Stress fields acting during lithosphere breakup above a melting mantle: A case example in West Greenland
International audience We characterize and map the stress fields acting during plate breakup along the West Greenland volcanic margin. The determination of interpolated stress fields is based on an inversion of fault-slip data sets and magma-driven fractures, crosscutting mainly an exposed inner sea...
Published in: | Tectonophysics |
---|---|
Main Authors: | , , , , , , |
Other Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2012
|
Subjects: | |
Online Access: | https://insu.hal.science/insu-00663881 https://doi.org/10.1016/j.tecto.2011.11.020 |
id |
ftinsu:oai:HAL:insu-00663881v1 |
---|---|
record_format |
openpolar |
spelling |
ftinsu:oai:HAL:insu-00663881v1 2023-11-12T04:14:51+01:00 Stress fields acting during lithosphere breakup above a melting mantle: A case example in West Greenland Abdelmalak, M., M. Geoffroy, Laurent Angelier, Jacques Bonin, B. Callot, Jean-Paul Gélard, Jean-Pierre Aubourg, Charles Laboratoire de Planétologie et Géodynamique UMR 6112 (LPG) Université d'Angers (UA)-Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST) Université de Nantes (UN)-Université de Nantes (UN)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Interactions et dynamique des environnements de surface (IDES) Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Laboratoire des Fluides Complexes et leurs Réservoirs (LFCR) TOTAL FINA ELF-Université de Pau et des Pays de l'Adour (UPPA)-Centre National de la Recherche Scientifique (CNRS) 2012-12-18 https://insu.hal.science/insu-00663881 https://doi.org/10.1016/j.tecto.2011.11.020 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.tecto.2011.11.020 insu-00663881 https://insu.hal.science/insu-00663881 doi:10.1016/j.tecto.2011.11.020 ISSN: 0040-1951 EISSN: 1879-3266 Tectonophysics https://insu.hal.science/insu-00663881 Tectonophysics, 2012, 158, pp.132-143. ⟨10.1016/j.tecto.2011.11.020⟩ Stress fields Extension Volcanic margin Breakup West Greenland [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2012 ftinsu https://doi.org/10.1016/j.tecto.2011.11.020 2023-11-01T17:22:30Z International audience We characterize and map the stress fields acting during plate breakup along the West Greenland volcanic margin. The determination of interpolated stress fields is based on an inversion of fault-slip data sets and magma-driven fractures, crosscutting mainly an exposed inner seaward-dipping basaltic wedge (i.e., SDRi: inner Seaward Dipping Reflectors). This SDRi is segmented along-strike, with differently oriented segments. Relative chronology of stress fields is inferred from published age results on oriented dykes. We identify two distinct tectonic episodes (P1 and P2) with a P1-P2 change over at ~ 54 Ma, i.e. during magnetic chron C24R. P1 is syn-magmatic and purely extensional. It is associated with the major crustal stretching event affecting the margin. P1 probably acted as early as the Late Palaeocene. This stress field was first homogeneous with the minimum principal stress σ3 trending ~ N060E, defining a P1A stage. During development of the SDRi, σ3 locally reoriented to become orthogonal to each margin segment and, thus, to the continentward-dipping detachment faults bounding the SDRi (P1B). P1 is coeval with lithosphere breakup and is associated with an extension orthogonal to the Labrador-Baffin axis, which is inherited from the Mesozoic. A regional and radical change of σ3 to a ~ NS trend takes place during P2, which follows on immediately from P1. P2 is also syn-magmatic. It is associated with only minor extension. σ3 runs parallel to the North American (NAM)/Greenland (GR) kinematic vector from C24R to C13. We establish therefore that the minimum horizontal stress σ3 for P1 and P2 is parallel to the relative displacement of Greenland related to NAM but not to its absolute displacement during the Tertiary. Taking into account those results as well as variations in magma chemistry from P1 to P2, we suggest that tectonic stresses at a volcanic margin could arise from the local dynamics of the melting mantle. Article in Journal/Newspaper Baffin Greenland Institut national des sciences de l'Univers: HAL-INSU Greenland Tectonophysics 581 132 143 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
Stress fields Extension Volcanic margin Breakup West Greenland [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
Stress fields Extension Volcanic margin Breakup West Greenland [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Abdelmalak, M., M. Geoffroy, Laurent Angelier, Jacques Bonin, B. Callot, Jean-Paul Gélard, Jean-Pierre Aubourg, Charles Stress fields acting during lithosphere breakup above a melting mantle: A case example in West Greenland |
topic_facet |
Stress fields Extension Volcanic margin Breakup West Greenland [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience We characterize and map the stress fields acting during plate breakup along the West Greenland volcanic margin. The determination of interpolated stress fields is based on an inversion of fault-slip data sets and magma-driven fractures, crosscutting mainly an exposed inner seaward-dipping basaltic wedge (i.e., SDRi: inner Seaward Dipping Reflectors). This SDRi is segmented along-strike, with differently oriented segments. Relative chronology of stress fields is inferred from published age results on oriented dykes. We identify two distinct tectonic episodes (P1 and P2) with a P1-P2 change over at ~ 54 Ma, i.e. during magnetic chron C24R. P1 is syn-magmatic and purely extensional. It is associated with the major crustal stretching event affecting the margin. P1 probably acted as early as the Late Palaeocene. This stress field was first homogeneous with the minimum principal stress σ3 trending ~ N060E, defining a P1A stage. During development of the SDRi, σ3 locally reoriented to become orthogonal to each margin segment and, thus, to the continentward-dipping detachment faults bounding the SDRi (P1B). P1 is coeval with lithosphere breakup and is associated with an extension orthogonal to the Labrador-Baffin axis, which is inherited from the Mesozoic. A regional and radical change of σ3 to a ~ NS trend takes place during P2, which follows on immediately from P1. P2 is also syn-magmatic. It is associated with only minor extension. σ3 runs parallel to the North American (NAM)/Greenland (GR) kinematic vector from C24R to C13. We establish therefore that the minimum horizontal stress σ3 for P1 and P2 is parallel to the relative displacement of Greenland related to NAM but not to its absolute displacement during the Tertiary. Taking into account those results as well as variations in magma chemistry from P1 to P2, we suggest that tectonic stresses at a volcanic margin could arise from the local dynamics of the melting mantle. |
author2 |
Laboratoire de Planétologie et Géodynamique UMR 6112 (LPG) Université d'Angers (UA)-Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST) Université de Nantes (UN)-Université de Nantes (UN)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Interactions et dynamique des environnements de surface (IDES) Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Laboratoire des Fluides Complexes et leurs Réservoirs (LFCR) TOTAL FINA ELF-Université de Pau et des Pays de l'Adour (UPPA)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Abdelmalak, M., M. Geoffroy, Laurent Angelier, Jacques Bonin, B. Callot, Jean-Paul Gélard, Jean-Pierre Aubourg, Charles |
author_facet |
Abdelmalak, M., M. Geoffroy, Laurent Angelier, Jacques Bonin, B. Callot, Jean-Paul Gélard, Jean-Pierre Aubourg, Charles |
author_sort |
Abdelmalak, M., M. |
title |
Stress fields acting during lithosphere breakup above a melting mantle: A case example in West Greenland |
title_short |
Stress fields acting during lithosphere breakup above a melting mantle: A case example in West Greenland |
title_full |
Stress fields acting during lithosphere breakup above a melting mantle: A case example in West Greenland |
title_fullStr |
Stress fields acting during lithosphere breakup above a melting mantle: A case example in West Greenland |
title_full_unstemmed |
Stress fields acting during lithosphere breakup above a melting mantle: A case example in West Greenland |
title_sort |
stress fields acting during lithosphere breakup above a melting mantle: a case example in west greenland |
publisher |
HAL CCSD |
publishDate |
2012 |
url |
https://insu.hal.science/insu-00663881 https://doi.org/10.1016/j.tecto.2011.11.020 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Baffin Greenland |
genre_facet |
Baffin Greenland |
op_source |
ISSN: 0040-1951 EISSN: 1879-3266 Tectonophysics https://insu.hal.science/insu-00663881 Tectonophysics, 2012, 158, pp.132-143. ⟨10.1016/j.tecto.2011.11.020⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.tecto.2011.11.020 insu-00663881 https://insu.hal.science/insu-00663881 doi:10.1016/j.tecto.2011.11.020 |
op_doi |
https://doi.org/10.1016/j.tecto.2011.11.020 |
container_title |
Tectonophysics |
container_volume |
581 |
container_start_page |
132 |
op_container_end_page |
143 |
_version_ |
1782332388428218368 |