Glacial-interglacial trench supply variation, spreading-ridge subduction, and feedback controls on the Andean margin development at the Chile triple junction area (45-48°S)
International audience During the Chile triple junction (CTJ) cruise (March–April 1997), EM12 bathymetry and seismic reflection data were collected in the vicinity of the Chile triple junction (45‐480S), where an active spreading ridge is being subducted beneath the Andean continental margin. Result...
Published in: | Journal of Geophysical Research: Solid Earth |
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Main Authors: | , , , , , |
Other Authors: | , , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2000
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Online Access: | https://hal.science/hal-02497069 https://hal.science/hal-02497069/document https://hal.science/hal-02497069/file/1999JB900400.pdf https://doi.org/10.1029/1999JB900400 |
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Portail des publications scientifiques de l’Université d’Angers (HAL) |
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[SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics |
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[SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics Bourgois, Jacques Guivel, Christèle Lagabrielle, Yves Calmus, Thierry Boulègue, Jacques Daux, Valérie Glacial-interglacial trench supply variation, spreading-ridge subduction, and feedback controls on the Andean margin development at the Chile triple junction area (45-48°S) |
topic_facet |
[SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics |
description |
International audience During the Chile triple junction (CTJ) cruise (March–April 1997), EM12 bathymetry and seismic reflection data were collected in the vicinity of the Chile triple junction (45‐480S), where an active spreading ridge is being subducted beneath the Andean continental margin. Results show a continental margin development shaped by tectonic processes spanning a spectrum from subduction‐erosion to subduction‐accretion. The Andean continental margin and the Chile trench exhibit a strong segmentation which reflects the slab segmentation and the Chile triple junction migration. Three segments were identified along the Andean continental margin: the presubduction, the synsubduction, and the postsubduction segments, from north to south. Both climate‐induced variations of the sediment supply to the trench and the tectonic reorganization at the Nazca‐Antarctica plate boundary involving postsubduction ridge jump are the two main factors that control the tectonic regime of this continental margin. Along the survey area we infer the succession of two different periods during the last glacial‐interglacial cycle: a glacial period with ice‐rafted detrital discharges restricted to the shoreline area and low river output and a warmer period during which the Andean ice cap retreat allowed the Andes to be drained off. During these warm periods, rapid increase in trench deposition caused the margin to switch from subductionerosion or nonaccretion to subduction‐accretion: (1) along the presubduction segment after the last deglaciation and (2) along the postsubduction segment after the interglacial episode at 130–117 ka. Conversely, a nonaccretion or subduction‐érosion mode characterized the presubduction and postsubduction segments during glacial maximums. The major effects of subduction of the buoyant Chile ridge include a shallow trench which diverts trench sediment supply and tectonic instabilities at the Nazca‐Antarctica plate boundary. We suggest that a postsubduction westward jump of the Chile ridge occurred ... |
author2 |
Institut des Sciences de la Terre de Paris (iSTeP) Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) 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) Institut de Recherche pour le Développement (IRD Nouvelle-Calédonie ) Instituto de Geologia Universidad Nacional Autónoma de México = National Autonomous University of Mexico (UNAM) Laboratoire de Géochimie et Métallogénie Université Pierre et Marie Curie - Paris 6 (UPMC) Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) Géochrononologie Traceurs Archéométrie (GEOTRAC) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) Glaces et Continents, Climats et Isotopes Stables (GLACCIOS) |
format |
Article in Journal/Newspaper |
author |
Bourgois, Jacques Guivel, Christèle Lagabrielle, Yves Calmus, Thierry Boulègue, Jacques Daux, Valérie |
author_facet |
Bourgois, Jacques Guivel, Christèle Lagabrielle, Yves Calmus, Thierry Boulègue, Jacques Daux, Valérie |
author_sort |
Bourgois, Jacques |
title |
Glacial-interglacial trench supply variation, spreading-ridge subduction, and feedback controls on the Andean margin development at the Chile triple junction area (45-48°S) |
title_short |
Glacial-interglacial trench supply variation, spreading-ridge subduction, and feedback controls on the Andean margin development at the Chile triple junction area (45-48°S) |
title_full |
Glacial-interglacial trench supply variation, spreading-ridge subduction, and feedback controls on the Andean margin development at the Chile triple junction area (45-48°S) |
title_fullStr |
Glacial-interglacial trench supply variation, spreading-ridge subduction, and feedback controls on the Andean margin development at the Chile triple junction area (45-48°S) |
title_full_unstemmed |
Glacial-interglacial trench supply variation, spreading-ridge subduction, and feedback controls on the Andean margin development at the Chile triple junction area (45-48°S) |
title_sort |
glacial-interglacial trench supply variation, spreading-ridge subduction, and feedback controls on the andean margin development at the chile triple junction area (45-48°s) |
publisher |
HAL CCSD |
publishDate |
2000 |
url |
https://hal.science/hal-02497069 https://hal.science/hal-02497069/document https://hal.science/hal-02497069/file/1999JB900400.pdf https://doi.org/10.1029/1999JB900400 |
genre |
Antarc* Antarctica Ice cap |
genre_facet |
Antarc* Antarctica Ice cap |
op_source |
ISSN: 2169-9313 EISSN: 2169-9356 Journal of Geophysical Research : Solid Earth https://hal.science/hal-02497069 Journal of Geophysical Research : Solid Earth, 2000, 105 (B4), pp.8355-8386. ⟨10.1029/1999JB900400⟩ |
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op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/1999JB900400 |
container_title |
Journal of Geophysical Research: Solid Earth |
container_volume |
105 |
container_issue |
B4 |
container_start_page |
8355 |
op_container_end_page |
8386 |
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ftunivangershal:oai:HAL:hal-02497069v1 2023-11-05T03:36:46+01:00 Glacial-interglacial trench supply variation, spreading-ridge subduction, and feedback controls on the Andean margin development at the Chile triple junction area (45-48°S) Bourgois, Jacques Guivel, Christèle Lagabrielle, Yves Calmus, Thierry Boulègue, Jacques Daux, Valérie Institut des Sciences de la Terre de Paris (iSTeP) Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) 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) Institut de Recherche pour le Développement (IRD Nouvelle-Calédonie ) Instituto de Geologia Universidad Nacional Autónoma de México = National Autonomous University of Mexico (UNAM) Laboratoire de Géochimie et Métallogénie Université Pierre et Marie Curie - Paris 6 (UPMC) Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) Géochrononologie Traceurs Archéométrie (GEOTRAC) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) Glaces et Continents, Climats et Isotopes Stables (GLACCIOS) 2000 https://hal.science/hal-02497069 https://hal.science/hal-02497069/document https://hal.science/hal-02497069/file/1999JB900400.pdf https://doi.org/10.1029/1999JB900400 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/1999JB900400 hal-02497069 https://hal.science/hal-02497069 https://hal.science/hal-02497069/document https://hal.science/hal-02497069/file/1999JB900400.pdf doi:10.1029/1999JB900400 info:eu-repo/semantics/OpenAccess ISSN: 2169-9313 EISSN: 2169-9356 Journal of Geophysical Research : Solid Earth https://hal.science/hal-02497069 Journal of Geophysical Research : Solid Earth, 2000, 105 (B4), pp.8355-8386. ⟨10.1029/1999JB900400⟩ [SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics info:eu-repo/semantics/article Journal articles 2000 ftunivangershal https://doi.org/10.1029/1999JB900400 2023-10-11T16:19:43Z International audience During the Chile triple junction (CTJ) cruise (March–April 1997), EM12 bathymetry and seismic reflection data were collected in the vicinity of the Chile triple junction (45‐480S), where an active spreading ridge is being subducted beneath the Andean continental margin. Results show a continental margin development shaped by tectonic processes spanning a spectrum from subduction‐erosion to subduction‐accretion. The Andean continental margin and the Chile trench exhibit a strong segmentation which reflects the slab segmentation and the Chile triple junction migration. Three segments were identified along the Andean continental margin: the presubduction, the synsubduction, and the postsubduction segments, from north to south. Both climate‐induced variations of the sediment supply to the trench and the tectonic reorganization at the Nazca‐Antarctica plate boundary involving postsubduction ridge jump are the two main factors that control the tectonic regime of this continental margin. Along the survey area we infer the succession of two different periods during the last glacial‐interglacial cycle: a glacial period with ice‐rafted detrital discharges restricted to the shoreline area and low river output and a warmer period during which the Andean ice cap retreat allowed the Andes to be drained off. During these warm periods, rapid increase in trench deposition caused the margin to switch from subductionerosion or nonaccretion to subduction‐accretion: (1) along the presubduction segment after the last deglaciation and (2) along the postsubduction segment after the interglacial episode at 130–117 ka. Conversely, a nonaccretion or subduction‐érosion mode characterized the presubduction and postsubduction segments during glacial maximums. The major effects of subduction of the buoyant Chile ridge include a shallow trench which diverts trench sediment supply and tectonic instabilities at the Nazca‐Antarctica plate boundary. We suggest that a postsubduction westward jump of the Chile ridge occurred ... Article in Journal/Newspaper Antarc* Antarctica Ice cap Portail des publications scientifiques de l’Université d’Angers (HAL) Journal of Geophysical Research: Solid Earth 105 B4 8355 8386 |