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Timing and character of the last interglacial-glacial transition in the eastern Canadian Arctic and Northwest Greenland

Gifford H. Miller, Svend Funder, Anne de Vernal and John T. Andrews
Timing and character of the last interglacial-glacial transition in the eastern Canadian Arctic and Northwest Greenland (in The last interglacial-glacial transition in North America, Peter U. Clark (editor) and Peter D. Lea (editor))
Special Paper - Geological Society of America (1992) 270: 223-231

Abstract

The records of glaciation and climate change preserved in sediments on the Canadian and northwest Greenland margins of Baffin Bay pertaining to the last interglacial-glacial transition are remarkably similar. In both regions, warmer than present terrestrial and nearshore marine facies of the last interglacial sensu stricto (s.s.) are overlain by glacial sediments that represent the most extensive advance of continental ice during the last glaciation. Chronometric controls ( (super 14) C, thermoluminescence, amino acids) indicate an isotope stage 5 age for this advance. Evidence for extensive high-latitude glacial erosion during stage 5 is recorded by abundant pre-Quaternary palynomorphs in Baffin Bay sediment cores, in contrast to a much reduced flux during the remainder of the last glaciation. Warm nearshore marine conditions (seasonally ice free) also occurred near the end of stage 5 along both the eastern Baffin Island and northwest Greenland coasts after the maximum glacial advance; surface water in central Baffin Bay apparently was dominated by meltwater at this time. Subsequently (isotope stages 4, 3, and 2), terrestrial conditions were colder and drier, sea-surface temperatures were lower, and ice margins were retracted. Minimum summer insolation at high latitudes, coupled with mild winters and vigorous meridional oceanic (and presumably atmospheric) circulation characterized the inception phase of the last glaciation during isotope stage 5. In contrast, the 20 ka B.P. (isotope stage 2) "last glacial maximum" was characterized by a zonal circulation regime that resulted in cold and dry conditions over Baffin Bay; the margins of the northwest Greenland and northeast Laurentide ice sheets did not extend beyond the fiords at this time.


ISSN: 0072-1077
EISSN: 2331-219X
Coden: GSAPAZ
Serial Title: Special Paper - Geological Society of America
Serial Volume: 270
Title: Timing and character of the last interglacial-glacial transition in the eastern Canadian Arctic and Northwest Greenland
Title: The last interglacial-glacial transition in North America
Author(s): Miller, Gifford H.Funder, Svendde Vernal, AnneAndrews, John T.
Author(s): Clark, Peter U.editor
Author(s): Lea, Peter D.editor
Affiliation: University of Colorado, Institute of Arctic and Alpine Research, Boulder, CO, United States
Affiliation: Oregon State University, Department of Geosciences, Corvallis, OR, United States
Pages: 223-231
Published: 1992
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
ISBN: 0813722705
References: 49
Accession Number: 1993-006651
Categories: Quaternary geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sect., sketch maps
N53°19'54" - N53°19'54", W45°15'42" - W45°15'42"
N70°27'30" - N70°27'30", W64°39'24" - W64°39'24"
N58°12'36" - N58°12'36", W48°22'06" - W48°22'06"
Secondary Affiliation: Bowdoin College, USA, United StatesGeological Museum, DNK, DenmarkUniversite du Quebec a Montreal, CAN, Canada
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 1993
Program Name: ODPOcean Drilling Program
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