Sedimentology and stable carbon and oxygen isotope record of the Central Arctic
Cobertura |
MEDIAN LATITUDE: 86.801240 * MEDIAN LONGITUDE: 66.877060 * SOUTH-BOUND LATITUDE: 85.327700 * WEST-BOUND LONGITUDE: -14.022000 * NORTH-BOUND LATITUDE: 88.036000 * EAST-BOUND LONGITUDE: 144.166200 * DATE/TIME START: 1991-08-15T00:00:00 * DATE/TIME END: 1991-09-16T00:00:00 |
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Data(s) |
09/02/1998
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Resumo |
Stable oxygen and carbon isotope and sedimentological-paleontological investigations supported by accelerator mass spectrometry 14C datings were carried out on cores from north of 85°N in the eastern central Arctic Ocean. Significant changes in accumulation rates, provenance of ice-rafted debris (IRD), and planktic productivity over the past 80,000 years are documented. During peak glacials, i.e., oxygen isotope stages 4 and 2, the Arctic Ocean was covered by sea ice with decreased seasonal variation, limiting planktic productivity and bulk sedimentation rates. In early stage 3 and during Termination I, major deglaciations of the circum-Arctic regions caused lowered salinities and poor oxygenation of central Arctic surface waters. A meltwater spike and an associated IRD peak dated to ~14-12 14C ka can be traced over the southern Eurasian Basin of the Arctic Ocean. This event was associated with the early and rapid deglaciation of the marine-based Barents Sea Ice Sheet. A separate Termination Ib meltwater event is most conspicuous in the central Arctic and is associated with characteristic dolomitic carbonate IRD. This lithology suggests an origin of glacial ice from northern Canada and northern Greenland where lower Paleozoic platform carbonates crop extensively out. |
Formato |
application/zip, 20 datasets |
Identificador |
https://doi.pangaea.de/10.1594/PANGAEA.733504 doi:10.1594/PANGAEA.733504 |
Idioma(s) |
en |
Publicador |
PANGAEA |
Direitos |
CC-BY: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted |
Fonte |
Supplement to: Nørgaard-Pedersen, Niels; Spielhagen, Robert F; Thiede, Jörn; Kassens, Heidemarie (1998): Central Arctic surface ocean environment during the past 80,000 years. Paleoceanography, 13(2), 193-204, doi:10.1029/97PA03409 |
Palavras-Chave | #>500 µm; Acc rate IRD; Accumulation rate, ice rafted debris by number; Accumulation rate, sediment, mean; Age; AGE; Age, 14C AMS; Age, calculated calendar years; Age, dated; Age, dated standard deviation; Age, reservoir corrected (Bard, 1988); Age dated; Age model; Age model, composite; Age std dev; Amundsen Basin; ARK-VIII/3; CaCO3; Calcium carbonate; Calculated; Carb detr; Carbonate, detritic/terrigenic; Counting; Depth; DEPTH, sediment/rock; detrital carbonate (500-1000 µm); Element analyser CHN, LECO; fix points from AMS 14C and stable isotope stratigraphy; Foraminifera, planktic flux; Foraminifera, planktic indeterminata; Foram plankt flux; Foram plankt indet; Gakkel Ridge, Arctic Ocean; GEOMAR; Giant box corer; GKG; grains/g dry sediment; Grain size, sieving; Helmholtz Centre for Ocean Research Kiel; Ice rafted debris, general; IRD; Label; Lomonosov Ridge, Arctic Ocean; MAR; Mass spectrometer Finnigan MAT 251; Morris Jesup Rise; N. pachyderma s d13C; N. pachyderma s d18O; Neogloboquadrina pachyderma sinistral, d13C; Neogloboquadrina pachyderma sinistral, d18O; Polarstern; PS19/160; PS19/175; PS19/186; PS19/206; PS19/218; PS19 ARCTIC91; PS2166-2; PS2177-1; PS2185-3; PS2195-4; PS2200-2; Quaternary Environment of the Eurasian North; QUEEN; Sample code/label; Sand; Size fraction > 0.500 mm, gravel; total IRD (500-1000 µm) |
Tipo |
Dataset |