全新世海侵以来山东荣成朝阳港泻湖沉积层与古环境记录  

The Sediment Layers and the Records of the Paleoenvironment in the Chaoyanggang Lagoon,Rongcheng City of Shandong Province Since Holocene Transgression

作　　者：周江[1] 刘冬雁[2] 庄振业[2] 王祖正[1] 刘利东[1] 

机构地区：[1]天津师范大学城市与环境科学学院,天津300387 [2]中国海洋大学海洋地球科学系,山东青岛266100

出　　处：《中国海洋大学学报（自然科学版）》2008年第5期803-808,共6页Periodical of Ocean University of China

基　　金：海洋沉积物与环境地质国家海洋局重点实验室开放基金项目(MASEG200601)资助

摘　　要：泻湖是全新世海侵以来发育的以淤积为主的海岸地貌,其沉积地层蕴含了丰富的古环境演变信息。对朝阳港泻湖SO4钻孔岩芯样品作粒度、软体动物、孢粉和14C等项目的测试分析,将该孔地层自下而上划分成陆相、滨浅海相、泻湖相、泻湖-沼泽相等四层和Ⅰ,Ⅱ,Ⅲ,Ⅳ个孢粉组合带。基于对地层和孢粉组合特点的深入剖析,结果表明朝阳港泻湖自全新世海侵以来经历了海湾、沙坝-泻湖和泻湖-沼泽等3个环境演化阶段,同时存在明显的沉积环境和气候变化事件,包括8～7 ka B.P.海陆相之间的不整合沉积间断事件、7～6 ka B.P.的气候暖湿事件和5～4 ka B.P.的明显降温事件。Lagoon is the coastal landscape developed by the deposition mainly since Holocene transgression, and the stratigraphic of which contains a wealth of paleo-environment evolution information. Based on the analysis of lithological features, microfossils, sporopollen and ^14C dating of the core SO4 samples from the Chaoyanggang lagoon, the stratigraphic of the core is divided into four beds including the con-tinental bed, the coastal bed, the lagoon bed and the lagoon-marsh bed, and the sporopollen zones of the core have been distinguished into zone Ⅰ , zone Ⅱ, zone Ⅲ and zone Ⅳ. Based on the in-depth analysis of the characteristics of stratigraphic and the sporopollen, the results show that since the Holocene transgression the Chaoyanggang lagoon has experienced three stages of environment evolution which are named gulf, bar-lagoon and lagoonmarsh. In the meantime there are obvious deposition environment and climate change events which include the sedimentary sea-land interruption event in the 8--7 ka B. P., the Holocene warm and humid climate event in the 7--6 ka B.P., and the climatic decline event in the 5-4 ka B. P..

关 键 词：朝阳港泻湖 全新世海侵 孢粉组合 地质事件 

分 类 号：P736.2[天文地球—海洋地质]