5000年以来滇中抚仙湖沉积物中Zr/Rb变化特征及其环境意义
首发时间:2018-10-10
摘要:Zr/Rb可以有效揭示湖泊沉积物的粒度特征,进而反映湖泊流域的风化强度。Zr,Rb是表生地球化学过程的两种稳定元素,其两者在各自的性质上存在着显著的差异,即Zr往往赋存于粗颗粒物质中,而Rb则分布于细颗粒物质中。XRF岩芯扫描分析方法具有无损、分辨率高等优势,可以帮肋识别历史过程中与人类活动相对应的环境突变事件,研究区域抚仙湖是典型的高原深水湖泊,同浅水湖泊相比,深水湖泊所受扰动更小,是记录区域环境变化的优良载体。本文利用X射线荧光光谱扫描仪对深水湖泊抚仙湖沉积物岩芯中的Zr、Rb元素进行扫描,在Zr、Rb地球化学过程理论的基础上对Zr/Rb指标进行分析。研究发现,滇中地区近5000年来的环境变化共经历了三个阶段。综上,利用XRF岩芯扫描技术对深水湖泊中的环境代用指标进行分析在反映区域环境变化与人类活动方面具有良好的应用前景。
关键词: XRF岩芯扫描 Zr/Rb比值 人类活动 抚仙湖流域 西南季风
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Paleoenvironmental significance and variation of Zr/Rb ratio change features in lacustrine sediments in Lake Fuxian during the past 5 ka
Abstract:Zr/Rb can effectively reveal the grain size characteristics of lake sediments, then reflect the weathering intensity of lake basins. Zr, Rb are two stable elements of epigenetic geochemical processes, and there are significant differences in their respective properties, that is, Zr is often present in coarse particulate matter, while Rb is distributed in fine particulate matter. The XRF core scanning analysis method has the advantages of non-destructive and high resolution, which can identify environmental abrupt events and human activities in historical process. The study area Fuxian Lake is a typical plateau deep-water lake, Compared with shallow lake,deep-water lakes are less disturbed and are excellent carriers for recording regional environmental changes. In this paper, the Zr and Rb elements in the sediment core of Fuxian Lake in deep-water lakes were scanned by X-ray fluorescence spectrometer,the Zr/Rb index was analyzed based on the geochemical process theory of Zr and Rb. This study found thatthe environmental changes in the Dianzhong Basin over the past 5,000 years have three stages. In summary, use XRF core scanning method to analyze the environmental proxy indicators in deep-water lakes has a good application prospect in reflecting regional environmental changes and human activities.
Keywords: XRF core scanning Zr/Rb ratio Human activityes Fuxian Lake watershed Houthwest monsoon
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5000年以来滇中抚仙湖沉积物中Zr/Rb变化特征及其环境意义
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