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更尕海现代碎屑物质粒度组成空间分异及其输入过程

, PP. 1199-1208

Keywords: 粒度,湖泊沉积,风沙活动,更尕海,共和盆地

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Abstract:

文章分析了更尕海表层沉积、流域地表沉积、湖泊水体沉积以及岩芯沉积等的粒度组成,并比较了不同沉积类型之间有关的沉积动力联系。更尕海表层沉积具有4种类型的粒度分布模式,其粒度组成由两个端元组分(粗、细颗粒组分)或者二者的混合构成。湖泊现代沉积物表现出自西北向东南逐渐变细的趋势。粗颗粒组分主要由风力输入,反映了流域风场状况或风沙活动的强度(如尘暴事件);而细颗粒组分输入过程复杂,其环境意义需要进一步理解。更尕海沉积岩芯样品具有类似于湖泊表层沉积的粒度组成特征,然而其粗颗粒组分的变化可能还受控于湖泊水域面积的分异作用。未来的工作拟将在合理评价湖泊水位变化的基础上,进一步明确湖泊沉积岩芯中粗颗粒的环境意义。

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