Late Paleogene Diatom Biostratigraphy and Paleoenvironments of the Northern Norwegian-Greenland Sea

Scherer, Reed P.; Koç, N.

doi:10.2973/odp.proc.sr.151.155.1996

Cited by 26 publications

(27 citation statements)

References 17 publications

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“…It is likely that these species migrated into the Norwegian Basin with the incoming surface-water masses. Latest Eocene to Oligocene diatom assemblages from Holes 908 and 913 in the northern Norwegian Sea contain many low-latitude species, suggesting that warm waters were present (Scherer and Koç, 1996). This supports the premise that surface waters entered the Norwegian Sea from the Atlantic (or also via the North Sea), bringing temperate flo- ras and faunas as well as neritic benthic foraminifers (see also discussion by Thiede and Myhre, 1996).…”

Section: Faunal Connections To the Atlanticsupporting

confidence: 68%

Oligocene deep-water agglutinated foraminifers at Site 985, Norwegian Basin, southern Norwegian Sea

Kaminski¹,

Austin²

1999

Proceedings of the Ocean Drilling Program, 162 Scientific Results

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The stratigraphic distribution of deep-water agglutinated foraminifers was examined using 50 samples from Ocean Drilling Program (ODP) Hole 985A, drilled on the gentle slope of the Iceland Plateau in the Norwegian Basin. A total of 40 species and generic groupings was determined in this study. Three stratigraphically meaningful assemblages are recognized in Hole 985A: a basal assemblage with coarsely agglutinated forms (Cores 162-985A-62X through 50X), a Spirosigmoilinella compressa assemblage (Cores 162-985A-49X through 40X), and a sparse assemblage with pyritized radiolarians in the uppermost part of the studied interval (Cores 162-985A-39X through 32X). The whole succession from the base of Hole 985A to Core 162-985A-32X is here assigned to the Dorothia siegliei-Rotaliatina bulimoides Zone of Oligocene age. The stratigraphic ranges of several species extended into younger strata compared with biostratigraphic records from the Vøring Slope (ODP Hole 643A) and from an exploration well on the Vøring Plateau.Taxonomic differences between the foraminiferal records of the Norwegian Sea and the deep Labrador Sea provide evidence for faunal isolation of the deep Norwegian basin during the Oligocene. This isolation is attributed to limited marine connections across the Greenland-Scotland Ridge, resulting in Norwegian Sea deep water that was corrosive and poorly ventilated. Foraminiferal evidence suggests that Norwegian Sea deep water was poorly oxygenated during the Oligocene.

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Section: Faunal Connections To the Atlanticsupporting

confidence: 68%

Oligocene deep-water agglutinated foraminifers at Site 985, Norwegian Basin, southern Norwegian Sea

Kaminski¹,

Austin²

1999

Proceedings of the Ocean Drilling Program, 162 Scientific Results

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“…Sediments recovered during Ocean Drilling Program (ODP) Legs 151 and 152 to the high-latitude North Atlantic have provided us with more information on the temporal and spatial distribution of diatomrich sediments Koç and Flower, 1998;Scherer and Koç, 1996;Stabell and Koç, 1996). High-resolution diatom biostratigraphy and abundance investigations of Site 919 confirmed the influence of Pleistocene glacial-interglacial climatic fluctuations on the diatom abundance of high-latitude North Atlantic sediments for the last 1 Ma (Koç and Flower, 1998).…”

Section: Introductionmentioning

confidence: 95%

High-resolution Pleistocene diatom biostratigraphy of Site 983 and correlations with isotope stratigraphy

Koç¹,

Hodell²,

Kleiven³

et al. 1999

Proceedings of the Ocean Drilling Program, 162 Scientific Results

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High accumulation rates and the presence of well-preserved, abundant diatoms in Site 983 sediments from the Gardar Drift gave us the opportunity to refine the Pleistocene diatom biostratigraphic resolution of the high-latitude North Atlantic. Eight Pleistocene diatom datum events are identified and, for the first time, tied directly to the oxygen isotope record and paleomagnetic stratigraphy of Site 983. These datum events are (1) the last occurrence (LO) of Proboscia curvirostris at 0.3 Ma, (2) the LO of Thalassiosira jouseae at 0.3 Ma, (3) the LO of Nitzschia reinholdii at 0.6 Ma, (4) the LO of Nitzschia fossilis at 0.68 Ma, (5) the LO of Nitzschia seminae at 0.84 Ma, (6) the first occurrence (FO) of N. seminae at 1.25 Ma, (7) the FO of Proboscia curvirostris at 1.53 Ma, and (8) the FO of Pseudoeunotia doliolus at 1.89 Ma. Most of these datums are found to be synchronous between the middle and high latitudes of the North Atlantic and the North Pacific. On the basis of these datums, four highlatitude North Atlantic diatom zones are proposed for the Pleistocene. The record of diatom abundance and preservation at Site 983 gives evidence for the influence of fluctuating Pleistocene climatic conditions on diatom productivity in the high-latitude North Atlantic.

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“…The Oligocene and Eocene zonation is modified from the Norwegian Sea diatom zonation of Schrader and Fenner (1976), Dzinoridze et al (1978), Fenner (1985, and Scherer and Koç (1996). Absolute ages for diatom biostratigraphic horizons were updated from the Cande and Kent (1995) geomagnetic polarity timescale (GPTS).…”

Section: Diatomsmentioning

confidence: 99%

Methods

2006

Proceedings of the IODP 302

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Late Paleogene Diatom Biostratigraphy and Paleoenvironments of the Northern Norwegian-Greenland Sea

Cited by 26 publications

References 17 publications

Oligocene deep-water agglutinated foraminifers at Site 985, Norwegian Basin, southern Norwegian Sea

Oligocene deep-water agglutinated foraminifers at Site 985, Norwegian Basin, southern Norwegian Sea

High-resolution Pleistocene diatom biostratigraphy of Site 983 and correlations with isotope stratigraphy

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