| 岱海近400年以来的环境变化:高分辨率XRF岩芯扫描结果的研究 |
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| 引用本文： | 辛首臻,成艾颖,余俊清,高春亮,洪荣昌,张丽莎.岱海近400年以来的环境变化:高分辨率XRF岩芯扫描结果的研究[J].盐湖研究,2015(2):1-6, 33. |
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| 作者姓名： | 辛首臻 成艾颖 余俊清 高春亮 洪荣昌 张丽莎 |
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| 作者单位： | 中国科学院青海盐湖研究所;中国科学院大学 |
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| 基金项目： | 国家自然科学基金(41471013,41171171,40871008);青海省自然科学基金(2014-ZJ-930Q) |
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| 摘 要： | 岱海是东亚夏季风边缘地带的闭流型半咸水湖泊,其汇水流域降水量的变化易于引发湖泊水位和水化学变动。选用DH11-1岩芯进行1 mm分辨率XRF元素扫描分析,并对测试结果进行多元数理统计分析,旨在查明这些元素与外源碎屑、自生碳酸盐沉积以及岱海水位、水化学变化的关联。结果显示,Si、Al、Ti、K、Fe、Rb等元素相关性好,并呈现相似的变化趋势,其含量变化与主要河流带入的碎屑物的多寡有关;Ca元素主要反映沉积物中自生碳酸盐即文石和方解石矿物含量的增减。研究发现,在人类活动严重影响之前,岱海在过去~400年期间的环境特征总体可划分为4个阶段,各阶段的水位、水化学特征及水量平衡有所不同,总体受汇水盆地降水量变化的控制。此外,沉积物中Cu、Zn、Cr可能与人类活动影响有关。
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| 关 键 词： | 湖泊水量平衡 XRF岩芯扫描 元素地球化学 湖泊沉积 |
Environmental Change of Lake Daihai in the Past 400 Years:Implications from High-resolution Element Records from XRF Core Scanning Analysis |
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| XIN Shou-zhen;CHENG Ai-ying;YU Jun-qing;GAO Chun-liang;HONG Rong-chang;ZHANG Li-sha.Environmental Change of Lake Daihai in the Past 400 Years:Implications from High-resolution Element Records from XRF Core Scanning Analysis[J].Journal of Salt Lake Research,2015(2):1-6, 33. |
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| Authors: | XIN Shou-zhen;CHENG Ai-ying;YU Jun-qing;GAO Chun-liang;HONG Rong-chang;ZHANG Li-sha |
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| Institution: | XIN Shou-zhen;CHENG Ai-ying;YU Jun-qing;GAO Chun-liang;HONG Rong-chang;ZHANG Li-sha;Qinghai Institute for Salt Lakes,Chinese Academy of Sciences;University of Chinese Academy of Sciences; |
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| Abstract: | :Lake Daihai is a brackish and closed-basin lake located on the margin of East Asia Summer Monsoon region.Its water level and chemical respond sensitively to the changes of precipitation in the drainage basin.The elements of core DH11-1 were analyzed by XRF core scanning with a resolution of 1 mm,then,the correlation between elements and allogenic detritus authigenic carbonate in association with water level and hydrochemical change was ascertained by multivariate statistical methods.The results show that elements Si,Al,Ti,K,Fe and Rb are well correlated,displaying a similar variation pattern,and the element contents are related to the quantity of detrital minerals transported into Lake Daihai by main rivers.The element Ca mainly reflects the fluctuation of aragonite and calcite in the sediments.Heavy metal elements Cu,Zn and Cr may be related to human activities.Finally,the authors divided the environmental history of Lake Daihai into 4 stages in the last 400 years before significant disturbance from human activities.The water level,hydrochemical characteristics and hydrologic budget are different from each other for the 4 stages,and are overall controlled by precipitation fluctuations in the drainage basin. |
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