Late Quaternary dinoflagellate cyst stratigraphy at the Eurasian continental margin, Arctic Ocean; indications for Atlantic water inflow in the past 150,000 years

Author(s): Matthiessen, Jens; Knies, Jochen; Nowaczyk, Norbert R.; Stein, Ruediger
Author Affiliation(s): Primary:
Alfred Wegener Institute for Polar and Marine Research, Bremerhaven, Federal Republic of Germany
Other:
Lund University, Sweden
University of Bergen, Norway
GeoForschungsZentrum Potsdam, Potsdam, Federal Republic of Germany
Volume Title: Late Quaternary stratigraphy and environments of northern Eurasia and the adjacent Arctic seas; new contributions from QUEEN
Volume Author(s): Thiede, Jörn, editor; Bauch, Henning A.; Hjort, Christian; Mangerud, Jan
Source: Global and Planetary Change, 31(1-4), p.65-86; Annual QUEEN workshop on the Late Quaternary stratigraphy and environments of northern Eurasia and the adjacent Arctic seas, Oystese, Norway, April 1999, edited by Jörn Thiede, Henning A. Bauch, Christian Hjort and Jan Mangerud. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0921-8181
Note: In English. 91 refs.; illus., incl. sects., 4 tables, sketch map
Summary: Four sediment cores located at the Eurasian continental margin underlying the Atlantic layer have been studied for their dinoflagellate cyst content. Concentrations of distinct dinoflagellate cyst taxa display fluctuations in the late Quaternary, which are linked to changes in the inflow of relatively warm Atlantic surface and near-surface waters, resulting in increased local production of cysts in certain time intervals. Based on the assumption that marked changes in strength of inflow occurred synchronously at the Eurasian continental margin, concentration maxima can be used to correlate sediment cores. A dinoflagellate cyst record from the northern Barents Sea continental margin has been related to the stable oxygen isotope and paleomagnetic records to provide direct chronological information. The combination of these methods permits definition of stratigraphic sections equivalent to oxygen isotope stages in carbonate-poor sequences from the Eurasian continental margin. Previous age models of sediment cores are revised, based on dinoflagellate cyst abundance peaks and species distribution, but a firm chronostratigraphy of sedimentary sequences at the eastern Laptev Sea continental margin cannot be established because of the weak signal at the sites furthest from Fram Strait. In the past 150,000 years, the influence of Atlantic (sub-) surface waters generally decreased from west to east along the Eurasian continental margin, in particular during the glacials. Pronounced concentration maxima of cosmopolitan and temperate-subpolar dinoflagellate cysts indicate the inflow of Atlantic waters and seasonally increased production of cysts in the Holocene and Eemian. The Holocene is well-marked at the entire Eurasian continental margin but it is more difficult to assess the extent of (sub-) surface water inflow during the Eemian, which may have only reached the western Laptev Sea continental margin. Abstract Copyright (2001) Elsevier, B.V.
Year of Publication: 2001
Research Program: ODP Ocean Drilling Program
Key Words: 24 Surficial Geology, Quaternary Geology; Algae; Arctic Ocean; Atlantic Ocean; Barents Sea; Biostratigraphy; Cenozoic; Coccolithophoraceae; Continental margin sedimentation; Cores; Dinoflagellata; Eurasia; Floral list; Foraminifera; Glacial environment; Glaciomarine environment; Globigerinacea; Invertebrata; Leg 151; Magnetostratigraphy; Marine environment; Marine sediments; Microfossils; Neogloboquadrina; Neogloboquadrina pachyderma; North Atlantic; Ocean Drilling Program; Ocean circulation; Paleo-oceanography; Paleocirculation; Paleoecology; Paleomagnetism; Palynomorphs; Plantae; Protista; Quaternary; Rotaliina; Sedimentation; Sediments; Upper Quaternary
Coordinates: N691455 N802830 E0081340 W0124155
Record ID: 2002014572
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands