Contribution of aeolian dust in Japan Sea sediments estimated from ESR signal intensity and crystallinity of quartz
Contribution of aeolian dust in Japan Sea sediments estimated from ESR signal intensity and crystallinity of quartz
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DOI：
10.1029/2006gc001364
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发表时间：
2007-02
期刊：
影响因子：
3.7
通讯作者：
K. Nagashima;R. Tada;A. Tani;S. Toyoda;Y. Sun;Y. Isozaki
中科院分区：
文献类型：
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作者：
K. Nagashima;R. Tada;A. Tani;S. Toyoda;Y. Sun;Y. Isozaki
日本海晚第四纪半远洋沉积物中含有来自东亚的风尘，可能记录了亚洲季风和西风急流的过去变化。然而，从日本海沉积物中提取有关风尘的信息是困难的，因为沉积物中还含有来自日本群岛的碎屑物质。在这里，我们提出了一种方法，提取风成尘组分从日本海半远洋沉积物中使用不同粒度级的物源分析。日本海的半远洋沉积物可以由两个具有不同中值粒度的对数正态粒度分布的群体组合来描述，这两个群体被称为较粗（2-15 μm）和较细（<10 μm）群体。我们的特征在于这些人口的来源分析的基础上，使用电子自旋共振（ESR）信号强度和结晶度的石英。结果表明，石英在较粗的人口已主要来自中国北方和西伯利亚/东北中国的风成输送，而石英在较细的人口已占主导地位的河流排水日本群岛。
Late Quaternary hemipelagic sediments in the Japan Sea contain aeolian dust from East Asia which potentially records past variations in the Asian monsoon and the westerly jet. However, extracting information about aeolian dust from Japan Sea sediments is difficult because the sediments also contain detrital material from the Japanese Islands. Here we present a method for extracting the aeolian dust components from Japan Sea hemipelagic sediments using provenance analysis of different size fractions. Hemipelagic sediments of the Japan Sea can be described by a combination of two populations characterized by lognormal grain size distributions with different median grain sizes, which are called the coarser (2–15 μm) and the finer (<10 μm) populations. We characterized these populations on the basis of provenance analyses, using the electron spin resonance (ESR) signal intensity and crystallinity of quartz. The results suggest that quartz in the coarser population has been mostly supplied from Northern China and Siberia/northeastern China by aeolian transport, whereas quartz in the finer population has been dominantly supplied by rivers draining the Japanese Islands.