莱州湾南岸巨淀湖沉积地层分析与沉积环境辨识

湖相沉积地层中沉积物的岩性特征、粒度特征和孢粉组合特征具有良好的环境指示作用,本文对位于莱州湾南岸平原上的巨淀湖沉积地层进行了研究。通过对沉积物的岩性特征和粒度特征进行分析,划分出了湖区的垂向沉积序列。通过地层对比并结合¹⁴C测年数据,确定了湖区全新世泻湖-浅海-海滩相沉积层的层位和特征,并对该层及其以上地层进行了地层划分,判断出各层的沉积环境。通过对选取样品进行孢粉分析,并结合邻近地区的孢粉组合特征和气候环境特征,得出了该湖区中全新世以来的气候环境特征。

Sedimentary Analysis and Environmental Evolvement of Judian Lake in the South Coastal Plain of Laizhou Bay

Because the rock characteristics,granularity features and spore-pollen assemblage features of sedimentary material in lake facies can be used to show the environment,Judian Lake sedimentary area which lies in the south coastal plain of Laizhou Bay is studied on sedimentology.The vertical sedimentary sequence of this sedimentary area is divided combining with the granularity features and rock characteristics of sediments.By comparing with the strata of "Holocene Series of the coastal plain of Laizhou Bay" and combining ~(14)C age measurement,the strata position,features of the lagoon-shallow sea-beach sedimentary facies and the sedimentary environment of each stratum are confirmed.By spore-pollen analysis of 10 samples and the features of spore-pollen assemblage and climatic environment,the features of environmental evolvement in the south coastal plain of Laizhou Bay since the Middle Holocene were summarized.