Evaluating Zr/Rb Ratio From XRF Scanning as an Indicator of Grain-Size Variations of Glaciomarine Sediments in the Southern Ocean
文献类型：期刊论文
| 作者 | Wu, Li1; Wilson, David J.4; Wang, Rujian1; Yin, Xuebo2,3; Chen, Zhihua5; Xiao, Wenshen1; Huang, Mengxue1 |
| 刊名 | GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
 |
| 出版日期 | 2020-11-01 |
| 卷号 | 21期号:11页码:26 |
| 关键词 | bottom currents glaciomarine sediment grain‐ size iceberg rafted debris Southern Ocean XRF core scanning Zr Rb |
| DOI | 10.1029/2020GC009350 |
| 通讯作者 | Wang, Rujian(rjwang@tongji.edu.cn) |
| 英文摘要 | The ln(Zr/Rb) count ratio derived from X-ray fluorescence (XRF) core scanning holds potential as a high-resolution tracer for grain-size variations of glaciomarine sediments, and hence current strength. To evaluate this approach, we conducted high-resolution grain-size measurements, together with Rb and Zr measurements by XRF core scanning and inductively coupled plasma-mass spectrometry (ICP-MS), on a series of sediment cores from different regions of the Southern Ocean. Downcore changes of the ln(Zr/Rb) count ratio from XRF core scanning are consistent with Zr/Rb concentration ratios derived from ICP-MS analyses, even though Rb and Zr counts deviate significantly from concentrations due to specimen and matrix effects. The ln(Zr/Rb) count ratio displays discrepancies with the bulk mean grain-size, but correlates well with the mean grain-size of the sediment fractions that do not include unsorted sand delivered by ice-rafting. These observations are supported by evidence from a grain-size separation experiment, which indicates that Zr and Rb are concentrated in different grain-size fractions. Consistent with its lack of sensitivity to coarse grain-size fractions derived from ice-rafting, the ln(Zr/Rb) ratio records similar trends to the sortable silt percent (SS%) and sortable silt mean (SS over bar ) grain-size. Universal gradients exist in plots of SS% versus ln(Zr/Rb), and SS over bar versus ln(Zr/Rb), such that the ln(Zr/Rb) ratio provides a convenient way to estimate the magnitude of changes in SS% and SS over bar . Overall, our results support the use of the ln(Zr/Rb) ratio as an indicator of bottom current strength in cases where the sediment is current-sorted. |
| 资助项目 | National Natural Science Foundation of China ; Postdoctoral Research Foundation of China[41806223] ; Postdoctoral Research Foundation of China[2018M632158] ; Postdoctoral Research Foundation of China[41776191] ; Postdoctoral Research Foundation of China[41676191] ; Ministry of Natural Resources of China ; National Oceanic Administration's Polar Expedition Office[RFSOCC20202022] ; National Oceanic Administration's Polar Expedition Office[16] ; National Oceanic Administration's Polar Expedition Office[17] |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000595790900027 |
| 出版者 | AMER GEOPHYSICAL UNION |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/169306]  |
| 专题 | 中国科学院海洋研究所 |
| 通讯作者 | Wang, Rujian |
| 作者单位 | 1.Tongji Univ, State Key Lab Marine Geol, Shanghai, Peoples R China 2.Chinese Acad Sci, Inst Oceanol, Qingdao, Peoples R China 3.Qingdao Sparta Anal & Test Co Ltd, Qingdao, Peoples R China 4.Univ London, Univ Coll London & Birkheck, Inst Earth & Planetary Sci, London, England 5.State Ocean Adm, Inst Oceanog 1, Qingdao, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wu, Li,Wilson, David J.,Wang, Rujian,et al. Evaluating Zr/Rb Ratio From XRF Scanning as an Indicator of Grain-Size Variations of Glaciomarine Sediments in the Southern Ocean[J]. GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,2020,21(11):26. |
| APA | Wu, Li.,Wilson, David J..,Wang, Rujian.,Yin, Xuebo.,Chen, Zhihua.,...&Huang, Mengxue.(2020).Evaluating Zr/Rb Ratio From XRF Scanning as an Indicator of Grain-Size Variations of Glaciomarine Sediments in the Southern Ocean.GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,21(11),26. |
| MLA | Wu, Li,et al."Evaluating Zr/Rb Ratio From XRF Scanning as an Indicator of Grain-Size Variations of Glaciomarine Sediments in the Southern Ocean".GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS 21.11(2020):26. |
入库方式： OAI收割
来源：海洋研究所
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