中国主要沙尘暴源区稳定同位素背景值初步研究

doi:10.7522/j.issn.1000-694X.2015.00220

摘要/Abstract

摘要： 采用稳定同位素方法,对中国沙尘暴主要源区塔克拉玛干沙漠、柴达木盆地沙漠、库姆塔格沙漠、腾格里沙漠、乌兰布和沙漠、毛乌素沙地进行了采样分析。结果表明:22个样品¹⁸O和³⁰Si的δ值变化范围分别为9.6~14.8和-1.7~0.3,其中¹⁸O的δ值库姆塔格沙漠最大,柴达木盆地沙漠最小,³⁰Si的δ值毛乌素沙地最大,柴达木盆地沙漠最小。总体而言,样品中³⁰Si的δ值的变异系数要比¹⁸O的δ的变异系数大,因此³⁰Si更适合用于沙尘溯源。相邻的沙漠(沙地)呈现出³⁰Si的δ值相近的趋势,因此推断相邻的沙漠(沙地)沉积物可能来自同一地区。

关键词: 沙尘暴, 稳定同位素, 溯源, 背景值

Abstract: By using stable isopote analysis method, we research the stable isotope background values of samples of Taklimakan Desert, Qaidam Basin Desert, Kumtagh Desert, Tengger Desert, Ulan Buh Desert, Mu Us Sandy Land which are the major dust storm source regions in China. The results show that the δ values of ¹⁸O and ³⁰Si of 22 samples range at 9.6-14.8 and -1.7-0.3, respectively. The δ value of ¹⁸O from is the maximum in the Kumtagh Desert, and it is the minimum in the Qaidam Basin Desert. The δ value of ³⁰Si value is maximum in the Mu Us Sandy Land, and is minimum in the Qaidam Basin Desert. Overall, the variation coefficients of δ value of ³⁰Si are greater than the variation coefficient of δ values of ¹⁸O. So, ³⁰Si is more suitable for dust storm source research. Furthermore, the adjacent deserts showed a similar trend of ³⁰Si. Therefore, it is inferred that the sediments of adjacent deserts may come from the same area.

Key words: dust storm, stable isotope, trace ability, background value

中图分类号:

杜宏印, 郭浩, 崔向慧, 芦霞, 辛智鸣. 中国主要沙尘暴源区稳定同位素背景值初步研究[J]. 中国沙漠, 2016, 36(3): 604-609.

Du Hongyin, Guo Hao, Cui Xianghui, Lu Xia, Xin Zhiming. The Stable Isotope Background Values of the Major Source Regions of Dust Storms in China[J]. JOURNAL OF DESERT RESEARCH, 2016, 36(3): 604-609.

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