摘要
对江苏省盐城市大丰区野鹿荡DF20钻孔21 m长沉积物岩芯开展了详细微体古生物学定量分析研究,结果显示,沉积物中浮游有孔虫仅在下部部分层位少见,含丰富的底栖有孔虫化石。研究共识别出47属66种底栖有孔虫,尤其以Ammonia beccarii var.,Cribrononion vitreum,Cribrononion subincertum,Elphidium advenum,Pseudononionella variabilis,Stomoloculina multangula,Elphidium magellanicum,Pararotalia nipponica,Elphidium hispidulum和Ammonia compressiuscula等近岸和内陆架浅水分子高含量为主。其中Ammonia beccarii var.最高达87.5%,平均含量超过50%。结合钻孔底部沉积物中贝壳的初步测年资料,该钻孔底栖有孔虫组成和变化揭示了野鹿荡地区近七千年来沉积环境存在一个由相对较深的近岸浅水海洋环境向海陆过渡相半咸水环境的演化过程。
Core DF20,drilled from the Yeludang area,Dafeng,northern Juangsu province,was taken to analyze the foraminiferal composition and to reconstruct the paleo-environmental change in this region during the middle–late Holocene(based on the preliminary age of the base sample dating).61 samples from Core DF20 consist of abundant foraminiferal specimens,most of them are benthic types,including 47 genera and 66 species,while rarely planktonic specimens were found in the lower part of the core.The dominant benthic foraminiferal species is Ammonia beccarii var.,which is more than 50% in average with a highest content of 87.5% in the upper layer.The other species of marinecontinental transitional environment or of the inner shell were found to be the abundant components from Core DF20,such as Cribrononion vitreum,Cribrononion subincertum,Elphidium advenum,Pseudononionella variabilis,Stomoloculina multangula,Elphidium magellanicum,Pararotalia nipponica,Elphidium hispidulum and Ammonia compressiuscula(in descending order of the relative content).This assemblage suggests a temperate near-shore/shallow marine water.Down-core variations of the benthic foraminiferal components imply a relative warmer,salty and deeper inner shelf sedimentary environment for the middle/lower part,contrary to a relatively brackish shoaling water for the upper part in the core.
作者
李保华
张楷
徐烨
范代读
LI Baohua;ZHANG Kai;XU Ye;FAN Daidu(State Key Laboratory of Palaeobiology and Stratigraphy,Nanjing Institute of Geology and Palaeontology,and Center for Excellence in Life and Paleoenvironment,Chinese Academy of Sciences,Nanjing 210008,P.R.China;State Laboratory of Marine Geology,Tongji University,Shanghai 200091,P.R.China)
出处
《微体古生物学报》
CSCD
北大核心
2022年第4期339-347,共9页
Acta Micropalaeontologica Sinica
基金
中国科学院战略性先导科技专项B类(XDB26000000)资助。
关键词
有孔虫
古环境
全新世
苏北滨岸
foraminifera
paleoenvironment
Holocene
northern Jiangsu coast
