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(super 40) Ar/ (super 39) Ar hornblende provenance clues about Heinrich event 3 (H3)

Greg E. Downing, Sidney R. Hemming, Anne Jost and Martin Roy
(super 40) Ar/ (super 39) Ar hornblende provenance clues about Heinrich event 3 (H3) (in Advances in (super 40) Ar/ (super 39) Ar dating; from archaeology to planetary sciences, F. Jourdan (editor), D. F. Mark (editor) and C. Verati (editor))
Special Publication - Geological Society of London (September 2013) 378 (1): 245-263

Abstract

Iceberg discharges into the North Atlantic are important sources of fresh water, and the sediments they deposit can provide constraints on which sectors of different ice sheets were contributing icebergs. (super 40) Ar/ (super 39) Ar ages of sand-sized hornblende grains provide useful constraints on IRD (ice-rafted detritus) source areas. Heinrich events are intervals of anomalously high percentages of IRD in marine sediment cores of the North Atlantic IRD belt. In contrast to the others, Heinrich event 3 (H3) records a significantly lower flux of IRD. This study compares (super 40) Ar/ (super 39) Ar hornblende age distributions from the interval around and including H3 in giant gravity core EW9303-GGC31 from Orphan Knoll, in the southern part of the Labrador Sea, with piston core V28-82 in the eastern part of the North Atlantic IRD belt. Collectively, these results confirm that H3 represents a Hudson Strait IRD event, but that it was smaller than during H1, H2, H4 and H5, and therefore comprises only a small fraction of the detritus at the eastern North Atlantic location of V28-82. These results support a previously published interpretation of across-strait ice flow during H3 at Hudson Strait.


ISSN: 0305-8719
EISSN: 2041-4927
Coden: GSLSBW
Serial Title: Special Publication - Geological Society of London
Serial Volume: 378
Serial Issue: 1
Title: (super 40) Ar/ (super 39) Ar hornblende provenance clues about Heinrich event 3 (H3)
Title: Advances in (super 40) Ar/ (super 39) Ar dating; from archaeology to planetary sciences
Author(s): Downing, Greg E.Hemming, Sidney R.Jost, AnneRoy, Martin
Author(s): Jourdan, F.editor
Author(s): Mark, D. F.editor
Author(s): Verati, C.editor
Affiliation: Columbia University, Department of Earth and Environmental Sciences, Palisades, NY, United States
Pages: 245-263
Published: 20130930
Text Language: English
Publisher: Geological Society of London, London, United Kingdom
Number of pages: 19
References: 82
Accession Number: 2013-086786
Categories: Quaternary geologyGeochronology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, sketch map
N58°00'00" - N64°00'00", W70°00'00" - W62°00'00"
N48°00'00" - N60°00'00", W64°00'00" - W44°00'00"
Secondary Affiliation: Universite du Quebec a Montreal, CAN, Canada
Source Note: Online First
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 201351
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