DOI: 10.1016/j.quascirev.2013.12.027
Scopus记录号: 2-s2.0-84893145474
论文题名: Neodymium associated with foraminiferal carbonate as a recorder of seawater isotopic signatures
作者: Tachikawa K. ; Piotrowski A.M. ; Bayon G.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2014
卷: 88 起始页码: 1
结束页码: 13
语种: 英语
英文关键词: Cleaning procedure
; Foraminiferal tests
; Microanalysis
; Neodymium isotopes
; Oceanic circulation
Scopus关键词: Bottom-water circulation
; Cleaning procedures
; Isotopic composition
; Nd isotopic compositions
; Neodymium isotopes
; Oceanic circulations
; Oceanographic conditions
; Planktonic foraminifera
; Isotopes
; Manganese
; Microanalysis
; Seawater
; Sedimentology
; Sediments
; Neodymium
; carbonate
; foraminifera
; isotopic ratio
; marine environment
; neodymium isotope
; oceanic circulation
; seawater
; tracer
英文摘要: Neodymium isotopic ratios in marine environments have been used as a tracer of water masses and exchange processes between dissolved and particulate phases. The interest in this tracer has been growing with improvement of our knowledge on its chemical behaviour in the modern ocean and the identification of sedimentary phases that preserve past seawater e{open}Nd values. In the last few decades the Nd isotopic composition measured on Fe-Mn crusts, sediment leachates, bulk carbonate fraction, corals and fish teeth have been increasingly interpreted in the context of understanding the role of the ocean in paleoclimate changes. In particular, calcareous foraminiferal tests (shells) have acquired increasing attention as an archive of seawater Nd isotopic signatures, because it allows continuous high-resolution records to be measured and directly compared to other proxies including stable isotopes and trace metals. The main challenge of interpreting the Nd isotopic composition of foraminifera is determining the origin of the Nd preserved within them. In this review, we present an overview of methodological progress including that of bulk foraminifera and microanalyses within foraminiferal tests, as well as geochemical meaning of extracted Nd concentrations and isotopic compositions. The growing body of evidence suggests that Nd isotopic signatures of sedimentary planktonic foraminifera correspond to bottom water values rather than surface water ones. The Nd-rich phases associated with sedimentary foraminifera are adhesive nano-scale particles of Mn and Fe oxides and hydroxides, and Mn-rich carbonates formed within layers of foraminiferal calcite. Mechanical cleaning to remove clay minerals is likely to be sufficient in most cases to reconstruct past bottom water circulations. Unresolved issues include the potential influence of pore water Nd on e{open}Nd values extracted from sedimentary foraminiferal tests under different sedimentalogical and oceanographic conditions. © 2013 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60358
Appears in Collections: 过去全球变化的重建
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作者单位: Aix-Marseille Université, CNRS, IRD, CEREGE UM34, 13545 Aix en Provence, France; Godwin Laboratory for Palaeoclimate Research, Department of Earth Sciences, University of Cambridge, Cambridge CB2 3EQ, United Kingdom; IFREMER, Unité de Recherche Géosciences Marines, F-29280 Plouzané, France
Recommended Citation:
Tachikawa K.,Piotrowski A.M.,Bayon G.. Neodymium associated with foraminiferal carbonate as a recorder of seawater isotopic signatures[J]. Quaternary Science Reviews,2014-01-01,88