VARIATION IN LOSS ON IGNITION OF THE NILKA LOESS SECTION IN THE YILI BASIN AND ITS IMPACT FACTORS
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摘要: 对新疆伊犁尼勒克黄土剖面513个样品进行了550℃和950℃高温烧失量分析以及X射线衍射矿物学分析,并将其烧失量与剖面中碳酸盐、有机质、μm的黏粒含量进行了相关性分析。结果表明:对于位于西风区的伊犁尼勒克黄土,550℃高温烧失量变化可以反映土壤中有机质和束缚水的含量变化,而黏粒成分对550℃高温烧失量贡献较大;950℃高温烧失量变化可以用来反映伊犁地区黄土碳酸盐的变化趋势。根据碳酸盐含量变化所指示的气候环境意义推断出高的950℃高温烧失值反映冷干的气候环境,低的950℃高温烧失值反映比较湿润的气候环境,这对于研究伊犁地区黄土古土壤形成时期的古气候环境有重要的意义,同时证明了可以将烧失量这一简便、快捷的方法用于西风区黄土堆积序列的研究中。Abstract: 513 loess samples from the Nilka section in the Yili basin, Xinjiang, have been analyzed for Loss on Ignition (LOI) at 550℃and 950℃respectively. Correlation analysis has been carried out among the organic matter, fine components μm, carbonate and high-temperature LOI. X-ray diffraction has been used to identify the mineral composition after representative samples were burned. The results show that the clay fractions (μm) of the Nilka loess have some correlation to the LOI variations at 550℃, which reflects the changes in soil organic matter and bound water. And the LOI at 950℃ can reflect the content of soil carbonate. In other words, the contents of carbonate of the Nilka loess is positively related to the LOI at 950℃. Thus we can infer that the high value of LOI at 950℃ represent a cold and dry climate while the low value reflects a warm and wet climate. These conclusions have a profound significance for understanding the paleoclimatic conditions of the loess-paleosol development in Yili region. This also suggests that the LOI is a simple and fast method for paleoclimatic studies of loess sediments in the westerly-dominated Yili region.
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Key words:
- loss on ignition /
- carbonate /
- westerly area /
- Nilka loess section /
- paleoclimatic significance
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