Zooming in on Heinrich layers
International audience Theories explaining the origin of the abrupt, massive discharges of ice-rafteddetritus (IRD) into the glacial North Atlantic (the Heinrich layers (HLs)) generally point to the Laurentide ice sheet as the sole source of these events, until it was found that the IRDs also origin...
Published in: | Paleoceanography |
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Main Authors: | , , , , , , , |
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Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2001
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Subjects: | |
Online Access: | https://hal.inrae.fr/hal-02680294 https://hal.inrae.fr/hal-02680294/document https://hal.inrae.fr/hal-02680294/file/2000PA000559.pdf https://doi.org/10.1029/2000PA000559 |
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Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
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English |
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OCEANOGRAPHIE PALEONTOLOGIE TECHNIQUE DES TRACEURS [SDV]Life Sciences [q-bio] [SDE]Environmental Sciences |
spellingShingle |
OCEANOGRAPHIE PALEONTOLOGIE TECHNIQUE DES TRACEURS [SDV]Life Sciences [q-bio] [SDE]Environmental Sciences Grousset, F.E. Cortijo, E. Huon, Sylvain Herve, Lucile Richter, T. Burdloff, D. Duprat, Julien Weber, O. Zooming in on Heinrich layers |
topic_facet |
OCEANOGRAPHIE PALEONTOLOGIE TECHNIQUE DES TRACEURS [SDV]Life Sciences [q-bio] [SDE]Environmental Sciences |
description |
International audience Theories explaining the origin of the abrupt, massive discharges of ice-rafteddetritus (IRD) into the glacial North Atlantic (the Heinrich layers (HLs)) generally point to the Laurentide ice sheet as the sole source of these events, until it was found that the IRDs also originated from Icelandic and European ice sheets [Bond and Lotti, 1995; Snoeckx et al., 1999; Grousset et al., 2000]. This apparent contradiction must be reconciled as it raises fundamental questions about the mechanism(s) of HL origin. We have analyzed two-12 cm thick HLs in an ultrahigh-resolution mode (1-2 century intervals) in a mid-Atlantic ridge piston core. The •80 record (N. pachyderma left coiling) reveals strong excursions induced by the melting of the icebergs; these excursions are associated with a strong decrease in the amount of planktic foraminifersand with a 3øC cooling of the surface waters. Counts of coarse detrital grains reveal that IRD are deposited according to a typical sequence (1) volcanic glass, (2) quartz and feldspars, (3) detrital carbonate, that implies a chronology in the melting of the differentpan-Atlantic ice sheets. Sr and Nd isotopic composition confirm that in both Heinrich layers H l and H2, "precursor" IRD came from first Europe/Iceland, followed then by Laurentide-derived IRD. An internal cyclicity can be identified: during H 1 and H2, about four to six major, abrupt discharges occurred roughly on a century timescale. The •13C and •SN records reveal that dominant inputs of continent-derived organic matter are associated with IRD within the HLs, hiding the plankton productivity signal. |
author2 |
Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ) Paléocéanographie (PALEOCEAN) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ) Biogéochimie et écologie des milieux continentaux (Bioemco) Centre National de la Recherche Scientifique (CNRS)-AgroParisTech-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de la Recherche Agronomique (INRA)-École normale supérieure - Paris (ENS Paris) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL) |
format |
Article in Journal/Newspaper |
author |
Grousset, F.E. Cortijo, E. Huon, Sylvain Herve, Lucile Richter, T. Burdloff, D. Duprat, Julien Weber, O. |
author_facet |
Grousset, F.E. Cortijo, E. Huon, Sylvain Herve, Lucile Richter, T. Burdloff, D. Duprat, Julien Weber, O. |
author_sort |
Grousset, F.E. |
title |
Zooming in on Heinrich layers |
title_short |
Zooming in on Heinrich layers |
title_full |
Zooming in on Heinrich layers |
title_fullStr |
Zooming in on Heinrich layers |
title_full_unstemmed |
Zooming in on Heinrich layers |
title_sort |
zooming in on heinrich layers |
publisher |
HAL CCSD |
publishDate |
2001 |
url |
https://hal.inrae.fr/hal-02680294 https://hal.inrae.fr/hal-02680294/document https://hal.inrae.fr/hal-02680294/file/2000PA000559.pdf https://doi.org/10.1029/2000PA000559 |
geographic |
Mid-Atlantic Ridge |
geographic_facet |
Mid-Atlantic Ridge |
genre |
Ice Sheet Iceland North Atlantic |
genre_facet |
Ice Sheet Iceland North Atlantic |
op_source |
ISSN: 0883-8305 Paleoceanography https://hal.inrae.fr/hal-02680294 Paleoceanography, American Geophysical Union, 2001, 16 (3), pp.240-259. ⟨10.1029/2000PA000559⟩ |
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info:eu-repo/semantics/altIdentifier/doi/10.1029/2000PA000559 hal-02680294 https://hal.inrae.fr/hal-02680294 https://hal.inrae.fr/hal-02680294/document https://hal.inrae.fr/hal-02680294/file/2000PA000559.pdf doi:10.1029/2000PA000559 PRODINRA: 63171 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2000PA000559 |
container_title |
Paleoceanography |
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16 |
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3 |
container_start_page |
240 |
op_container_end_page |
259 |
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1766031769555959808 |
spelling |
ftccsdartic:oai:HAL:hal-02680294v1 2023-05-15T16:41:20+02:00 Zooming in on Heinrich layers Grousset, F.E. Cortijo, E. Huon, Sylvain Herve, Lucile Richter, T. Burdloff, D. Duprat, Julien Weber, O. Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ) Paléocéanographie (PALEOCEAN) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ) Biogéochimie et écologie des milieux continentaux (Bioemco) Centre National de la Recherche Scientifique (CNRS)-AgroParisTech-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de la Recherche Agronomique (INRA)-École normale supérieure - Paris (ENS Paris) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL) 2001 https://hal.inrae.fr/hal-02680294 https://hal.inrae.fr/hal-02680294/document https://hal.inrae.fr/hal-02680294/file/2000PA000559.pdf https://doi.org/10.1029/2000PA000559 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/2000PA000559 hal-02680294 https://hal.inrae.fr/hal-02680294 https://hal.inrae.fr/hal-02680294/document https://hal.inrae.fr/hal-02680294/file/2000PA000559.pdf doi:10.1029/2000PA000559 PRODINRA: 63171 info:eu-repo/semantics/OpenAccess ISSN: 0883-8305 Paleoceanography https://hal.inrae.fr/hal-02680294 Paleoceanography, American Geophysical Union, 2001, 16 (3), pp.240-259. ⟨10.1029/2000PA000559⟩ OCEANOGRAPHIE PALEONTOLOGIE TECHNIQUE DES TRACEURS [SDV]Life Sciences [q-bio] [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2001 ftccsdartic https://doi.org/10.1029/2000PA000559 2021-12-19T00:30:46Z International audience Theories explaining the origin of the abrupt, massive discharges of ice-rafteddetritus (IRD) into the glacial North Atlantic (the Heinrich layers (HLs)) generally point to the Laurentide ice sheet as the sole source of these events, until it was found that the IRDs also originated from Icelandic and European ice sheets [Bond and Lotti, 1995; Snoeckx et al., 1999; Grousset et al., 2000]. This apparent contradiction must be reconciled as it raises fundamental questions about the mechanism(s) of HL origin. We have analyzed two-12 cm thick HLs in an ultrahigh-resolution mode (1-2 century intervals) in a mid-Atlantic ridge piston core. The •80 record (N. pachyderma left coiling) reveals strong excursions induced by the melting of the icebergs; these excursions are associated with a strong decrease in the amount of planktic foraminifersand with a 3øC cooling of the surface waters. Counts of coarse detrital grains reveal that IRD are deposited according to a typical sequence (1) volcanic glass, (2) quartz and feldspars, (3) detrital carbonate, that implies a chronology in the melting of the differentpan-Atlantic ice sheets. Sr and Nd isotopic composition confirm that in both Heinrich layers H l and H2, "precursor" IRD came from first Europe/Iceland, followed then by Laurentide-derived IRD. An internal cyclicity can be identified: during H 1 and H2, about four to six major, abrupt discharges occurred roughly on a century timescale. The •13C and •SN records reveal that dominant inputs of continent-derived organic matter are associated with IRD within the HLs, hiding the plankton productivity signal. Article in Journal/Newspaper Ice Sheet Iceland North Atlantic Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Mid-Atlantic Ridge Paleoceanography 16 3 240 259 |