Change from thrusting to syncollisional extension at a mid-crustal level: an example from the Palaeoproterozoic Nagssugtoqidian Orogen (West Greenland)
The Palaeoproterozoic Nagssugtoqidian Orogen in West Greenland represents a mid- to deep-crustal section through a collisional orogen with a complex intrusive, tectonic, and metamorphic history. In the northeastern central part of the orogen, in the Ussuit area, Palaeoproterozoic intrusive and supra...
Published in: | Canadian Journal of Earth Sciences |
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Language: | English |
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Canadian Science Publishing
1998
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Online Access: | http://dx.doi.org/10.1139/e98-030 http://www.nrcresearchpress.com/doi/pdf/10.1139/e98-030 |
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crcansciencepubl:10.1139/e98-030 2024-06-23T07:53:17+00:00 Change from thrusting to syncollisional extension at a mid-crustal level: an example from the Palaeoproterozoic Nagssugtoqidian Orogen (West Greenland) Manatschal, Gianreto Ulfbeck, David van Gool, Jeroen 1998 http://dx.doi.org/10.1139/e98-030 http://www.nrcresearchpress.com/doi/pdf/10.1139/e98-030 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 35, issue 7, page 802-819 ISSN 0008-4077 1480-3313 journal-article 1998 crcansciencepubl https://doi.org/10.1139/e98-030 2024-06-06T04:11:16Z The Palaeoproterozoic Nagssugtoqidian Orogen in West Greenland represents a mid- to deep-crustal section through a collisional orogen with a complex intrusive, tectonic, and metamorphic history. In the northeastern central part of the orogen, in the Ussuit area, Palaeoproterozoic intrusive and supracrustal rocks are sandwiched between slices of Archaean rocks forming a stack of lithotectonic units. Juxtaposition of these units occurred during west- to northwest-vergent thrusting along ductile shear zones (= D1) associated with a foliation formed at upper amphibolite facies conditions. D1 structures were folded (= F A ) and then reactivated and locally omitted by localized east- to east-northeast-vergent extensional ductile shear zones (= D2) at near-peak metamorphic conditions. Shallowly east-plunging, transport-parallel upright folds (= F B ) affect but are also truncated by D2 extensional shear zones, suggesting an interplay between F B folding and D2 shearing, compatible with a scenario of overall shortening perpendicular to fold axial surface during simultaneous extension parallel to fold axes. Consequently, the structures preserved in the Ussuit area document a deformation history which results from a change from thrusting to syncollisional extension occurring in mid- to lower crustal levels at peak metamorphic conditions. Article in Journal/Newspaper Greenland Canadian Science Publishing Greenland Ussuit ENVELOPE(-50.450,-50.450,67.833,67.833) Canadian Journal of Earth Sciences 35 7 802 819 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
The Palaeoproterozoic Nagssugtoqidian Orogen in West Greenland represents a mid- to deep-crustal section through a collisional orogen with a complex intrusive, tectonic, and metamorphic history. In the northeastern central part of the orogen, in the Ussuit area, Palaeoproterozoic intrusive and supracrustal rocks are sandwiched between slices of Archaean rocks forming a stack of lithotectonic units. Juxtaposition of these units occurred during west- to northwest-vergent thrusting along ductile shear zones (= D1) associated with a foliation formed at upper amphibolite facies conditions. D1 structures were folded (= F A ) and then reactivated and locally omitted by localized east- to east-northeast-vergent extensional ductile shear zones (= D2) at near-peak metamorphic conditions. Shallowly east-plunging, transport-parallel upright folds (= F B ) affect but are also truncated by D2 extensional shear zones, suggesting an interplay between F B folding and D2 shearing, compatible with a scenario of overall shortening perpendicular to fold axial surface during simultaneous extension parallel to fold axes. Consequently, the structures preserved in the Ussuit area document a deformation history which results from a change from thrusting to syncollisional extension occurring in mid- to lower crustal levels at peak metamorphic conditions. |
format |
Article in Journal/Newspaper |
author |
Manatschal, Gianreto Ulfbeck, David van Gool, Jeroen |
spellingShingle |
Manatschal, Gianreto Ulfbeck, David van Gool, Jeroen Change from thrusting to syncollisional extension at a mid-crustal level: an example from the Palaeoproterozoic Nagssugtoqidian Orogen (West Greenland) |
author_facet |
Manatschal, Gianreto Ulfbeck, David van Gool, Jeroen |
author_sort |
Manatschal, Gianreto |
title |
Change from thrusting to syncollisional extension at a mid-crustal level: an example from the Palaeoproterozoic Nagssugtoqidian Orogen (West Greenland) |
title_short |
Change from thrusting to syncollisional extension at a mid-crustal level: an example from the Palaeoproterozoic Nagssugtoqidian Orogen (West Greenland) |
title_full |
Change from thrusting to syncollisional extension at a mid-crustal level: an example from the Palaeoproterozoic Nagssugtoqidian Orogen (West Greenland) |
title_fullStr |
Change from thrusting to syncollisional extension at a mid-crustal level: an example from the Palaeoproterozoic Nagssugtoqidian Orogen (West Greenland) |
title_full_unstemmed |
Change from thrusting to syncollisional extension at a mid-crustal level: an example from the Palaeoproterozoic Nagssugtoqidian Orogen (West Greenland) |
title_sort |
change from thrusting to syncollisional extension at a mid-crustal level: an example from the palaeoproterozoic nagssugtoqidian orogen (west greenland) |
publisher |
Canadian Science Publishing |
publishDate |
1998 |
url |
http://dx.doi.org/10.1139/e98-030 http://www.nrcresearchpress.com/doi/pdf/10.1139/e98-030 |
long_lat |
ENVELOPE(-50.450,-50.450,67.833,67.833) |
geographic |
Greenland Ussuit |
geographic_facet |
Greenland Ussuit |
genre |
Greenland |
genre_facet |
Greenland |
op_source |
Canadian Journal of Earth Sciences volume 35, issue 7, page 802-819 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e98-030 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
35 |
container_issue |
7 |
container_start_page |
802 |
op_container_end_page |
819 |
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1802644859263123456 |