A tale of two orogens: Crustal processes in the Proterozoic Trans-Hudson and Grenville Orogens, eastern Canada
The Precambrian core of North America was assembled in the Proterozoic by a series of collisions between Archean cratons. Among the orogenic belts, two stand out due to their significant spatial extent. The Paleoproterozoic Trans-Hudson Orogen (THO) and Mesoproterozoic Grenville Orogen extend for th...
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American Geophysical Union (AGU) / Wiley
2017
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ftunivcardiff:oai:https://orca.cardiff.ac.uk:102250 2023-05-15T16:35:31+02:00 A tale of two orogens: Crustal processes in the Proterozoic Trans-Hudson and Grenville Orogens, eastern Canada Darbyshire, F.A. Bastow, I.D. Petrescu, L. Gilligan, A. Thompson, D. A. 2017-08-31 application/pdf https://orca.cardiff.ac.uk/id/eprint/102250/ https://doi.org/10.1002/2017TC004479 https://orca.cardiff.ac.uk/id/eprint/102250/8/Tectonics%202017TC004479%20%281%29.pdf en eng American Geophysical Union (AGU) / Wiley https://orca.cardiff.ac.uk/id/eprint/102250/8/Tectonics%202017TC004479%20%281%29.pdf Darbyshire, F.A., Bastow, I.D., Petrescu, L., Gilligan, A. and Thompson, D. A. https://orca.cardiff.ac.uk/view/cardiffauthors/A2269789I.html orcid:0000-0001-5153-6807 orcid:0000-0001-5153-6807 2017. A tale of two orogens: Crustal processes in the Proterozoic Trans-Hudson and Grenville Orogens, eastern Canada. Tectonics 36 (8) , pp. 1633-1659. 10.1002/2017TC004479 https://doi.org/10.1002/2017TC004479 file https://orca.cardiff.ac.uk/102250/8/Tectonics%202017TC004479%20%281%29.pdf doi:10.1002/2017TC004479 QE Geology Article PeerReviewed 2017 ftunivcardiff https://doi.org/10.1002/2017TC004479 2022-11-03T23:42:27Z The Precambrian core of North America was assembled in the Proterozoic by a series of collisions between Archean cratons. Among the orogenic belts, two stand out due to their significant spatial extent. The Paleoproterozoic Trans-Hudson Orogen (THO) and Mesoproterozoic Grenville Orogen extend for thousands of kilometers along-strike and hundreds of kilometers across-strike. Both have been compared to the present-day Himalayan-Karakoram-Tibetan Orogen (HKTO). Over the last 20–30 years, active and passive-source seismic studies have contributed a wealth of information about the present-day crustal structure and composition of the two orogens in Canada. The Proterozoic orogenic crust is generally thicker than that of neighboring Archean terranes, with a more variable Moho character, ranging from relatively sharp to highly diffuse. Both orogens have a prominent high-velocity lower-crustal layer, consistent with long-term preservation of a partially-eclogitized root at the base of the crust and similar to that inferred beneath the western HKTO. Crustal structure in the northern THO strongly resembles the lower-crustal structure of the HKTO, suggesting that Moho depths may have reached 60–70 km when the orogen was active. A prominent mid-crustal discontinuity beneath the central Grenville Province and changes in the patterns of seismic anisotropy in the THO crust beneath Hudson Bay provide geophysical evidence that lower-crustal flow likely played a role in the evolution of both orogens, similar to that inferred beneath the present-day HKTO. The seismic evidence from Canada supports the notion of tectonic uniformitarianism, at least as far back as the Paleoproterozoic. Article in Journal/Newspaper Hudson Bay Cardiff University: ORCA (Online Research @ Cardiff) Canada Hudson Hudson Bay Tectonics 36 8 1633 1659 |
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Open Polar |
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Cardiff University: ORCA (Online Research @ Cardiff) |
op_collection_id |
ftunivcardiff |
language |
English |
topic |
QE Geology |
spellingShingle |
QE Geology Darbyshire, F.A. Bastow, I.D. Petrescu, L. Gilligan, A. Thompson, D. A. A tale of two orogens: Crustal processes in the Proterozoic Trans-Hudson and Grenville Orogens, eastern Canada |
topic_facet |
QE Geology |
description |
The Precambrian core of North America was assembled in the Proterozoic by a series of collisions between Archean cratons. Among the orogenic belts, two stand out due to their significant spatial extent. The Paleoproterozoic Trans-Hudson Orogen (THO) and Mesoproterozoic Grenville Orogen extend for thousands of kilometers along-strike and hundreds of kilometers across-strike. Both have been compared to the present-day Himalayan-Karakoram-Tibetan Orogen (HKTO). Over the last 20–30 years, active and passive-source seismic studies have contributed a wealth of information about the present-day crustal structure and composition of the two orogens in Canada. The Proterozoic orogenic crust is generally thicker than that of neighboring Archean terranes, with a more variable Moho character, ranging from relatively sharp to highly diffuse. Both orogens have a prominent high-velocity lower-crustal layer, consistent with long-term preservation of a partially-eclogitized root at the base of the crust and similar to that inferred beneath the western HKTO. Crustal structure in the northern THO strongly resembles the lower-crustal structure of the HKTO, suggesting that Moho depths may have reached 60–70 km when the orogen was active. A prominent mid-crustal discontinuity beneath the central Grenville Province and changes in the patterns of seismic anisotropy in the THO crust beneath Hudson Bay provide geophysical evidence that lower-crustal flow likely played a role in the evolution of both orogens, similar to that inferred beneath the present-day HKTO. The seismic evidence from Canada supports the notion of tectonic uniformitarianism, at least as far back as the Paleoproterozoic. |
format |
Article in Journal/Newspaper |
author |
Darbyshire, F.A. Bastow, I.D. Petrescu, L. Gilligan, A. Thompson, D. A. |
author_facet |
Darbyshire, F.A. Bastow, I.D. Petrescu, L. Gilligan, A. Thompson, D. A. |
author_sort |
Darbyshire, F.A. |
title |
A tale of two orogens: Crustal processes in the Proterozoic Trans-Hudson and Grenville Orogens, eastern Canada |
title_short |
A tale of two orogens: Crustal processes in the Proterozoic Trans-Hudson and Grenville Orogens, eastern Canada |
title_full |
A tale of two orogens: Crustal processes in the Proterozoic Trans-Hudson and Grenville Orogens, eastern Canada |
title_fullStr |
A tale of two orogens: Crustal processes in the Proterozoic Trans-Hudson and Grenville Orogens, eastern Canada |
title_full_unstemmed |
A tale of two orogens: Crustal processes in the Proterozoic Trans-Hudson and Grenville Orogens, eastern Canada |
title_sort |
tale of two orogens: crustal processes in the proterozoic trans-hudson and grenville orogens, eastern canada |
publisher |
American Geophysical Union (AGU) / Wiley |
publishDate |
2017 |
url |
https://orca.cardiff.ac.uk/id/eprint/102250/ https://doi.org/10.1002/2017TC004479 https://orca.cardiff.ac.uk/id/eprint/102250/8/Tectonics%202017TC004479%20%281%29.pdf |
geographic |
Canada Hudson Hudson Bay |
geographic_facet |
Canada Hudson Hudson Bay |
genre |
Hudson Bay |
genre_facet |
Hudson Bay |
op_relation |
https://orca.cardiff.ac.uk/id/eprint/102250/8/Tectonics%202017TC004479%20%281%29.pdf Darbyshire, F.A., Bastow, I.D., Petrescu, L., Gilligan, A. and Thompson, D. A. https://orca.cardiff.ac.uk/view/cardiffauthors/A2269789I.html orcid:0000-0001-5153-6807 orcid:0000-0001-5153-6807 2017. A tale of two orogens: Crustal processes in the Proterozoic Trans-Hudson and Grenville Orogens, eastern Canada. Tectonics 36 (8) , pp. 1633-1659. 10.1002/2017TC004479 https://doi.org/10.1002/2017TC004479 file https://orca.cardiff.ac.uk/102250/8/Tectonics%202017TC004479%20%281%29.pdf doi:10.1002/2017TC004479 |
op_doi |
https://doi.org/10.1002/2017TC004479 |
container_title |
Tectonics |
container_volume |
36 |
container_issue |
8 |
container_start_page |
1633 |
op_container_end_page |
1659 |
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1766025753171853312 |