1.80–1.75 Ga granite suites in the west Troms Basement Complex, northern Norway: Palaeoproterozoic magma emplacement during advancing accretionary orogeny, from field observations
International audience The Ersfjord Granite is part of a suite of c.1.80–1.75 Ga syeno-granites in the West Troms Basement Complex, northern Norway, presumed to belong to the Transscandinavian Igneous Belt (TIB-1) in the Fennoscandian Shield. Previous data suggest the granite formed post-collisional...
Published in: | Precambrian Research |
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Main Authors: | , , , , |
Other Authors: | , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2022
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Online Access: | https://insu.hal.science/insu-03619235 https://insu.hal.science/insu-03619235/document https://insu.hal.science/insu-03619235/file/Bergh_et_al_2022_TEXT_corrLA.pdf https://doi.org/10.1016/j.precamres.2022.106640 |
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ftccsdartic:oai:HAL:insu-03619235v1 |
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record_format |
openpolar |
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 |
1.80–1.75 Ga TIB-1 related granites Extensional sill intrusions syn-tectonic thrust emplacement (D1) Axial-planar dykes (D2) Transpressive dykes (D3) Advancing accretionary orogen [SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
1.80–1.75 Ga TIB-1 related granites Extensional sill intrusions syn-tectonic thrust emplacement (D1) Axial-planar dykes (D2) Transpressive dykes (D3) Advancing accretionary orogen [SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Bergh, S.G. Haaland, L. Arbaret, Laurent Coint, N. Forien, M. 1.80–1.75 Ga granite suites in the west Troms Basement Complex, northern Norway: Palaeoproterozoic magma emplacement during advancing accretionary orogeny, from field observations |
topic_facet |
1.80–1.75 Ga TIB-1 related granites Extensional sill intrusions syn-tectonic thrust emplacement (D1) Axial-planar dykes (D2) Transpressive dykes (D3) Advancing accretionary orogen [SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience The Ersfjord Granite is part of a suite of c.1.80–1.75 Ga syeno-granites in the West Troms Basement Complex, northern Norway, presumed to belong to the Transscandinavian Igneous Belt (TIB-1) in the Fennoscandian Shield. Previous data suggest the granite formed post-collisional and ascended as a batholith pluton from a source generated by delamination of mafic-intermediate lower crust. We argue that the Ersfjord Granite was emplaced initially (c. 1.80 Ga) as multiple tabular sills in an extensional setting, then as successive melt injections (c. 1.78–1.75 Ga) in an evolving Andean/Cordilleran type accretionary orogen at the waning stages of the Svecofennian orogen. Field observations indicate melt ascent initiated as successive sills (EG-I) into well-foliated Meso/Neoarchaean TTG gneisses. Some sills preserved a magmatic layering, others injected and assimilated the host rock gneisses leaving pendants of mafic gneiss/migmatite residuum in between the granite sills. The first tectonic patches of melts (EG-II) ascended into the middle/upper crust along regional shear zones and injected into ductile imbricate thrust stacks (D1 event) during NE-SW directed crustal shortening and medium grade P-T conditions, using the sills and ancestor migmatite pendants as melt pathways. Then the tabular EG-I and II granite sheets and adjacent gneisses were coaxially folded by upright macro-folds (D2 event) and steep, granitic pegmatite dyke swarms (EG-III) intruded parallel to the fold axial surface and in related D2 thrusts, at low grade metamorphic conditions. The final melt emplacement (D3 event) included granite pegmatite dykes and sills (EG-IV) along subvertical D3 fold limbs and steep strike-slip shear zones. Our provisional extension, and successive advancing accretionary orogenic emplacement model for the Ersfjord Granite may explain ascent of many other TIB-1 magmas in the Fennoscandian Shield. |
author2 |
University of Tromsø (UiT) Norwegian University of Science and Technology Trondheim (NTNU) Norwegian University of Science and Technology (NTNU) Institut des Sciences de la Terre d'Orléans - UMR7327 (ISTO) Bureau de Recherches Géologiques et Minières (BRGM) (BRGM)-Observatoire des Sciences de l'Univers en région Centre (OSUC) Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS) Magma - UMR7327 Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Bureau de Recherches Géologiques et Minières (BRGM) (BRGM)-Observatoire des Sciences de l'Univers en région Centre (OSUC) Geological Survey of Norway (NGU) |
format |
Article in Journal/Newspaper |
author |
Bergh, S.G. Haaland, L. Arbaret, Laurent Coint, N. Forien, M. |
author_facet |
Bergh, S.G. Haaland, L. Arbaret, Laurent Coint, N. Forien, M. |
author_sort |
Bergh, S.G. |
title |
1.80–1.75 Ga granite suites in the west Troms Basement Complex, northern Norway: Palaeoproterozoic magma emplacement during advancing accretionary orogeny, from field observations |
title_short |
1.80–1.75 Ga granite suites in the west Troms Basement Complex, northern Norway: Palaeoproterozoic magma emplacement during advancing accretionary orogeny, from field observations |
title_full |
1.80–1.75 Ga granite suites in the west Troms Basement Complex, northern Norway: Palaeoproterozoic magma emplacement during advancing accretionary orogeny, from field observations |
title_fullStr |
1.80–1.75 Ga granite suites in the west Troms Basement Complex, northern Norway: Palaeoproterozoic magma emplacement during advancing accretionary orogeny, from field observations |
title_full_unstemmed |
1.80–1.75 Ga granite suites in the west Troms Basement Complex, northern Norway: Palaeoproterozoic magma emplacement during advancing accretionary orogeny, from field observations |
title_sort |
1.80–1.75 ga granite suites in the west troms basement complex, northern norway: palaeoproterozoic magma emplacement during advancing accretionary orogeny, from field observations |
publisher |
HAL CCSD |
publishDate |
2022 |
url |
https://insu.hal.science/insu-03619235 https://insu.hal.science/insu-03619235/document https://insu.hal.science/insu-03619235/file/Bergh_et_al_2022_TEXT_corrLA.pdf https://doi.org/10.1016/j.precamres.2022.106640 |
geographic |
Norway |
geographic_facet |
Norway |
genre |
Ersfjord Fennoscandian Northern Norway Troms |
genre_facet |
Ersfjord Fennoscandian Northern Norway Troms |
op_source |
ISSN: 0301-9268 Precambrian Research https://insu.hal.science/insu-03619235 Precambrian Research, 2022, 374, pp.106640. ⟨10.1016/j.precamres.2022.106640⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.precamres.2022.106640 insu-03619235 https://insu.hal.science/insu-03619235 https://insu.hal.science/insu-03619235/document https://insu.hal.science/insu-03619235/file/Bergh_et_al_2022_TEXT_corrLA.pdf doi:10.1016/j.precamres.2022.106640 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1016/j.precamres.2022.106640 |
container_title |
Precambrian Research |
container_volume |
374 |
container_start_page |
106640 |
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1788061051631173632 |
spelling |
ftccsdartic:oai:HAL:insu-03619235v1 2024-01-14T10:06:36+01:00 1.80–1.75 Ga granite suites in the west Troms Basement Complex, northern Norway: Palaeoproterozoic magma emplacement during advancing accretionary orogeny, from field observations Bergh, S.G. Haaland, L. Arbaret, Laurent Coint, N. Forien, M. University of Tromsø (UiT) Norwegian University of Science and Technology Trondheim (NTNU) Norwegian University of Science and Technology (NTNU) Institut des Sciences de la Terre d'Orléans - UMR7327 (ISTO) Bureau de Recherches Géologiques et Minières (BRGM) (BRGM)-Observatoire des Sciences de l'Univers en région Centre (OSUC) Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS) Magma - UMR7327 Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Bureau de Recherches Géologiques et Minières (BRGM) (BRGM)-Observatoire des Sciences de l'Univers en région Centre (OSUC) Geological Survey of Norway (NGU) 2022-06 https://insu.hal.science/insu-03619235 https://insu.hal.science/insu-03619235/document https://insu.hal.science/insu-03619235/file/Bergh_et_al_2022_TEXT_corrLA.pdf https://doi.org/10.1016/j.precamres.2022.106640 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.precamres.2022.106640 insu-03619235 https://insu.hal.science/insu-03619235 https://insu.hal.science/insu-03619235/document https://insu.hal.science/insu-03619235/file/Bergh_et_al_2022_TEXT_corrLA.pdf doi:10.1016/j.precamres.2022.106640 info:eu-repo/semantics/OpenAccess ISSN: 0301-9268 Precambrian Research https://insu.hal.science/insu-03619235 Precambrian Research, 2022, 374, pp.106640. ⟨10.1016/j.precamres.2022.106640⟩ 1.80–1.75 Ga TIB-1 related granites Extensional sill intrusions syn-tectonic thrust emplacement (D1) Axial-planar dykes (D2) Transpressive dykes (D3) Advancing accretionary orogen [SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2022 ftccsdartic https://doi.org/10.1016/j.precamres.2022.106640 2023-12-17T00:21:00Z International audience The Ersfjord Granite is part of a suite of c.1.80–1.75 Ga syeno-granites in the West Troms Basement Complex, northern Norway, presumed to belong to the Transscandinavian Igneous Belt (TIB-1) in the Fennoscandian Shield. Previous data suggest the granite formed post-collisional and ascended as a batholith pluton from a source generated by delamination of mafic-intermediate lower crust. We argue that the Ersfjord Granite was emplaced initially (c. 1.80 Ga) as multiple tabular sills in an extensional setting, then as successive melt injections (c. 1.78–1.75 Ga) in an evolving Andean/Cordilleran type accretionary orogen at the waning stages of the Svecofennian orogen. Field observations indicate melt ascent initiated as successive sills (EG-I) into well-foliated Meso/Neoarchaean TTG gneisses. Some sills preserved a magmatic layering, others injected and assimilated the host rock gneisses leaving pendants of mafic gneiss/migmatite residuum in between the granite sills. The first tectonic patches of melts (EG-II) ascended into the middle/upper crust along regional shear zones and injected into ductile imbricate thrust stacks (D1 event) during NE-SW directed crustal shortening and medium grade P-T conditions, using the sills and ancestor migmatite pendants as melt pathways. Then the tabular EG-I and II granite sheets and adjacent gneisses were coaxially folded by upright macro-folds (D2 event) and steep, granitic pegmatite dyke swarms (EG-III) intruded parallel to the fold axial surface and in related D2 thrusts, at low grade metamorphic conditions. The final melt emplacement (D3 event) included granite pegmatite dykes and sills (EG-IV) along subvertical D3 fold limbs and steep strike-slip shear zones. Our provisional extension, and successive advancing accretionary orogenic emplacement model for the Ersfjord Granite may explain ascent of many other TIB-1 magmas in the Fennoscandian Shield. Article in Journal/Newspaper Ersfjord Fennoscandian Northern Norway Troms Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Norway Precambrian Research 374 106640 |