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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。
Daihai is a closed-flow semi-brackish lake on the edge of the East Asian summer monsoon. The variation of precipitation in the catchment catchment tends to trigger changes in lake water level and water chemistry. The DH11-1 core was selected for 1 mm resolution XRF elemental scanning analysis, and the test results were analyzed by multivariate mathematical statistics to identify the relationship between these elements and exogenous debris, authigenic carbonate deposition, Change the link. The results show that Si, Al, Ti, K, Fe, Rb and other elements have good correlation and show similar trend. The contents of Ca, Al and Ti are mainly related to the amount of detrital substances introduced into the main rivers. Self-generated carbonates, namely, aragonite and calcite mineral content changes. The study found that before the serious impact of human activities, the environmental characteristics of Daihai over the past ~ 400 years can be generally divided into four stages. The water level, hydrochemical characteristics and water balance in each stage are different. Generally, precipitation is affected by precipitation in catchment basins Control of changes in volume. In addition, Cu, Zn and Cr in sediments may be related to human activities.