【作者】 董艺辛； 刘春莲； 杨小强； 高芳蕾； 陈亮； 庄畅； 严伟术；

【Author】 DONG Yi-xin;LIU Chun-lian;YANG Xiao-qiang;GAO Fang-lei;CHEN Liang;ZHUANG Chang;YAN Wei-shu;Department of Earth Sciences,Sun Yat-sen University;

【机构】 中山大学地球科学系；

【摘要】 目的对取自广州番禺东涌PD孔的晚第四纪珠江三角洲沉积进行了微体生物群分析。方法根据微体生物的古生态学及分布特征,并结合有机碳、氮以及磁化率数据。结果共发现有孔虫6属10种,根据它们的生态分布和共生组合关系,可划分为3个组合;PD孔的介形类共7属9种,丰度较低,在5个层位相对富集。PD孔晚第四纪沉积可划分为6个沉积环境阶段,由下至上分别为:前缘浅滩相—河口湾相—三角洲平原相—三角洲平原相(风化剥蚀)—潮坪相—三角洲平原相,表明这一地区晚第四纪古环境的演化是由海平面升降变化控制的。结论总体上反映了2次海平面上升、下降旋回(25.1~22.7 ka B.P.和3.7 ka B.P.以来),分别相应于晚更新世的玉木亚间冰期和中国全新世大暖期更多还原

【Abstract】 Aim Foraminifera and ostracods from Late Quaternary core sediments of the Pearl River Delta have been analyzed in this paper to reconstruct palaeoenvironment.Methods Microfaunal analyses,combined with the data of organic carbon,nitrogen and susceptibility.Results Ten species from six genera of foraminifera have been identified.They can be divided into three assemblages according to stratigraphical distribution.Seven ostracod species referred to nine genera have been collected from five horizons.The core is subdivided into six stages from base to top:A.frontal shore facies,B.estuarine facies,C.delta plain facies,D.delta plain facies(with weathering process),E.tidal flat facies,and F.delta plain facies.Conclusion In the Late Quaternary sequence of this area two transgression-regression cycles can be recognized:Stages A to D and E to F,respectively.The palaeoenvironmental changes are believed to have been controlled by frequent fluctuations of the sea level.更多还原