Not logged in
PANGAEA.
Data Publisher for Earth & Environmental Science

Grousset, Francis E; Cortijo, Elsa; Huon, Sylvain; Herve, Laurence; Richter, Thomas; Burdloff, Didier; Duprat, Josette M; Weber, Oliver (2001): Isotopic composition and lithic grains concentration of sediment core SI90-09 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.846660, Supplement to: Grousset, FE et al. (2001): Zooming in on Heinrich layers. Paleoceanography, 16(3), 240-259, https://doi.org/10.1029/2000PA000559

Always quote citation above when using data! You can download the citation in several formats below.

RIS CitationBibTeX CitationShow MapGoogle Earth

Abstract:
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.
Coverage:
Latitude: 43.786667 * Longitude: -31.748333
Date/Time Start: 1990-01-01T00:00:00 * Date/Time End: 1990-01-01T00:00:00
Event(s):
SU90-09 * Latitude: 43.786667 * Longitude: -31.748333 * Date/Time: 1990-01-01T00:00:00 * Elevation: -3375.0 m * Recovery: 9.3 m * Location: North Atlantic * Campaign: PALEOCINAT * Basis: Le Suroît * Method/Device: Piston corer (PC)
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
4 datasets

Download Data

Download ZIP file containing all datasets as tab-delimited text — use the following character encoding:

Datasets listed in this publication series

  1. Grousset, FE; Cortijo, E; Huon, S et al. (2001): (Table 4) C and N abundance and isotopic composition of the carbonate-free fine fraction in sediment core SU90-09. https://doi.org/10.1594/PANGAEA.846664
  2. Grousset, FE; Cortijo, E; Huon, S et al. (2002): (Table 1) Abundance of planktonic foraminifera, Neogloboquadrina pachyderma δ¹⁸O values and summer SST for sediment core SU90-09. https://doi.org/10.1594/PANGAEA.846655
  3. Grousset, FE; Cortijo, E; Huon, S et al. (2002): (Table 2) Abundance of lithic grains in the carbonate-free coarse fraction in sediment core SU90-09. https://doi.org/10.1594/PANGAEA.846656
  4. Grousset, FE; Cortijo, E; Huon, S et al. (2001): (Table 3) Sr and Nd isotopic composition of the carbonate-free coarse fraction in sediment core SU90-09. https://doi.org/10.1594/PANGAEA.846659