Temporal evolution of a deeply eroded orogen:The Nagssugtoqidian Orogen, West Greenland
The east-northeast-trending Paleoproterozoic Nagssugtoqidian Orogen of West Greenland records the response of deep crust to collision of the North Atlantic craton and a lesser known cratonic mass to the north. This paper presents conventional U-Pb ages of documented magmatic and thermotectonic event...
Published in: | Canadian Journal of Earth Sciences |
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Format: | Article in Journal/Newspaper |
Language: | English |
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2000
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Online Access: | https://curis.ku.dk/portal/da/publications/temporal-evolution-of-a-deeply-eroded-orogen(794a87d0-b8da-4e11-a4e5-ee8cb8cb1e8f).html https://doi.org/10.1139/e00-032 http://www.scopus.com/inward/record.url?scp=0033820812&partnerID=8YFLogxK |
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ftcopenhagenunip:oai:pure.atira.dk:publications/794a87d0-b8da-4e11-a4e5-ee8cb8cb1e8f 2023-05-15T15:35:35+02:00 Temporal evolution of a deeply eroded orogen:The Nagssugtoqidian Orogen, West Greenland Connelly, James N. Van Gool, Jeroen A.M. Mengel, Flemming C. 2000-08 https://curis.ku.dk/portal/da/publications/temporal-evolution-of-a-deeply-eroded-orogen(794a87d0-b8da-4e11-a4e5-ee8cb8cb1e8f).html https://doi.org/10.1139/e00-032 http://www.scopus.com/inward/record.url?scp=0033820812&partnerID=8YFLogxK eng eng info:eu-repo/semantics/restrictedAccess Connelly , J N , Van Gool , J A M & Mengel , F C 2000 , ' Temporal evolution of a deeply eroded orogen : The Nagssugtoqidian Orogen, West Greenland ' , Canadian Journal of Earth Sciences , vol. 37 , no. 8 , pp. 1121-1142 . https://doi.org/10.1139/e00-032 article 2000 ftcopenhagenunip https://doi.org/10.1139/e00-032 2023-02-08T23:55:10Z The east-northeast-trending Paleoproterozoic Nagssugtoqidian Orogen of West Greenland records the response of deep crust to collision of the North Atlantic craton and a lesser known cratonic mass to the north. This paper presents conventional U-Pb ages of documented magmatic and thermotectonic events within this orogen, thus providing a precise time frame for its development and offering a test of previous spatial and temporal correlations with segments of the Trans-Hudson Orogen of northern Labrador and Quebec. Convergence of the two cratons culminated in a collision that commenced after 1873 +7 -4 Ma, the crystallization age of the youngest known pre-Nagssugtoqidian, subduction-related intrusion. Earliest collisional deformation was thrust dominated (west-northwest vergent) and caused thickening and consequent heating to peak temperatures by ca. 1850 Ma. Subsequent north-south shortening at elevated temperatures was accommodated by a fold-dominated style of deformation dated at 1825 ± 1 Ma. Between 1821 and 1778 Ma, temperatures remained sufficiently high to generate pegmatites, metamorphic zircon, and titanite, but no major, penetrative structures are known to have formed in this interval. Further shortening between 1779 ± 6 and 1774 ± 6 Ma exploited preexisting fabrics in steep F 3 fold limbs to form discrete, east-northeast - west-southwest-oriented, sinistral steep belts that are not important crustal boundaries. One of these late, steep belts is cut by 1772-1761 Ma pegmatites, indicating that deformation was waning by this time. Slow cooling followed the late shearing, with rutile closing in the central Nagssugtoqidian Orogen as late as 1676 ± 10 Ma. The timing of tectonic events in the Nagssugtoqidian Orogen is indistinguishable from that of the Quebec-Baffin and Torngat segments of the Trans-Hudson Orogen of northeastern Laurentia. Accepting an intercratonic setting for the Nagssugtoqidian Orogen, this new data require that the Quebec-Baffin, Torngat, and Nagssugtoqidian orogens meet in a triple ... Article in Journal/Newspaper Baffin Greenland North Atlantic University of Copenhagen: Research Greenland Hudson Canadian Journal of Earth Sciences 37 8 1121 1142 |
institution |
Open Polar |
collection |
University of Copenhagen: Research |
op_collection_id |
ftcopenhagenunip |
language |
English |
description |
The east-northeast-trending Paleoproterozoic Nagssugtoqidian Orogen of West Greenland records the response of deep crust to collision of the North Atlantic craton and a lesser known cratonic mass to the north. This paper presents conventional U-Pb ages of documented magmatic and thermotectonic events within this orogen, thus providing a precise time frame for its development and offering a test of previous spatial and temporal correlations with segments of the Trans-Hudson Orogen of northern Labrador and Quebec. Convergence of the two cratons culminated in a collision that commenced after 1873 +7 -4 Ma, the crystallization age of the youngest known pre-Nagssugtoqidian, subduction-related intrusion. Earliest collisional deformation was thrust dominated (west-northwest vergent) and caused thickening and consequent heating to peak temperatures by ca. 1850 Ma. Subsequent north-south shortening at elevated temperatures was accommodated by a fold-dominated style of deformation dated at 1825 ± 1 Ma. Between 1821 and 1778 Ma, temperatures remained sufficiently high to generate pegmatites, metamorphic zircon, and titanite, but no major, penetrative structures are known to have formed in this interval. Further shortening between 1779 ± 6 and 1774 ± 6 Ma exploited preexisting fabrics in steep F 3 fold limbs to form discrete, east-northeast - west-southwest-oriented, sinistral steep belts that are not important crustal boundaries. One of these late, steep belts is cut by 1772-1761 Ma pegmatites, indicating that deformation was waning by this time. Slow cooling followed the late shearing, with rutile closing in the central Nagssugtoqidian Orogen as late as 1676 ± 10 Ma. The timing of tectonic events in the Nagssugtoqidian Orogen is indistinguishable from that of the Quebec-Baffin and Torngat segments of the Trans-Hudson Orogen of northeastern Laurentia. Accepting an intercratonic setting for the Nagssugtoqidian Orogen, this new data require that the Quebec-Baffin, Torngat, and Nagssugtoqidian orogens meet in a triple ... |
format |
Article in Journal/Newspaper |
author |
Connelly, James N. Van Gool, Jeroen A.M. Mengel, Flemming C. |
spellingShingle |
Connelly, James N. Van Gool, Jeroen A.M. Mengel, Flemming C. Temporal evolution of a deeply eroded orogen:The Nagssugtoqidian Orogen, West Greenland |
author_facet |
Connelly, James N. Van Gool, Jeroen A.M. Mengel, Flemming C. |
author_sort |
Connelly, James N. |
title |
Temporal evolution of a deeply eroded orogen:The Nagssugtoqidian Orogen, West Greenland |
title_short |
Temporal evolution of a deeply eroded orogen:The Nagssugtoqidian Orogen, West Greenland |
title_full |
Temporal evolution of a deeply eroded orogen:The Nagssugtoqidian Orogen, West Greenland |
title_fullStr |
Temporal evolution of a deeply eroded orogen:The Nagssugtoqidian Orogen, West Greenland |
title_full_unstemmed |
Temporal evolution of a deeply eroded orogen:The Nagssugtoqidian Orogen, West Greenland |
title_sort |
temporal evolution of a deeply eroded orogen:the nagssugtoqidian orogen, west greenland |
publishDate |
2000 |
url |
https://curis.ku.dk/portal/da/publications/temporal-evolution-of-a-deeply-eroded-orogen(794a87d0-b8da-4e11-a4e5-ee8cb8cb1e8f).html https://doi.org/10.1139/e00-032 http://www.scopus.com/inward/record.url?scp=0033820812&partnerID=8YFLogxK |
geographic |
Greenland Hudson |
geographic_facet |
Greenland Hudson |
genre |
Baffin Greenland North Atlantic |
genre_facet |
Baffin Greenland North Atlantic |
op_source |
Connelly , J N , Van Gool , J A M & Mengel , F C 2000 , ' Temporal evolution of a deeply eroded orogen : The Nagssugtoqidian Orogen, West Greenland ' , Canadian Journal of Earth Sciences , vol. 37 , no. 8 , pp. 1121-1142 . https://doi.org/10.1139/e00-032 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1139/e00-032 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
37 |
container_issue |
8 |
container_start_page |
1121 |
op_container_end_page |
1142 |
_version_ |
1766365924800069632 |