Isotopic composition and lithic grains concentration of sediment core SI90-09, supplement to: Grousset, Francis E; Cortijo, Elsa; Huon, Sylvain; Herve, Laurence; Richter, Thomas; Burdloff, Didier; Duprat, Josette M; Weber, Oliver (2001): Zooming in on Heinrich layers. Paleoceanography, 16(3), 240-259
Theories explaining the origin of the abrupt, massive discharges of ice-rafted detritus (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 an...
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ftdatacite:10.1594/pangaea.846660 2023-05-15T16:41:30+02:00 Isotopic composition and lithic grains concentration of sediment core SI90-09, supplement to: Grousset, Francis E; Cortijo, Elsa; Huon, Sylvain; Herve, Laurence; Richter, Thomas; Burdloff, Didier; Duprat, Josette M; Weber, Oliver (2001): Zooming in on Heinrich layers. Paleoceanography, 16(3), 240-259 Grousset, Francis E Cortijo, Elsa Huon, Sylvain Herve, Laurence Richter, Thomas Burdloff, Didier Duprat, Josette M Weber, Oliver 2001 application/zip https://dx.doi.org/10.1594/pangaea.846660 https://doi.pangaea.de/10.1594/PANGAEA.846660 en eng PANGAEA - Data Publisher for Earth & Environmental Science https://dx.doi.org/10.1029/2000pa000559 Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 CC-BY Piston corer PALEOCINAT Le Suroît article Supplementary Collection of Datasets Collection 2001 ftdatacite https://doi.org/10.1594/pangaea.846660 https://doi.org/10.1029/2000pa000559 2022-02-09T13:31:34Z Theories explaining the origin of the abrupt, massive discharges of ice-rafted detritus (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, doi:10.1126/science.267.5200.1005; Snoeckx et al., 1999, doi:10.1016/S0025-3227(98)00168-6; Grousset et al., 2000, doi:10.1130/0091-7613(2000)28<123:WTNAHE>2.0.CO;2). 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 d18O 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 foraminafersand with a 3°C 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 H1 and H2, "precursor" IRD came from first Europe/Iceland, followed then by Laurentide-derived IRD. An internal cyclicity can be identified: during H1 and H2, about four to six major, abrupt discharges occurred roughly on a century timescale. The d13C and d15N 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 DataCite Metadata Store (German National Library of Science and Technology) Herve ENVELOPE(-62.000,-62.000,-74.250,-74.250) Huon ENVELOPE(-57.998,-57.998,-63.367,-63.367) Mid-Atlantic Ridge |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
Piston corer PALEOCINAT Le Suroît |
spellingShingle |
Piston corer PALEOCINAT Le Suroît Grousset, Francis E Cortijo, Elsa Huon, Sylvain Herve, Laurence Richter, Thomas Burdloff, Didier Duprat, Josette M Weber, Oliver Isotopic composition and lithic grains concentration of sediment core SI90-09, supplement to: Grousset, Francis E; Cortijo, Elsa; Huon, Sylvain; Herve, Laurence; Richter, Thomas; Burdloff, Didier; Duprat, Josette M; Weber, Oliver (2001): Zooming in on Heinrich layers. Paleoceanography, 16(3), 240-259 |
topic_facet |
Piston corer PALEOCINAT Le Suroît |
description |
Theories explaining the origin of the abrupt, massive discharges of ice-rafted detritus (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, doi:10.1126/science.267.5200.1005; Snoeckx et al., 1999, doi:10.1016/S0025-3227(98)00168-6; Grousset et al., 2000, doi:10.1130/0091-7613(2000)28<123:WTNAHE>2.0.CO;2). 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 d18O 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 foraminafersand with a 3°C 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 H1 and H2, "precursor" IRD came from first Europe/Iceland, followed then by Laurentide-derived IRD. An internal cyclicity can be identified: during H1 and H2, about four to six major, abrupt discharges occurred roughly on a century timescale. The d13C and d15N records reveal that dominant inputs of continent-derived organic matter are associated with IRD within the HLs, hiding the plankton productivity signal. |
format |
Article in Journal/Newspaper |
author |
Grousset, Francis E Cortijo, Elsa Huon, Sylvain Herve, Laurence Richter, Thomas Burdloff, Didier Duprat, Josette M Weber, Oliver |
author_facet |
Grousset, Francis E Cortijo, Elsa Huon, Sylvain Herve, Laurence Richter, Thomas Burdloff, Didier Duprat, Josette M Weber, Oliver |
author_sort |
Grousset, Francis E |
title |
Isotopic composition and lithic grains concentration of sediment core SI90-09, supplement to: Grousset, Francis E; Cortijo, Elsa; Huon, Sylvain; Herve, Laurence; Richter, Thomas; Burdloff, Didier; Duprat, Josette M; Weber, Oliver (2001): Zooming in on Heinrich layers. Paleoceanography, 16(3), 240-259 |
title_short |
Isotopic composition and lithic grains concentration of sediment core SI90-09, supplement to: Grousset, Francis E; Cortijo, Elsa; Huon, Sylvain; Herve, Laurence; Richter, Thomas; Burdloff, Didier; Duprat, Josette M; Weber, Oliver (2001): Zooming in on Heinrich layers. Paleoceanography, 16(3), 240-259 |
title_full |
Isotopic composition and lithic grains concentration of sediment core SI90-09, supplement to: Grousset, Francis E; Cortijo, Elsa; Huon, Sylvain; Herve, Laurence; Richter, Thomas; Burdloff, Didier; Duprat, Josette M; Weber, Oliver (2001): Zooming in on Heinrich layers. Paleoceanography, 16(3), 240-259 |
title_fullStr |
Isotopic composition and lithic grains concentration of sediment core SI90-09, supplement to: Grousset, Francis E; Cortijo, Elsa; Huon, Sylvain; Herve, Laurence; Richter, Thomas; Burdloff, Didier; Duprat, Josette M; Weber, Oliver (2001): Zooming in on Heinrich layers. Paleoceanography, 16(3), 240-259 |
title_full_unstemmed |
Isotopic composition and lithic grains concentration of sediment core SI90-09, supplement to: Grousset, Francis E; Cortijo, Elsa; Huon, Sylvain; Herve, Laurence; Richter, Thomas; Burdloff, Didier; Duprat, Josette M; Weber, Oliver (2001): Zooming in on Heinrich layers. Paleoceanography, 16(3), 240-259 |
title_sort |
isotopic composition and lithic grains concentration of sediment core si90-09, supplement to: grousset, francis e; cortijo, elsa; huon, sylvain; herve, laurence; richter, thomas; burdloff, didier; duprat, josette m; weber, oliver (2001): zooming in on heinrich layers. paleoceanography, 16(3), 240-259 |
publisher |
PANGAEA - Data Publisher for Earth & Environmental Science |
publishDate |
2001 |
url |
https://dx.doi.org/10.1594/pangaea.846660 https://doi.pangaea.de/10.1594/PANGAEA.846660 |
long_lat |
ENVELOPE(-62.000,-62.000,-74.250,-74.250) ENVELOPE(-57.998,-57.998,-63.367,-63.367) |
geographic |
Herve Huon Mid-Atlantic Ridge |
geographic_facet |
Herve Huon Mid-Atlantic Ridge |
genre |
Ice Sheet Iceland North Atlantic |
genre_facet |
Ice Sheet Iceland North Atlantic |
op_relation |
https://dx.doi.org/10.1029/2000pa000559 |
op_rights |
Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/pangaea.846660 https://doi.org/10.1029/2000pa000559 |
_version_ |
1766031941308514304 |