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Late glacial and deglacial history of ice rafting in the Labrador Sea: A perspective from radiogenic isotopes in marine sediments

By
Greg E. Downing
Greg E. Downing
Department of Earth and Environmental Sciences and Lamont-Doherty Earth Observatory, Columbia University, Route 9W, Palisades, New York 10964, USA
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Sidney R. Hemming
Sidney R. Hemming
Department of Earth and Environmental Sciences and Lamont-Doherty Earth Observatory, Columbia University, Route 9W, Palisades, New York 10964, USA
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Published:
May 01, 2012

The late glacial and deglacial history of the Southeastern Laurentide Ice Sheet involves the southward advance and subsequent northward retreat from southeastern Canada and the northeastern United States. Superposed on this advance and retreat are three major ice-rafting events associated with Heinrich events 2 and 1 (H2 and H1) and the Younger Dryas. Nd, Sr, and Pb isotopes were measured on the 63–150 μm, de-carbonated marine sediment for the period 24–10.5 14C ka, from marine sediment core EW9303-GGC31, collected from the top of Orphan Knoll, a topographic high 550 km northeast of Newfoundland, Canada. In general, one of the problems with understanding ice-rafting records is the disparate provenance strategies that have been used in different studies. Nd and Sr isotopes have been widely used in the study of North Atlantic sediment provenance, and Pb isotopes and 40Ar/39Ar hornblende ages have also been used for provenance assessment in a number of studies. The new Nd, Sr, and Pb isotope data presented here are complementary to the published hornblende data from the same samples, and provide a data set that allows more confident comparison of this record with other published provenance studies. The results are consistent with reconstructions based on a combination of marine and land-based geomorphic observations.

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GSA Special Papers

Mineralogical and Geochemical Approaches to Provenance

E. Troy Rasbury
E. Troy Rasbury
Department of Geosciences, Stony Brook University, Stony Brook, New York 11794-2100, USA
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Sidney R. Hemming
Sidney R. Hemming
Department of Earth and Environmental Sciences and Lamont-Doherty Earth Observatory, Columbia University, Palisades, New York 10964, USA
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Nancy R. Riggs
Nancy R. Riggs
Geology Program, School of Earth Sciences and Environmental Sustainability, Northern Arizona University, Flagstaff, Arizona 86011, USA
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Geological Society of America
Volume
487
ISBN print:
9780813724874
Publication date:
May 01, 2012

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