江苏江都市大桥镇晚更新世晚期—全新世有孔虫动物群的发现及其地质意义  

Discovery and Geological Significance of Late Pleistocene-Holocene Marine Facies Foraminifer Assemblage in Daqiao Town,Jiangdu,Jiangsu Province

作　　者：韦一[1,2] 韩芳[1,2] 魏乃颐[3] 于庆文[4] 张智勇[5] 张克信[1,2] 

机构地区：[1]中国地质大学地球科学学院,武汉430074 [2]中国地质大学生物地质与环境地质国家重点实验室,武汉430074 [3]中国地质调查局南京地质调查中心,南京210016 [4]中国地质调查局基础部,北京100037 [5]中国地质调查局发展研究中心,北京100037

出　　处：《地质科技情报》2011年第3期41-47,共7页Geological Science and Technology Information

基　　金：中国地质调查局项目(1212010611101;1212010781020;121011121261);国家地质学理科基地人才培养基金(J0830520)

摘　　要：在江苏省江都市ZKA4钻孔孔深4.0～42.6 m岩心段中发现有孔虫化石,鉴定识别出有孔虫38属56种,其中9个未定种,根据有孔虫动物群在钻孔剖面上的分布规律,建立了3个有孔虫化石组合,自上而下为:Ammonia beccarii(Linne)vars.-Orbulina universa组合,Ammonia beccarii(Linne)vars.-Cibicidoides bellus组合和Ammonia beccarii(Linne)vars.-Lagena sreiata组合,并将钻孔的有孔虫化石组合与国内其他地区相同层位的有孔虫化石组合对比,将滆湖组的时代厘定为晚更新世晚期,将如东组的时代厘定为全新世。据光释光测年结果,ZKA4钻孔有孔虫动物群始现年龄(孔深42.6～42.8 m)约为(14.2±0.6)ka,该有孔虫动物群是末次冰期冰后期大海侵的产物,此次海侵可细分为两个次一级旋回,影响区域达江苏省西部。Diverse and abundant foraminifer fossils were found in the bore ZKA4 in Jiangdu,Jiangsu Province.This research was made based on 56 species of foraminifer that belong to 38 generas,including 9 undefined species.According to their distributions,the foraminifer assemblages have been observed： Ammonia beccarii（Linne） vars.-Orbulina universa assemblage,Ammonia beccarii（Linne） vars.-Cibicidoides bellus assemblage and Ammonia beccarii（Linne） vars.-Lagena sreiata assemblage.The correlation of the foraminifer assemblages in the bore with the foraminifer fauna worldwide in the same stratum indicates that the age of Gehu Formation is Late Pleistocene,and the age of Rudong Formation is Holocene.According to the result of the optically stimulated luminescence dating,the beginning age of the foraminifer fauna of the bore ZKA4（depth 42.6-42.8 m） is about（14.2±0.6）ka,which is the result of the great transgression of the late last glacier.The transgression can be subdivided into two second cycles,the influence of which reaches the western Jiangsu Province.

关 键 词：ZKA4孔 晚更新世—全新世 有孔虫化石组合 海侵 江都市 

分 类 号：Q911.23[天文地球—古生物学与地层学]