Element composition of dust from a shallow Dunde ice core, Northern China

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• 作者：Guangjian Wu ; Chenglong Zhang ; Shaopeng Gao ; T ; ong Yao ; Lide Tian ; Dunsheng Xia
• 关键词：Asian dust ; Dunde ice core ; element composition ; Tibetan Plateau
• 刊名：Global and Planetary Change
• 出版年：2009
• 出版时间：June 2009
• 年：2009
• 卷：67
• 期：3-4
• 页码：186-192
• 全文大小：863 K

文摘

The Dunde ice cap (38°06'N, 96°24'E, with a summit of 5325 m) is situated at the centre of the northern Chinese deserts and receives dust from these regions. Here, we present the trace and rare earth element (REE) compositions of dust extracted from a shallow ice core from the Dunde ice cap, which provide a framework to trace the source of Dunde dust. Trace and REE parameters of Dunde dust show characteristics of a typical eolian deposit, with an average La/Th ratio of 2.6, a Th/U ratio of 3.7, and a strong negative Eu anomaly (0.61). The dirty layers in the ice core section have the same element characteristics as in the clear layers, indicating that the dust in Dunde is well-mixed and has a stable composition. Trace element and REE ratio plots show that Dunde dust has a similar composition to the finer fraction materials in the Taklimakan desert, suggesting that the Tarim Basin might be an important source for Dunde dust under the present circulation, but not favoring a material contribution from Badain Jaran. Our results reveal distinct differences in composition between Dunde dust and Chinese loess materials, which suggests that they have different sources.