Neotectonics and inferred movements in Canada
Neotectonic movements in Canada are due to a variety of causes. Within the Canadian Shield (craton) postglacial rebound appears to be the main contributor. Along the tectonically active western continental margin, plate subduction and transcurrent plate motion are taking place. Further inland there...
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Geological Society of Finland
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ftdoajarticles:oai:doaj.org/article:18e8faf2868249f8889e3177b8588901 2023-05-15T15:35:05+02:00 Neotectonics and inferred movements in Canada H.S. Hasegawa 1988-06-01T00:00:00Z https://doi.org/10.17741/bgsf/60.1.001 https://doaj.org/article/18e8faf2868249f8889e3177b8588901 EN eng Geological Society of Finland http://www.geologinenseura.fi/bulletin/Volume60/sgs_bt_060_1_pages_003_025.pdf https://doaj.org/toc/0367-5211 https://doaj.org/toc/1799-4632 doi:10.17741/bgsf/60.1.001 0367-5211 1799-4632 https://doaj.org/article/18e8faf2868249f8889e3177b8588901 Bulletin of the Geological Society of Finland, Vol 60, Iss 1, Pp 3-25 (1988) neotectonics uplifts glacial geology isostacy seismicity mass movements faults Holocene Canada Geology QE1-996.5 article 1988 ftdoajarticles https://doi.org/10.17741/bgsf/60.1.001 2022-12-31T07:13:27Z Neotectonic movements in Canada are due to a variety of causes. Within the Canadian Shield (craton) postglacial rebound appears to be the main contributor. Along the tectonically active western continental margin, plate subduction and transcurrent plate motion are taking place. Further inland there is a region where mantle upwelling is probably the dominant neotectonic process. Along many parts of the passive continental slopes, unconsolidated sediments are being deposited at a rate faster than isostatic adjustments can take place. Postglacial rebound has a strong influence on seismicity in northeastern Canada (Baffin Island-Baffin Bay region). Seismicity along the southeast (St. Lawrence Valley) appears to be due to a reactivation of ancient zones of weakness by the neotectonic stress field; postglacial rebound stress can, at the most, act as a trigger mechanism for seismicity in this region. Long wavelength phenomena that are related to glacial loading-unloading and postglacial rebound can be represented by an elastic-viscoelastic lithosphere and asthenosphere. However, the spatio-temporal behaviour of the pattern of short-wavelength, nonlinear phenomena to postglacial rebound stress and strain depends on the characteristics of these heterogeneities (e.g. faults, blocks and intrusions). Consequently, in structurally heterogeneous regions in Canada and Fennoscandia with similar types of fault patterns and block geometry, a similar spatio-temporal history of postglacial fault offsets and block movements should occur. In other regions where the structural heterogeneities are different, different types and degrees of postglacial movement can be expected. Article in Journal/Newspaper Baffin Bay Baffin Bay Baffin Island Baffin Fennoscandia Directory of Open Access Journals: DOAJ Articles Baffin Bay Baffin Island Canada Bulletin of the Geological Society of Finland 60 1 3 25 |
institution |
Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
neotectonics uplifts glacial geology isostacy seismicity mass movements faults Holocene Canada Geology QE1-996.5 |
spellingShingle |
neotectonics uplifts glacial geology isostacy seismicity mass movements faults Holocene Canada Geology QE1-996.5 H.S. Hasegawa Neotectonics and inferred movements in Canada |
topic_facet |
neotectonics uplifts glacial geology isostacy seismicity mass movements faults Holocene Canada Geology QE1-996.5 |
description |
Neotectonic movements in Canada are due to a variety of causes. Within the Canadian Shield (craton) postglacial rebound appears to be the main contributor. Along the tectonically active western continental margin, plate subduction and transcurrent plate motion are taking place. Further inland there is a region where mantle upwelling is probably the dominant neotectonic process. Along many parts of the passive continental slopes, unconsolidated sediments are being deposited at a rate faster than isostatic adjustments can take place. Postglacial rebound has a strong influence on seismicity in northeastern Canada (Baffin Island-Baffin Bay region). Seismicity along the southeast (St. Lawrence Valley) appears to be due to a reactivation of ancient zones of weakness by the neotectonic stress field; postglacial rebound stress can, at the most, act as a trigger mechanism for seismicity in this region. Long wavelength phenomena that are related to glacial loading-unloading and postglacial rebound can be represented by an elastic-viscoelastic lithosphere and asthenosphere. However, the spatio-temporal behaviour of the pattern of short-wavelength, nonlinear phenomena to postglacial rebound stress and strain depends on the characteristics of these heterogeneities (e.g. faults, blocks and intrusions). Consequently, in structurally heterogeneous regions in Canada and Fennoscandia with similar types of fault patterns and block geometry, a similar spatio-temporal history of postglacial fault offsets and block movements should occur. In other regions where the structural heterogeneities are different, different types and degrees of postglacial movement can be expected. |
format |
Article in Journal/Newspaper |
author |
H.S. Hasegawa |
author_facet |
H.S. Hasegawa |
author_sort |
H.S. Hasegawa |
title |
Neotectonics and inferred movements in Canada |
title_short |
Neotectonics and inferred movements in Canada |
title_full |
Neotectonics and inferred movements in Canada |
title_fullStr |
Neotectonics and inferred movements in Canada |
title_full_unstemmed |
Neotectonics and inferred movements in Canada |
title_sort |
neotectonics and inferred movements in canada |
publisher |
Geological Society of Finland |
publishDate |
1988 |
url |
https://doi.org/10.17741/bgsf/60.1.001 https://doaj.org/article/18e8faf2868249f8889e3177b8588901 |
geographic |
Baffin Bay Baffin Island Canada |
geographic_facet |
Baffin Bay Baffin Island Canada |
genre |
Baffin Bay Baffin Bay Baffin Island Baffin Fennoscandia |
genre_facet |
Baffin Bay Baffin Bay Baffin Island Baffin Fennoscandia |
op_source |
Bulletin of the Geological Society of Finland, Vol 60, Iss 1, Pp 3-25 (1988) |
op_relation |
http://www.geologinenseura.fi/bulletin/Volume60/sgs_bt_060_1_pages_003_025.pdf https://doaj.org/toc/0367-5211 https://doaj.org/toc/1799-4632 doi:10.17741/bgsf/60.1.001 0367-5211 1799-4632 https://doaj.org/article/18e8faf2868249f8889e3177b8588901 |
op_doi |
https://doi.org/10.17741/bgsf/60.1.001 |
container_title |
Bulletin of the Geological Society of Finland |
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60 |
container_issue |
1 |
container_start_page |
3 |
op_container_end_page |
25 |
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1766365393146871808 |