DOI: 10.1016/j.quascirev.2013.12.011
Scopus记录号: 2-s2.0-84900449868
论文题名: Late Quaternary evolution of sediment provenances in the Central Arctic Ocean: Mineral assemblage, trace element composition and Nd and Pb isotope fingerprints of detrital fraction from the Northern Mendeleev Ridge
作者: Fagel N. ; Not C. ; Gueibe J. ; Mattielli N. ; Bazhenova E.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2014
卷: 92 起始页码: 140
结束页码: 154
语种: 英语
英文关键词: Arctic Ocean
; Late Quaternary
; Mineral assemblage
; Paleoceanography
; Radiogenic isotope
; Sediment
; Trace element composition
Scopus关键词: Glacial geology
; Isotopes
; Kaolinite
; Lead
; Minerals
; Sea level
; Sedimentology
; Sediments
; Silicates
; Underwater mineralogy
; Volcanoes
; Arctic ocean
; Late quaternary
; Mineral assemblage
; Paleoceanography
; Radiogenic isotopes
; Trace element composition
; Neodymium
; clay mineral
; kaolinite
; lead isotope
; mineralogy
; neodymium isotope
; provenance
; Quaternary
; sediment
; suspended particulate matter
; trace element
; Arctic Ocean
; Atlantic Ocean
; Canada
; Canadian Margin
; Mackenzie River [Northwest Territories]
; Mendeleyev Ridge
; North America
; Northwest Territories
; Russian Federation
; Siberian Platform
英文摘要: Mineral assemblage, trace element content and Nd and Pb isotope signatures were analysed on the fine fraction (<20μm) of sedimentary records from the Northern Mendeleev Ridge in the Central Arctic Ocean. Our aim was to identify the detrital particle provenance and to interpret the changes over the past ~250ka in the relative contribution of the different source-areas in relation to paleoenvironmental conditions. The clay mineral assemblage and the Nd and Pb isotope signatures depict systematic changes over the Late Quaternary. The bulk mineralogy exhibits increases in the relative contribution of carbonate minerals vs. silicates in interglacial/deglacial intervals. In glacial intervals, the mineral assemblage of the <20μm fraction is characterised by an enrichment in kaolinite, counterbalanced by a decrease in illite. The Nd and Pb isotope signatures of <20μm fraction are interpreted using a three end-member mixing model, involving crustal supplies from North America and Canada, from the Siberian margin and some from volcanic material. A compilation of geochemical signatures of geological terraines surrounding the Arctic Ocean allowed each end-member to be assigned a representative signature, averaging the signal of the eroded terraines. The Suspended Particulate Matter (SPM) of the MacKenzie River represents an average signature of the sedimentary supplies delivered from the North American platform and Canadian margin. The SPM of the Lena River reflects the mean sedimentary signature of the Siberian platform. The Okhotsh-Chukotka province from the Eastern border of Siberia is identified as the most probable volcanic source. Late Quaternary evolution of the estimated relative contribution of the three end-members confirms that the sediment provenances in the Central Arctic Ocean remain close to the current conditions during past interglacials/deglacials MIS1-3, MIS5/TII and MIS7/TIII. In contrast, glacial conditions (MIS4 and MIS6) record minimum supplies from the American margin, associated with increased volcanic contribution, to the Mendeleev Ridge core location suggesting a different sea-ice circulation associated with a low sea-level and reduced shelf area. © 2014 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60282
Appears in Collections: 过去全球变化的重建
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作者单位: UR. AGEs - Argiles, Géochimie et Environnement sédimentaires, Université de Liège, B-4000 Liège, Belgium; GEOTOP, UQAM, Montréal, Canada; Atmosphere and Ocean Research Institute, University of Tokyo, Kashiwanoha, Japan; G-Time, Université Libre de Bruxelles, Belgium; Alfred Wegener Institute for Polar and Marine Research, Bremerhaven, Germany
Recommended Citation:
Fagel N.,Not C.,Gueibe J.,et al. Late Quaternary evolution of sediment provenances in the Central Arctic Ocean: Mineral assemblage, trace element composition and Nd and Pb isotope fingerprints of detrital fraction from the Northern Mendeleev Ridge[J]. Quaternary Science Reviews,2014-01-01,92