期刊
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
卷 12, 期 -, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2011GC003741
关键词
neodymium; paleoceanography; water mass tracer
资金
- Rutgers University Graduate School, NSF [OCE-0095219]
- UK NERC [NE/D002206/1, RG43765 LBZG/021, NE/F006047/1, RG50124 LBZG/036]
- NERC [NE/F006047/1, NE/D002206/1] Funding Source: UKRI
- Natural Environment Research Council [NE/D002206/1, NE/F006047/1] Funding Source: researchfish
Neodymium isotopes provide a paleoceanographic proxy for past deep water circulation and local weathering changes and have been measured on various authigenic marine sediment components, including fish teeth, ferromanganese oxides extracted by acid-reductive leaching, cleaned foraminifera, and foraminifera with Fe-Mn oxide coatings. Here we compare Nd isotopic measurements obtained from ferromanganese oxides leached from bulk sediments and planktonic foraminifera, as well as from oxidatively-reductively cleaned foraminiferal shells from sediment cores in the North Atlantic. Sedimentary volcanic ash contributes a significant fraction of the Nd when the ferro-manganese (Fe-Mn) oxide coatings are leached from bulk sediments. Reductive leachates of marine sediments from North Atlantic core tops near Iceland, or directly downstream from Iceland-Scotland Overflow Waters, record epsilon(Nd) values that are significantly higher than seawater, indicating that volcanic material is easily leached by acid-reductive methods. The epsilon(Nd) values from sites more distal to Iceland are similar to modern seawater values, showing little contamination from Iceland-derived volcanogenic material. In all comparisons, core top planktonic foraminifera epsilon(Nd) values more closely approximate modern deep seawater than the bulk sediment reductive leached value suggesting that the foraminifera provide a route toward quantifying the Nd isotopic signature of deep North Atlantic water masses.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据