莱洲湾南岸咸水入侵区晚更新世以来的古环境演变(英文)

编号 zgly0001586719

文献类型 期刊论文

文献题名 莱洲湾南岸咸水入侵区晚更新世以来的古环境演变(英文)

作者 张祖陆  刘恩峰  张艳  辛良杰 

作者单位 GeographyDepartmentofShandongNormalUniversity  NanjingInstituteofGeography&LimnologyCAS  InstituteofGeographicSciencesandNaturalResourcesResearchCAS  Jinan250014China  Nanjing210008China  Beijing100101China 

母体文献 Journal of Geographical Sciences 

年卷期 2008年01期

年份 2008 

分类号 P534.631 

关键词 environmentalevolution  salt-waterintrusion  latePleistocene  southcoastalplainofLaizhouBay  China 

文摘内容 The south coastal plain of Laizhou Bay is one of the typical salt-water intrusion areas in China, the occurrence and development of which was closely related with the pa- laeoenvironment evolution. Systematic analyses of pollen, foraminifera and grain size com- position based on 14C and luminescence dating from two sediment cores were performed for the purpose of understanding the salt-water intrusion in the coastal plain of Laizhou Bay from the perspective of environmental evolution since late Pleistocene. It could be classified into seven evolution stages since 120 kaBP: 120–85 kaBP was a transition period from cold to warm; 85–76 kaBP was a period with warm and wet climate having swamp lakes developed in the lower reaches of the Weihe River, south coastal plain of Laizhou Bay; 76–50 kaBP was characterized by grassland vegetation and coarse sediments in terrestrial environment, which was the early stage of Dali Ice-Age; 50–24 kaBP was a period with alternate sea deposition in the south coastal plain of Laizhou Bay; 24–10 kaBP was the late stage of Dali Ice-Age with coldest period of Quaternary, the south coastal plain of Laizhou Bay was dry grassland and loess deposition environment; 10–4 kaBP was another warm and wet climate period, sea level was high and regressed at 4 kaBP; and has been the modern sedimentary environment since 4 kaBP. Among the three warm stages, including 85–76 kaBP, 50–24 kaBP and 10–4 kaBP, corresponded to late Yangkou, Guangrao and Kenli seawater transgression respec- tively. The duration of the latter one in south coastal plain of Laizhou Bay was longer than that in west coast of Bohai Sea and east coast of Laizhou Bay. The three periods of seawater transgression formed the foundation of salt-water intrusion in this area.