The post-orogenic evolution of the Northeast Greenland Caledonides constrained from apatite fission track analysis and inverse geodynamic modelling
International audience We present new apatite !ssion track (AFT) data from the Northeast Greenland passive margin, between 75.8 and 81°N, where elevations reach over 1000 m and no signs of magmatism related to the opening of the North Atlantic exist. The AFT ages are old, ranging from just less than...
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Format: | Article in Journal/Newspaper |
Language: | English |
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Online Access: | https://hal-insu.archives-ouvertes.fr/insu-00714401 https://doi.org/10.1016/j.tecto.2012.01.018 |
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ftccsdartic:oai:HAL:insu-00714401v1 2023-05-15T16:26:54+02:00 The post-orogenic evolution of the Northeast Greenland Caledonides constrained from apatite fission track analysis and inverse geodynamic modelling Pedersen, V., Nielsen, Soren-Bom Gallagher, Kerry Terre, Temps, Traçage Géosciences Rennes (GR) Centre National de la Recherche Scientifique (CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 1 (UR1) Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Centre National de la Recherche Scientifique (CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 1 (UR1) Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES) 2012 https://hal-insu.archives-ouvertes.fr/insu-00714401 https://doi.org/10.1016/j.tecto.2012.01.018 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.tecto.2012.01.018 insu-00714401 https://hal-insu.archives-ouvertes.fr/insu-00714401 doi:10.1016/j.tecto.2012.01.018 ISSN: 0040-1951 EISSN: 1879-3266 Tectonophysics https://hal-insu.archives-ouvertes.fr/insu-00714401 Tectonophysics, Elsevier, 2012, 530-531, pp.318-330. ⟨10.1016/j.tecto.2012.01.018⟩ Northeast Greenland Fission track analysis Passive margins Topography Erosion [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2012 ftccsdartic https://doi.org/10.1016/j.tecto.2012.01.018 2021-10-24T16:19:19Z International audience We present new apatite !ssion track (AFT) data from the Northeast Greenland passive margin, between 75.8 and 81°N, where elevations reach over 1000 m and no signs of magmatism related to the opening of the North Atlantic exist. The AFT ages are old, ranging from just less than 200 Ma up to more than 350 Ma, and the length distributions are predominantly narrow unimodal, with c-axis projected mean track lengths between 13.3 and 15.0 !m. The passive margin of Northeast Greenland differs from other studied passive margins in terms of AFT age trends, as we observe no correlation with elevation or characteristic trends relative to mean track length. Using these new data and inverse geodynamic modelling, we constrain the evolution in the area since the orogenic collapse of the Caledonides. Exhumation histories are inferred using a uniform stretching model, incorporating variable rates of erosion or deposition, and thermal histories are found by solving the onedimensional transient conduction-advection heat equation. These thermal histories are used with the observed !ssion track data to constrain acceptable strain rate histories and exhumation paths. The results suggest that rifting has been focused mainly in the now offshore regions since ~300 Ma, or in minor local areas onshore, not affecting the sampled areas signi!cantly. The present-day high topography is therefore suggested simply to represent remnants of the original Caledonian topography, modi!ed during early rifting and, other than the "exural isostatic response to erosional unloading, we !nd no need for introducing post-rift related uplift mechanisms. Article in Journal/Newspaper Greenland North Atlantic Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Greenland Tectonophysics 530-531 318 330 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
Northeast Greenland Fission track analysis Passive margins Topography Erosion [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
Northeast Greenland Fission track analysis Passive margins Topography Erosion [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Pedersen, V., Nielsen, Soren-Bom Gallagher, Kerry The post-orogenic evolution of the Northeast Greenland Caledonides constrained from apatite fission track analysis and inverse geodynamic modelling |
topic_facet |
Northeast Greenland Fission track analysis Passive margins Topography Erosion [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience We present new apatite !ssion track (AFT) data from the Northeast Greenland passive margin, between 75.8 and 81°N, where elevations reach over 1000 m and no signs of magmatism related to the opening of the North Atlantic exist. The AFT ages are old, ranging from just less than 200 Ma up to more than 350 Ma, and the length distributions are predominantly narrow unimodal, with c-axis projected mean track lengths between 13.3 and 15.0 !m. The passive margin of Northeast Greenland differs from other studied passive margins in terms of AFT age trends, as we observe no correlation with elevation or characteristic trends relative to mean track length. Using these new data and inverse geodynamic modelling, we constrain the evolution in the area since the orogenic collapse of the Caledonides. Exhumation histories are inferred using a uniform stretching model, incorporating variable rates of erosion or deposition, and thermal histories are found by solving the onedimensional transient conduction-advection heat equation. These thermal histories are used with the observed !ssion track data to constrain acceptable strain rate histories and exhumation paths. The results suggest that rifting has been focused mainly in the now offshore regions since ~300 Ma, or in minor local areas onshore, not affecting the sampled areas signi!cantly. The present-day high topography is therefore suggested simply to represent remnants of the original Caledonian topography, modi!ed during early rifting and, other than the "exural isostatic response to erosional unloading, we !nd no need for introducing post-rift related uplift mechanisms. |
author2 |
Terre, Temps, Traçage Géosciences Rennes (GR) Centre National de la Recherche Scientifique (CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 1 (UR1) Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Centre National de la Recherche Scientifique (CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 1 (UR1) Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES) |
format |
Article in Journal/Newspaper |
author |
Pedersen, V., Nielsen, Soren-Bom Gallagher, Kerry |
author_facet |
Pedersen, V., Nielsen, Soren-Bom Gallagher, Kerry |
author_sort |
Pedersen, V., |
title |
The post-orogenic evolution of the Northeast Greenland Caledonides constrained from apatite fission track analysis and inverse geodynamic modelling |
title_short |
The post-orogenic evolution of the Northeast Greenland Caledonides constrained from apatite fission track analysis and inverse geodynamic modelling |
title_full |
The post-orogenic evolution of the Northeast Greenland Caledonides constrained from apatite fission track analysis and inverse geodynamic modelling |
title_fullStr |
The post-orogenic evolution of the Northeast Greenland Caledonides constrained from apatite fission track analysis and inverse geodynamic modelling |
title_full_unstemmed |
The post-orogenic evolution of the Northeast Greenland Caledonides constrained from apatite fission track analysis and inverse geodynamic modelling |
title_sort |
post-orogenic evolution of the northeast greenland caledonides constrained from apatite fission track analysis and inverse geodynamic modelling |
publisher |
HAL CCSD |
publishDate |
2012 |
url |
https://hal-insu.archives-ouvertes.fr/insu-00714401 https://doi.org/10.1016/j.tecto.2012.01.018 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland North Atlantic |
genre_facet |
Greenland North Atlantic |
op_source |
ISSN: 0040-1951 EISSN: 1879-3266 Tectonophysics https://hal-insu.archives-ouvertes.fr/insu-00714401 Tectonophysics, Elsevier, 2012, 530-531, pp.318-330. ⟨10.1016/j.tecto.2012.01.018⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.tecto.2012.01.018 insu-00714401 https://hal-insu.archives-ouvertes.fr/insu-00714401 doi:10.1016/j.tecto.2012.01.018 |
op_doi |
https://doi.org/10.1016/j.tecto.2012.01.018 |
container_title |
Tectonophysics |
container_volume |
530-531 |
container_start_page |
318 |
op_container_end_page |
330 |
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1766015914518511616 |