Tectonomagmatic events during stretching and basin formation in the Labrador Sea and the Davis Strait: evidence from age and composition of Mesozoic to Palaeogene dyke swarms in West Greenland
Mesozoic to Palaeogene intrusive igneous rocks in West Greenland range from a large, coast-parallel dyke swarm to small, poorly defined dyke swarms or single intrusions. New age and geochemical data indicate that intrusion forms and melt compositions changed with time, dependent on changing stress f...
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Online Access: | https://doi.org/10.6084/m9.figshare.3454733.v1 https://figshare.com/articles/Tectonomagmatic_events_during_stretching_and_basin_formation_in_the_Labrador_Sea_and_the_Davis_Strait_evidence_from_age_and___composition_of_Mesozoic_to_Palaeogene_dyke_swarms_in_West_Greenland/3454733 |
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ftgeosoclonfig:oai:figshare.com:article/3454733 2023-05-15T16:00:13+02:00 Tectonomagmatic events during stretching and basin formation in the Labrador Sea and the Davis Strait: evidence from age and composition of Mesozoic to Palaeogene dyke swarms in West Greenland LOTTE M. LARSEN LARRY M. HEAMAN ROBERT A. CREASER ROBERT A. DUNCAN ROBERT FREI MARK HUTCHISON 2016-06-21T12:19:00Z https://doi.org/10.6084/m9.figshare.3454733.v1 https://figshare.com/articles/Tectonomagmatic_events_during_stretching_and_basin_formation_in_the_Labrador_Sea_and_the_Davis_Strait_evidence_from_age_and___composition_of_Mesozoic_to_Palaeogene_dyke_swarms_in_West_Greenland/3454733 unknown doi:10.6084/m9.figshare.3454733.v1 https://figshare.com/articles/Tectonomagmatic_events_during_stretching_and_basin_formation_in_the_Labrador_Sea_and_the_Davis_Strait_evidence_from_age_and___composition_of_Mesozoic_to_Palaeogene_dyke_swarms_in_West_Greenland/3454733 CC BY 4.0 CC-BY Geology Nuussuaq Basin Large basalt sills West Greenland range Ma Palaeocene activity 150 km southwards Palaeogene dyke swarms dykes West Greenland Mesozoic upwelling asthenospheric mantle alkali basaltic magmas stress intrusion Dataset 2016 ftgeosoclonfig https://doi.org/10.6084/m9.figshare.3454733.v1 2020-02-21T07:23:19Z Mesozoic to Palaeogene intrusive igneous rocks in West Greenland range from a large, coast-parallel dyke swarm to small, poorly defined dyke swarms or single intrusions. New age and geochemical data indicate that intrusion forms and melt compositions changed with time, dependent on changing stress fields and increasing lithospheric attenuation. During the period c . 220–150 Ma (Late Triassic to Late Jurassic) incipient stretching is reflected in the production of highly alkaline, volatile-rich melts formed in small volumes in the deep lithosphere. Around 150 Ma (Kimmeridgian), increased extension took place and melts were intruded in a 60 km long swarm of scattered alkaline dykes. In the Early Cretaceous, 140–133 Ma, the regional stress field was intense, upwelling asthenospheric mantle started to melt, and alkali basaltic magmas were emplaced in a 400 km long coastal dyke swarm parallel to large linear faults offshore. In the Palaeocene, continental break-up took place and flood basalts (62–60 Ma) were extruded in the Nuussuaq Basin. Large basalt sills and dykes extend the region with Palaeocene activity 150 km southwards and form a link between the Nuussuaq Basin and the Sisimiut Basin offshore. Dykes with ages of 57–51 Ma indicate widespread younger volcanic activity. Dataset Davis Strait Greenland Labrador Sea Nuussuaq Sisimiut Geological Society of London: Figshare Greenland Sisimiut ENVELOPE(-53.674,-53.674,66.939,66.939) Nuussuaq ENVELOPE(-51.918,-51.918,66.626,66.626) |
institution |
Open Polar |
collection |
Geological Society of London: Figshare |
op_collection_id |
ftgeosoclonfig |
language |
unknown |
topic |
Geology Nuussuaq Basin Large basalt sills West Greenland range Ma Palaeocene activity 150 km southwards Palaeogene dyke swarms dykes West Greenland Mesozoic upwelling asthenospheric mantle alkali basaltic magmas stress intrusion |
spellingShingle |
Geology Nuussuaq Basin Large basalt sills West Greenland range Ma Palaeocene activity 150 km southwards Palaeogene dyke swarms dykes West Greenland Mesozoic upwelling asthenospheric mantle alkali basaltic magmas stress intrusion LOTTE M. LARSEN LARRY M. HEAMAN ROBERT A. CREASER ROBERT A. DUNCAN ROBERT FREI MARK HUTCHISON Tectonomagmatic events during stretching and basin formation in the Labrador Sea and the Davis Strait: evidence from age and composition of Mesozoic to Palaeogene dyke swarms in West Greenland |
topic_facet |
Geology Nuussuaq Basin Large basalt sills West Greenland range Ma Palaeocene activity 150 km southwards Palaeogene dyke swarms dykes West Greenland Mesozoic upwelling asthenospheric mantle alkali basaltic magmas stress intrusion |
description |
Mesozoic to Palaeogene intrusive igneous rocks in West Greenland range from a large, coast-parallel dyke swarm to small, poorly defined dyke swarms or single intrusions. New age and geochemical data indicate that intrusion forms and melt compositions changed with time, dependent on changing stress fields and increasing lithospheric attenuation. During the period c . 220–150 Ma (Late Triassic to Late Jurassic) incipient stretching is reflected in the production of highly alkaline, volatile-rich melts formed in small volumes in the deep lithosphere. Around 150 Ma (Kimmeridgian), increased extension took place and melts were intruded in a 60 km long swarm of scattered alkaline dykes. In the Early Cretaceous, 140–133 Ma, the regional stress field was intense, upwelling asthenospheric mantle started to melt, and alkali basaltic magmas were emplaced in a 400 km long coastal dyke swarm parallel to large linear faults offshore. In the Palaeocene, continental break-up took place and flood basalts (62–60 Ma) were extruded in the Nuussuaq Basin. Large basalt sills and dykes extend the region with Palaeocene activity 150 km southwards and form a link between the Nuussuaq Basin and the Sisimiut Basin offshore. Dykes with ages of 57–51 Ma indicate widespread younger volcanic activity. |
format |
Dataset |
author |
LOTTE M. LARSEN LARRY M. HEAMAN ROBERT A. CREASER ROBERT A. DUNCAN ROBERT FREI MARK HUTCHISON |
author_facet |
LOTTE M. LARSEN LARRY M. HEAMAN ROBERT A. CREASER ROBERT A. DUNCAN ROBERT FREI MARK HUTCHISON |
author_sort |
LOTTE M. LARSEN |
title |
Tectonomagmatic events during stretching and basin formation in the Labrador Sea and the Davis Strait: evidence from age and composition of Mesozoic to Palaeogene dyke swarms in West Greenland |
title_short |
Tectonomagmatic events during stretching and basin formation in the Labrador Sea and the Davis Strait: evidence from age and composition of Mesozoic to Palaeogene dyke swarms in West Greenland |
title_full |
Tectonomagmatic events during stretching and basin formation in the Labrador Sea and the Davis Strait: evidence from age and composition of Mesozoic to Palaeogene dyke swarms in West Greenland |
title_fullStr |
Tectonomagmatic events during stretching and basin formation in the Labrador Sea and the Davis Strait: evidence from age and composition of Mesozoic to Palaeogene dyke swarms in West Greenland |
title_full_unstemmed |
Tectonomagmatic events during stretching and basin formation in the Labrador Sea and the Davis Strait: evidence from age and composition of Mesozoic to Palaeogene dyke swarms in West Greenland |
title_sort |
tectonomagmatic events during stretching and basin formation in the labrador sea and the davis strait: evidence from age and composition of mesozoic to palaeogene dyke swarms in west greenland |
publishDate |
2016 |
url |
https://doi.org/10.6084/m9.figshare.3454733.v1 https://figshare.com/articles/Tectonomagmatic_events_during_stretching_and_basin_formation_in_the_Labrador_Sea_and_the_Davis_Strait_evidence_from_age_and___composition_of_Mesozoic_to_Palaeogene_dyke_swarms_in_West_Greenland/3454733 |
long_lat |
ENVELOPE(-53.674,-53.674,66.939,66.939) ENVELOPE(-51.918,-51.918,66.626,66.626) |
geographic |
Greenland Sisimiut Nuussuaq |
geographic_facet |
Greenland Sisimiut Nuussuaq |
genre |
Davis Strait Greenland Labrador Sea Nuussuaq Sisimiut |
genre_facet |
Davis Strait Greenland Labrador Sea Nuussuaq Sisimiut |
op_relation |
doi:10.6084/m9.figshare.3454733.v1 https://figshare.com/articles/Tectonomagmatic_events_during_stretching_and_basin_formation_in_the_Labrador_Sea_and_the_Davis_Strait_evidence_from_age_and___composition_of_Mesozoic_to_Palaeogene_dyke_swarms_in_West_Greenland/3454733 |
op_rights |
CC BY 4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.6084/m9.figshare.3454733.v1 |
_version_ |
1766396114369511424 |