Detecting the thermal aureole of a magmatic intrusion in immature to mature sediments: a case study in the East Greenland Basin (73◦N)
International audience The Cretaceous and Triassic argillaceous rocks from the passive margin of Greenland have been investigated in order to detect the thermal aureole of magmatic intrusions, ranging from metric dyke to kilometric syenite pluton. Rock-Eval data (Tmax generally <468 ◦C), vitrinit...
Published in: | Geophysical Journal International |
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Main Authors: | , , , , |
Other Authors: | , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2014
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Subjects: | |
Online Access: | https://hal.archives-ouvertes.fr/hal-00903412 https://hal.archives-ouvertes.fr/hal-00903412/document https://hal.archives-ouvertes.fr/hal-00903412/file/2013_Aubourg_Groenland%20GJI_ADep.pdf https://doi.org/10.1093/gji/ggt396 |
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ftunivnantes:oai:HAL:hal-00903412v1 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
Continental margins: divergent Magnetic mineralogy and petrology Pluton emplacement Arctic region [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics |
spellingShingle |
Continental margins: divergent Magnetic mineralogy and petrology Pluton emplacement Arctic region [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics Aubourg, Charles Techer, Isabelle Geoffroy, Laurent Clauer, Norbert Baudin, François Detecting the thermal aureole of a magmatic intrusion in immature to mature sediments: a case study in the East Greenland Basin (73◦N) |
topic_facet |
Continental margins: divergent Magnetic mineralogy and petrology Pluton emplacement Arctic region [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics |
description |
International audience The Cretaceous and Triassic argillaceous rocks from the passive margin of Greenland have been investigated in order to detect the thermal aureole of magmatic intrusions, ranging from metric dyke to kilometric syenite pluton. Rock-Eval data (Tmax generally <468 ◦C), vitrinite reflectance data (R₀ < 0.9 per cent) and illite cristallinity data (ICI > 0.3), all indicate a maximum of 5km burial for the argillaceous rocks whatever the distance to an intrusion. The K-Ar dating of the clays <2 μm fraction suggests that illites are mostly detrital, except near magmatic intrusions where younger ages are recorded. To get more information about the extent of the thermal aureole, rock magnetism data were determined. At distance away from the thermal aureole of the syenite intrusion, Triassic argillaceous rocks reveal a standard magnetic assemblage compatible with their burial (R₀ ∼ 0.4 percent). It is constituted essentially by neoformed stoichiometric magnetite (Fe₃O₄. In contrast, within the thermal aureole of the magmatic intrusions, the Cretaceous argillaceous rocks contain micron-sized pyrrhotite (Fe₇S₈, firmly identified through the recognition of Besnus transition at 35K. The thermal demagnetization of natural remanence carried by this pyrrhotite shows a diagnostic 'square shouldered' pattern, indicating a narrow grain size distribution of pyrrhotite. The extension of this diagnostic pyrrhotite maps a ∼10-km-thick aureole around the syenitic pluton. Away from this aureole, the magnetic assemblage is diagnostic of those found in argillaceous rocks where organic matter is mature. |
author2 |
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) Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE) Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Domaines Océaniques (LDO) Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Observatoire des Sciences de l'Univers-Institut d'écologie et environnement-Centre National de la Recherche Scientifique (CNRS) Laboratoire d'Hydrologie et de Géochimie de Strasbourg (LHyGeS) Ecole et Observatoire des Sciences de la Terre (EOST) Université de Strasbourg (UNISTRA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-École Nationale du Génie de l'Eau et de l'Environnement de Strasbourg (ENGEES)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Institut des Sciences de la Terre de Paris (iSTeP) Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Aubourg, Charles Techer, Isabelle Geoffroy, Laurent Clauer, Norbert Baudin, François |
author_facet |
Aubourg, Charles Techer, Isabelle Geoffroy, Laurent Clauer, Norbert Baudin, François |
author_sort |
Aubourg, Charles |
title |
Detecting the thermal aureole of a magmatic intrusion in immature to mature sediments: a case study in the East Greenland Basin (73◦N) |
title_short |
Detecting the thermal aureole of a magmatic intrusion in immature to mature sediments: a case study in the East Greenland Basin (73◦N) |
title_full |
Detecting the thermal aureole of a magmatic intrusion in immature to mature sediments: a case study in the East Greenland Basin (73◦N) |
title_fullStr |
Detecting the thermal aureole of a magmatic intrusion in immature to mature sediments: a case study in the East Greenland Basin (73◦N) |
title_full_unstemmed |
Detecting the thermal aureole of a magmatic intrusion in immature to mature sediments: a case study in the East Greenland Basin (73◦N) |
title_sort |
detecting the thermal aureole of a magmatic intrusion in immature to mature sediments: a case study in the east greenland basin (73◦n) |
publisher |
HAL CCSD |
publishDate |
2014 |
url |
https://hal.archives-ouvertes.fr/hal-00903412 https://hal.archives-ouvertes.fr/hal-00903412/document https://hal.archives-ouvertes.fr/hal-00903412/file/2013_Aubourg_Groenland%20GJI_ADep.pdf https://doi.org/10.1093/gji/ggt396 |
long_lat |
ENVELOPE(-5.000,-5.000,73.500,73.500) |
geographic |
Arctic Greenland Greenland Basin |
geographic_facet |
Arctic Greenland Greenland Basin |
genre |
Arctic East Greenland Greenland |
genre_facet |
Arctic East Greenland Greenland |
op_source |
ISSN: 0956-540X EISSN: 1365-246X Geophysical Journal International https://hal.archives-ouvertes.fr/hal-00903412 Geophysical Journal International, Oxford University Press (OUP), 2014, 196 (1), pp.160-174. ⟨10.1093/gji/ggt396⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1093/gji/ggt396 hal-00903412 https://hal.archives-ouvertes.fr/hal-00903412 https://hal.archives-ouvertes.fr/hal-00903412/document https://hal.archives-ouvertes.fr/hal-00903412/file/2013_Aubourg_Groenland%20GJI_ADep.pdf doi:10.1093/gji/ggt396 |
op_rights |
http://creativecommons.org/licenses/by-nc-nd/ info:eu-repo/semantics/OpenAccess |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.1093/gji/ggt396 |
container_title |
Geophysical Journal International |
container_volume |
196 |
container_issue |
1 |
container_start_page |
160 |
op_container_end_page |
174 |
_version_ |
1766343946793910272 |
spelling |
ftunivnantes:oai:HAL:hal-00903412v1 2023-05-15T15:13:23+02:00 Detecting the thermal aureole of a magmatic intrusion in immature to mature sediments: a case study in the East Greenland Basin (73◦N) Aubourg, Charles Techer, Isabelle Geoffroy, Laurent Clauer, Norbert Baudin, François 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) Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE) Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Domaines Océaniques (LDO) Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Observatoire des Sciences de l'Univers-Institut d'écologie et environnement-Centre National de la Recherche Scientifique (CNRS) Laboratoire d'Hydrologie et de Géochimie de Strasbourg (LHyGeS) Ecole et Observatoire des Sciences de la Terre (EOST) Université de Strasbourg (UNISTRA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-École Nationale du Génie de l'Eau et de l'Environnement de Strasbourg (ENGEES)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Institut des Sciences de la Terre de Paris (iSTeP) Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) 2014 https://hal.archives-ouvertes.fr/hal-00903412 https://hal.archives-ouvertes.fr/hal-00903412/document https://hal.archives-ouvertes.fr/hal-00903412/file/2013_Aubourg_Groenland%20GJI_ADep.pdf https://doi.org/10.1093/gji/ggt396 en eng HAL CCSD Oxford University Press (OUP) info:eu-repo/semantics/altIdentifier/doi/10.1093/gji/ggt396 hal-00903412 https://hal.archives-ouvertes.fr/hal-00903412 https://hal.archives-ouvertes.fr/hal-00903412/document https://hal.archives-ouvertes.fr/hal-00903412/file/2013_Aubourg_Groenland%20GJI_ADep.pdf doi:10.1093/gji/ggt396 http://creativecommons.org/licenses/by-nc-nd/ info:eu-repo/semantics/OpenAccess CC-BY-NC-ND ISSN: 0956-540X EISSN: 1365-246X Geophysical Journal International https://hal.archives-ouvertes.fr/hal-00903412 Geophysical Journal International, Oxford University Press (OUP), 2014, 196 (1), pp.160-174. ⟨10.1093/gji/ggt396⟩ Continental margins: divergent Magnetic mineralogy and petrology Pluton emplacement Arctic region [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics info:eu-repo/semantics/article Journal articles 2014 ftunivnantes https://doi.org/10.1093/gji/ggt396 2022-11-09T02:03:27Z International audience The Cretaceous and Triassic argillaceous rocks from the passive margin of Greenland have been investigated in order to detect the thermal aureole of magmatic intrusions, ranging from metric dyke to kilometric syenite pluton. Rock-Eval data (Tmax generally <468 ◦C), vitrinite reflectance data (R₀ < 0.9 per cent) and illite cristallinity data (ICI > 0.3), all indicate a maximum of 5km burial for the argillaceous rocks whatever the distance to an intrusion. The K-Ar dating of the clays <2 μm fraction suggests that illites are mostly detrital, except near magmatic intrusions where younger ages are recorded. To get more information about the extent of the thermal aureole, rock magnetism data were determined. At distance away from the thermal aureole of the syenite intrusion, Triassic argillaceous rocks reveal a standard magnetic assemblage compatible with their burial (R₀ ∼ 0.4 percent). It is constituted essentially by neoformed stoichiometric magnetite (Fe₃O₄. In contrast, within the thermal aureole of the magmatic intrusions, the Cretaceous argillaceous rocks contain micron-sized pyrrhotite (Fe₇S₈, firmly identified through the recognition of Besnus transition at 35K. The thermal demagnetization of natural remanence carried by this pyrrhotite shows a diagnostic 'square shouldered' pattern, indicating a narrow grain size distribution of pyrrhotite. The extension of this diagnostic pyrrhotite maps a ∼10-km-thick aureole around the syenitic pluton. Away from this aureole, the magnetic assemblage is diagnostic of those found in argillaceous rocks where organic matter is mature. Article in Journal/Newspaper Arctic East Greenland Greenland Université de Nantes: HAL-UNIV-NANTES Arctic Greenland Greenland Basin ENVELOPE(-5.000,-5.000,73.500,73.500) Geophysical Journal International 196 1 160 174 |