Article (Scientific journals)
North American origin of “pink–white” layers at the Mendeleev Ridge (Arctic Ocean): New insights from lead and neodymium isotope composition of detrital sediment component
Bazhenova, E.; Fagel, Nathalie; Stein, R.
2017In Marine Geology, 386, p. 44-55
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Keywords :
Arctic Ocean; Detrital fraction; Late Quaternary; Pd and Nd isotopes; Pink–white layers; Sediment provenance; Analytical geochemistry; Isotopes; Lead; Mixing; Neodymium; Sea ice; Detrital fractions; Nd isotopes; White layer; Sediments; Quaternary; Amerasian Basin; Chukchi Sea; East Siberian Sea; Laptev Sea; Mendeleyev Ridge; North America
Abstract :
[en] Dolomite–rich layers of distinct pinkish colour are used as lithostratigraphic markers in the Amerasian Basin of the Arctic Ocean. However, origin of dolomite in these sediment units has not been studied in detail. In this study, lead (Pb) and neodymium (Nd) isotope composition of detrital clay–size fraction from different lithofacies were investigated in core PS72/340-5 recovered at the eastern flank of the Mendeleev Ridge. Prior to the geochemical analyses, grain–size distribution was analyzed in order to minimize the grain–size effect on the provenance signature. For provenance discrimination, results of isotope measurements were compared with marine surface sediment data and values for the circum–Arctic subaerial provinces. Late Quaternary sediment supply variability was analyzed using the mixing model constrained by two tracers: 207Pb/206Pb and εNd. Variations of sediment isotopic composition are inferred to result from mixing of volcanic and plutonic components. Usage of Pb isotopic ratios alone does not allow distinction between these two types of sources. Results confirm that over the last estimated ca. 200 ka dolomite–rich pink layers at the Mendeleev Ridge were deposited during events probably associated with intensified iceberg transport from North America. In general, however, sedimentation was mostly controlled by terrigenous input from the Chukchi and East Siberian Seas, whereas sediment supply from the Laptev Sea area remained less important and relatively constant at the studied location. © 2017 Elsevier B.V.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Bazhenova, E.;  Department of Marine Geology and Paleontology, Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Am Alten Hafen 26, Bremerhaven, Germany, Institute of Earth Sciences, St. Petersburg State University, Universitetskaya nab. 7–9, St. Petersburg, Russian Federation
Fagel, Nathalie  ;  Université de Liège - ULiège > Département de géologie > Argiles, géochimie et environnements sédimentaires
Stein, R.;  Department of Marine Geology and Paleontology, Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Am Alten Hafen 26, Bremerhaven, Germany, Department of Geosciences (FB5), University of Bremen, Klagenfurter Str. 4, Bremen, Germany
Language :
English
Title :
North American origin of “pink–white” layers at the Mendeleev Ridge (Arctic Ocean): New insights from lead and neodymium isotope composition of detrital sediment component
Publication date :
2017
Journal title :
Marine Geology
ISSN :
0025-3227
eISSN :
1872-6151
Publisher :
Elsevier B.V.
Volume :
386
Pages :
44-55
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
Helmholtz Graduate School for Polar and Marine Research
ULiège - Université de Liège [BE]
St Petersburg University [RU]
RFBR - Russian Foundation for Basic Research [RU]
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