Bond, Gerard C; Heinrich, Hartmut; Broecker, Wallace S; Labeyrie, Laurent D; McManus, Jerry F; Andrews, John T; Huson, S; Jantschik, Ruediger; Clasen, Silke; Simet, Christine; Tedesco, Kathy; Klas, Mieczyslawa; Bonani, Georges; Ivy, Susan (1992): Age determinations on sediment cores from the North Atlantic. PANGAEA, https://doi.org/10.1594/PANGAEA.724543, Supplement to: Bond, GC et al. (1992): Evidence for massive discharges of icebergs into the North Atlantic ocean during the last glacial period. Nature, 360(6401), 245-249, https://doi.org/10.1038/360245a0
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Sediments in the North Atlantic ocean contain as eries of layers that are rich in ice-rafted debris and unusally poor in foraminifera. Here we present evidence that the most recent six of the 'Heinrich layers', deposited between 14,000 and 70,000 years ago, record marked decreases in sea surface temperature and salinity, decreases in the flux of planktonic forminifera to the sediments, and short-lived, massive discharges of icebergs originating in eastern Canada. The path of the icebergs, clearly marked by the presence of ice-rafted detrital carbonate, can be traced for more than 3,000 km - a remarkable distance, attesting to extreme cooling of surface waters and enormous amounts of drifiting ice. The cause of these extreme events is puzzling. They may reflect repated rapid advances of the Laurentide ice sheet, perhaps associated with reductions in air temperatures, yet temperature records from Greenland ice cores appear to exhibit only a weak corresponding signal. Moreover, the 5-10,000-yr intervals between the events are inconsistent with Milankovitch orbital periodicities, raising the question of what the ultimate cause of the postulated cooling may have been.
Median Latitude: 49.954707 * Median Longitude: -26.323204 * South-bound Latitude: 46.000000 * West-bound Longitude: -45.050000 * North-bound Latitude: 54.250000 * East-bound Longitude: -16.830000
Date/Time Start: 1966-08-15T00:00:00 * Date/Time End: 1983-07-22T00:00:00
94-609 * Latitude: 49.877800 * Longitude: -24.238200 * Date/Time: 1983-07-22T00:00:00 * Elevation: -3884.0 m * Penetration: 399.4 m * Recovery: 301.4 m * Location: North Atlantic/FLANK * Campaign: Leg94 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 40 cores; 380.2 m cored; 19.2 m drilled; 79.3 % recovery
HU75-055 * Elevation Start: 0.0 m * Elevation End: 0.0 m * Method/Device: Piston corer (PC) * Comment: Position not given
Datasets listed in this publication series
- Bond, GC; Heinrich, H; Broecker, WS et al. (1992): (Fig. 1) Ice rafted debris and planktic foraminifers of Hole 94-609. https://doi.org/10.1594/PANGAEA.52215
- Bond, GC; Heinrich, H; Broecker, WS et al. (1992): (Table 1) Age determinations of North Atlantic Ocean sediments. https://doi.org/10.1594/PANGAEA.358326
- Bond, GC; Heinrich, H; Broecker, WS et al. (1992): (Table 2) Foraminifera and IRD sand flux estimates for DSDP Hole 94-609. https://doi.org/10.1594/PANGAEA.726081