jats:p> |
format |
Article in Journal/Newspaper |
author |
Liddell, MV Bastow, I Rawlinson, N Darbyshire, F Gilligan, A Watson, E |
author_facet |
Liddell, MV Bastow, I Rawlinson, N Darbyshire, F Gilligan, A Watson, E |
author_sort |
Liddell, MV |
title |
Precambrian Plate Tectonics in Northern Hudson Bay: Evidence From P and S Wave Seismic Tomography and Analysis of Source Side Effects in Relative Arrival-Time Data Sets |
title_short |
Precambrian Plate Tectonics in Northern Hudson Bay: Evidence From P and S Wave Seismic Tomography and Analysis of Source Side Effects in Relative Arrival-Time Data Sets |
title_full |
Precambrian Plate Tectonics in Northern Hudson Bay: Evidence From P and S Wave Seismic Tomography and Analysis of Source Side Effects in Relative Arrival-Time Data Sets |
title_fullStr |
Precambrian Plate Tectonics in Northern Hudson Bay: Evidence From P and S Wave Seismic Tomography and Analysis of Source Side Effects in Relative Arrival-Time Data Sets |
title_full_unstemmed |
Precambrian Plate Tectonics in Northern Hudson Bay: Evidence From P and S Wave Seismic Tomography and Analysis of Source Side Effects in Relative Arrival-Time Data Sets |
title_sort |
precambrian plate tectonics in northern hudson bay: evidence from p and s wave seismic tomography and analysis of source side effects in relative arrival-time data sets |
publisher |
American Geophysical Union (AGU) |
publishDate |
2018 |
url |
https://www.repository.cam.ac.uk/handle/1810/284735 https://doi.org/10.17863/CAM.32107 |
geographic |
Baffin Island Canada Hudson Hudson Bay Nunavut |
geographic_facet |
Baffin Island Canada Hudson Hudson Bay Nunavut |
genre |
Baffin Island Baffin Hudson Bay Nunavut |
genre_facet |
Baffin Island Baffin Hudson Bay Nunavut |
op_relation |
https://www.repository.cam.ac.uk/handle/1810/284735 doi:10.17863/CAM.32107 |
op_doi |
https://doi.org/10.17863/CAM.32107 |
_version_ |
1788059935432507392 |