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A model for linking grain-size component to lake level status of a modern clastic lake

机译：将碎屑成分与现代碎屑湖的湖面状态联系起来的模型

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摘要

Grain-size distributions of fluvial, eolian and marine sediments were explicated decades ago. For lake sediments, however, there is still great uncertainty in explaining the genesis of grain-size components due to the inherent complexity of their polymodal distributions. In this study, the grain-size components of the surface sediments of Daihai Lake, Inner Mongolia, were partitioned using a lognormal distribution function and the relationship between the identity of each component and the specific sedimentary environment was investigated. The data indicate that the modern clastic sediments of Daihai Lake contain five distinct unimodal grain-size distributions representing five grain-size components. Each of the components retains its identity including modal size, manner of transportation and environment of deposition although the relative percentage varies with the hydraulic condition throughout the lake. These components are specified from fine to coarse modes as long-term suspension clay, offshore-suspension fine silt and medium-to-coarse silt, and nearshore-suspension fine sand and saltation medium sand. The percentage of the components interpreted as an indication of nearshore environments displays a negative correlation with water depth across the modern lakebed, suggesting a model for linking the nearshore components in sediment cores to the lake level status in the geological past. The model was applied to a sediment core from the lake where high percentages of the nearshore components in the core sediments were correlated with low regional precipitations reconstructed on the pollen profile of the same core. The coincidences between two independent proxies do not only demonstrate the validity of lognormal distribution function in partitioning polymodal sediments but also reveals the potential of the grain-size component-lake level status model for lake's paleohydrological reconstruction.
机译：河流，风沙和海洋沉积物的粒度分布在几十年前就已阐明。然而，对于湖泊沉积物，由于其多峰分布的内在复杂性，在解释粒度成分的成因方面仍然存在很大的不确定性。本研究利用对数正态分布函数对内蒙古岱海表层沉积物的粒度组成进行了划分，并研究了各组分的同一性与特定沉积环境之间的关系。数据表明，岱海现代碎屑沉积物具有五个不同的单峰粒度分布，分别代表五个粒度成分。尽管相对百分比随整个湖泊的水力状况而变化，但每个组件都保留了其特征，包括模式大小，运输方式和沉积环境。这些成分从细到粗模式分别指定为长期悬浮粘土，海上悬浮细粉砂和中粗砂，近岸悬浮细砂和盐分中砂。解释为近岸环境指示的组分百分比与整个现代湖床的水深呈负相关，这提出了一个模型，用于将沉积物芯中的近岸组分与地质过去的湖平面状态联系起来。该模型被应用于湖中的沉积物核心，其中核心沉积物中高比例的近岸成分与在相同核心的花粉剖面上重建的低区域降水相关。两个独立代理之间的巧合不仅证明了对数正态分布函数在划分多式联运沉积物方面的有效性，而且还揭示了粒度组分-湖水位状态模型在湖泊古水文重建中的潜力。

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  • 来源
    《Journal of Asian earth sciences》 |2013年第6期|149-158|共10页
  • 作者

    Jule Xiao; Jiawei Fan; Lang Zhou; Dayou Zhai; Ruilin Wen; Xiaoguang Qin;

  • 作者单位

    Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;

    Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;

    Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;

    Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;

    Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;

    Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;

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  • 正文语种 eng
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  • 关键词

    Daihai Lake; Polymodal sediment; Grain-size component; Water depth; Offshore distance; Lake-level status;

    机译：岱海多峰沉积物;粒度成分;水深;离岸距离湖水位;

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