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 datasets
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...
Published in: | Journal of Geophysical Research: Solid Earth |
---|---|
Main Authors: | , , , , , |
Other Authors: | |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
American Geophysical Union
2018
|
Subjects: | |
Online Access: | http://hdl.handle.net/10044/1/60934 https://doi.org/10.1029/2018JB015473 |
id |
ftimperialcol:oai:spiral.imperial.ac.uk:10044/1/60934 |
---|---|
record_format |
openpolar |
spelling |
ftimperialcol:oai:spiral.imperial.ac.uk:10044/1/60934 2023-05-15T15:35:24+02:00 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 datasets Liddell, M Bastow, ID Rawlinson, N Darbyshire, F Gilligan, A Watson, E The Leverhulme Trust 2018-06-02 http://hdl.handle.net/10044/1/60934 https://doi.org/10.1029/2018JB015473 unknown American Geophysical Union Journal of Geophysical Research. Solid Earth ©2018. American Geophysical Union. All Rights Reserved. 5709 5690 Journal Article 2018 ftimperialcol https://doi.org/10.1029/2018JB015473 2019-08-08T22:37:27Z 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 P and S wave tomographic models of the mantle seismic structure using data from recent seismograph networks stretching from northern Ontario to Nunavut (60–100∘W and 50–80∘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. Article in Journal/Newspaper Baffin Island Baffin Hudson Bay Nunavut Imperial College London: Spiral Baffin Island Canada Hudson Hudson Bay Nunavut Journal of Geophysical Research: Solid Earth 123 7 5690 5709 |
institution |
Open Polar |
collection |
Imperial College London: Spiral |
op_collection_id |
ftimperialcol |
language |
unknown |
description |
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 P and S wave tomographic models of the mantle seismic structure using data from recent seismograph networks stretching from northern Ontario to Nunavut (60–100∘W and 50–80∘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. |
author2 |
The Leverhulme Trust |
format |
Article in Journal/Newspaper |
author |
Liddell, M Bastow, ID Rawlinson, N Darbyshire, F Gilligan, A Watson, E |
spellingShingle |
Liddell, M Bastow, ID 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 datasets |
author_facet |
Liddell, M Bastow, ID Rawlinson, N Darbyshire, F Gilligan, A Watson, E |
author_sort |
Liddell, M |
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 datasets |
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 datasets |
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 datasets |
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 datasets |
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 datasets |
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 datasets |
publisher |
American Geophysical Union |
publishDate |
2018 |
url |
http://hdl.handle.net/10044/1/60934 https://doi.org/10.1029/2018JB015473 |
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_source |
5709 5690 |
op_relation |
Journal of Geophysical Research. Solid Earth |
op_rights |
©2018. American Geophysical Union. All Rights Reserved. |
op_doi |
https://doi.org/10.1029/2018JB015473 |
container_title |
Journal of Geophysical Research: Solid Earth |
container_volume |
123 |
container_issue |
7 |
container_start_page |
5690 |
op_container_end_page |
5709 |
_version_ |
1766365743617671168 |