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Grain-size Characteristics of Wulugu Lake Sediments and Its Palaeoclimate and Palaeoenvironment Implication
Author(s): 
Pages: 877-882
Year: Issue:  6
Journal: ACTA SEDIMENTOLOGICA SINICA

Keyword:  粒度特征古气候环境乌伦古湖;
Abstract: 利用乌伦古湖沉积钻孔的粒度资料,分析了粒度频率曲线、粒度参数和粒度组成等粒度特征,并探讨了乌伦古湖粒度代表的古气候意义.结果表明乌伦古湖沉积物频率曲线主要是正态单峰型,反映流水作用为主要沉积作用.岩芯下部(225~197 cm)沉积物分选较差,偏度和尖度较大,为浅水沉积环境;中部(197~103 cm)分选由差变好,物源由复杂变单一,为浅水沉积向深水沉积过渡环境;上部(103~0 cm)分选较好,物源单一,中值粒径减小,反映了湖水位的下降.沉积物粒度特征反映了乌伦古湖地区全新世降水、流水和风力作用以及湖面水位高低的变化.乌伦古湖一万年来的古气候环境演化大致经历了10 250~7 720 cal.aBP的干旱、7 720~2 800 cal.aBP的湿润和2 800 cal.aBP以来的偏干三个阶段.
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