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- Title
A stage 7 marine interglacial record (the Grødeland Interglacial) on Jæren, southwestern Norway; foraminiferal, stable isotopes and amino acid evidence.
- Authors
Sejrup, Hans Petter; Iversen, Marianne; Larsen, Eiliv; Landvik, Jon Y.; Janocko, Juraj
- Abstract
Foraminiferal biostratigraphy, stable isotopes and amino-acid diagenesis have been investigated in a 125 m (+1 to -124 m a.s.l.) long core from Jæren, southwestern Norway. Two marine units, the 42m thick Grødeland Sand and the 8 m thick Sunde Sand, were found between till beds. Based on the biostratigraphic data, nine foraminiferal assemblage zones are defined. The Grødeland Sand showsa development from an ice-proximal glacial environment in the lower part, through an arctic, possibly shallow-water, environment, into a full interglacial open-shelf regime (the Grødeland Interglacial).The Grødeland Interglacial sediments (zone 6 Cassidulina laevigata-Cibicides zone) were deposited at a water depth of 20 m, in an open, high-energy shelf environment with temperature conditions similarto those prevailing in the northern North Sea today. The interglacial sediments are followed by deposits characteristic of an arctic environment which become more ice proximal upwards. Superimposed on theGrødeland Sand is a diamicton interpreted as till. Above the till is the upper marine unit (the Sunde Sand), which in the lower part yielded a shallow-water arctic fauna replaced upwards by an ice-proximalfacies. The upper part of the Sunde Sand is barren of foraminifera and is superimposed by an upper till. The Sunde Interstadial is defined as a climatostratigraphic event resulting in deglaciation of westernNorway and deposition of the Sunde Sand. Based on amino acid geochronology and inferences from the biostratigraphy, the Grødeland Interglacial is assigned to oxygen-isotope stage 7, whereas the SundeInterstadial is assigned to the Early Weichselian. Combined with existing data from the North Sea region and the Norwegian Sea, it is concluded that for stage 7, in addition to stages 1 and 5e, there musthave been a strong influx of Atlantic water into the Norwegian Sea north of the British Isles. This circulation created a similar north-...
- Subjects
NORWAY; JAEREN (Norway); FORAMINIFERA; DIAGENESIS
- Publication
Boreas, 1999, Vol 28, Issue 2, p326
- ISSN
0300-9483
- Publication type
Article
- DOI
10.1080/030094899750044396