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Evidence from 40Ar/39Ar Ages of Individual Hornblende Grains for Varying Laurentide Sources of Iceberg Discharges 22,000 to 10,500 yr B.P.

Published online by Cambridge University Press:  20 January 2017

Sidney R. Hemming ,
Gerard C. Bond ,
Wallace S. Broecker ,
Warren D. Sharp  and
Mieczyslawa Klas-Mendelson
Sidney R. Hemming
Affiliation:
Lamont-Doherty Earth Observatory of Columbia University and Department of Earth and Environmental Sciences, Route 9W, Palisades, New York, 10964
Gerard C. Bond
Affiliation:
Lamont-Doherty Earth Observatory of Columbia University, Route 9W, Palisades, New York, 10964
Wallace S. Broecker
Affiliation:
Lamont-Doherty Earth Observatory of Columbia University and Department of Earth and Environmental Sciences, Route 9W, Palisades, New York, 10964
Warren D. Sharp
Affiliation:
Berkeley Geochronology Center, 2455 Ridge Road, Berkeley, California, 94709
Mieczyslawa Klas-Mendelson
Affiliation:
Lamont-Doherty Earth Observatory of Columbia University, Route 9W, Palisades, New York, 10964
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Abstract

The abundance and lithic content of ice rafted detritus in glacial North Atlantic sediment cores vary abruptly on millennial time scales that have been correlated to Dansgaard-Oeschger cycles in the Greenland ice cores. There is growing evidence that various ice sheet outlets contributed increased iceberg fluxes at multiple discrete intervals, and the relative timing of iceberg discharges from different sources is important for understanding interactions between oceans and ice sheets. We present a provenance study based on 40Ar/39Ar dates of individual hornblende grains from 20 samples taken at 600 to 700 yr spacing between 10,500 and 22,000 yr B.P., from Orphan Knoll core EW9303-GGC31. Heinrich layers are characterized by a dominant Paleoproterozoic hornblende provenance consistent with published studies. A change in provenance between Heinrich events H2 and H1 indicates contributions of iceberg calving from the Newfoundland and southern Labrador margins. Between H1 and the Younger Dryas interval, Paleoproterozoic ice rafted grains remained dominant. The dominance of Baffin Island (or Greenland?) sources to the ice rafted detritus is ascribed to the retreat of the southern Laurentide ice sheet at about the time of H1—a retreat that isolated Newfoundland and southern Labrador ice from the shelf-slope boundary.

Keywords

ice rafted detritusLaurentide ice sheetHeinrich layersprovenance40Ar/39Ar
Type
Research Article
Information
Quaternary Research , Volume 54 , Issue 3 , November 2000 , pp. 372 - 383
Copyright
University of Washington

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