Paleoenvironmental changes in the Norwegian Sea and the Northeast Atlantic during the last 2.8 m.y.; Deep Sea Drilling Project/Ocean Drilling Program sites 610, 642, 643 and 644

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doi: 10.1029/PA003i005p00563
Author(s): Jansen, E.; Bleil, U.; Henrich, R.; Kringstad, L.; Slettemark, B.
Author Affiliation(s): Primary:
Univ. Bergen, Dep. Geol., Bergen, Norway
Other:
Univ. Tromso, Norway
Univ. Bremen, Federal Republic of Germany
Univ. Kiel, Federal Republic of Germany
Volume Title: Special section on Polar seas geological record
Volume Author(s): Thiede, Jörn, prefacer; Vorren, Tore O.
Source: Paleoceanography, 3(5), p.563-581; Second international congress on paleoceanography , session on the Polar seas geological record, Woods Hole, MA, Sept. 1986, prefaced by Jörn Thiede and Tore O. Vorren. Publisher: American Geophysical Union, Washington, DC, United States. ISSN: 0883-8305 CODEN: POCGEP
Note: In English. 44 refs.; illus. incl. 1 table, charts, sketch map
Summary: Sedimentological, isotopic and magnetostratigraphic investigations of Ocean Drilling Program and Deep Sea Drilling Project sites 642, 643, 644 and 610 document the oceanographic and climatic evolution of the Norwegian Sea and the northeastern Atlantic over the last 2.8 m.y.. The results show that a major expansion of the Scandinavian Ice Sheet to the coastal areas took place at about 2.56 Ma. Relatively severe glacials appeared until about 2 Ma. The period 2.6 - 1.2 Ma experienced in general cold surface water conditions with only a weak influx of temperate Atlantic water as compared with late Quaternary interglacials. The Norwegian Sea was a sink of deep water through this period but deepwater ventilation was reduced and calcite dissolution was high compared with the Holocene. Deep water formed by other mechanisms than it does today. Between 2 and 1.2 Ma the glaciations in Scandinavia were small. A transition toward larger glacials took place during the period 1.2 to 0.6 Ma, corresponding to warmer interglacials and reduced calcite dissolution. Only during the last 0.6 m.y. has the oceanographic and climatic system of the Norwegian Sea varied in the manner described in previous studies of the late Quaternary. A strong thermal gradient was present between the Norwegian Sea and the northeastern Atlantic during the Matuyama (2.5-0.7 Ma). This is interpreted as a sign of a more zonal and less meridional climatic system over the region compared with the present situation.
Year of Publication: 1988
Research Program: DSDP Deep Sea Drilling Project
IPOD International Phase of Ocean Drilling
ODP Ocean Drilling Program
Key Words: 07 Marine Geology and Oceanography; 24 Surficial Geology, Quaternary Geology; Arctic Ocean; Atlantic Ocean; Biochemistry; C-13/C-12; Carbon; Cenozoic; DSDP Site 610; Deep Sea Drilling Project; Environment; European Atlantic; Foraminifera; Glacial environment; Glaciomarine environment; IPOD; Interglacial environment; Invertebrata; Isotopes; Leg 104; Leg 94; Marine environment; Marine sediments; Microfossils; Neogene; North Atlantic; Northeast Atlantic; Norwegian Sea; O-18/O-16; ODP Site 642; ODP Site 643; ODP Site 644; Ocean Drilling Program; Oxygen; Paleo-oceanography; Paleoclimatology; Paleoecology; Paleoenvironment; Paleomagnetism; Planktonic taxa; Pliocene; Protista; Quaternary; Sedimentation; Sediments; Stable isotopes; Stratigraphy; Tertiary
Coordinates: N531318 N531329 W0185312 W0185342
N671312 N671330 E0025548 E0025542
N674254 N674254 E0010200 E0010200
N664042 N664042 E0043436 E0043436
Record ID: 1990009177
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