首页|长岛第四纪黄土中的有孔虫化石分布特征及指示意义

长岛第四纪黄土中的有孔虫化石分布特征及指示意义

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通过对取自长岛4个黄土剖面(北长山岛店子剖面、南长山岛王沟剖面、大黑山岛北庄剖面、砣矶岛后口剖面)中有孔虫化石的鉴定统计,总结了长岛第四纪黄土中有孔虫化石分布特征.结果表明,在4个黄土剖面中,北长山岛店子剖面有孔虫化石绝对丰度最高,平均值为13.11枚/50克;后口、王沟、北庄剖面有孔虫化石丰度分别为2.26枚/50克、0.56枚/50克、0.11枚/50克.北长山岛店子剖面有孔虫化石群落以浮游有孔虫为主,主要属种有Globigerinoides ruber,Neogloboquadrina dutertrei和Globigerinoides sacculifer等,其余剖面保存的有孔虫化石以底栖有孔虫为主.有孔虫化石属种的差异指示了黄土物质的不同来源,推测黄土中的底栖有孔虫化石来源为近源的渤海海底沉积物,末次冰期海平面下降、海底荒漠化,经风力搬运而来;浮游有孔虫则可能来自于远源的东海,末次间冰期时由黄海暖流带入渤海,末次冰期时出露,受风力搬运作用堆积到长岛各岛屿.
DISTRIBUTION CHARACTERISTICS OF THE FORAMINIFERAL FOSSILS IN THE QUATERNARY LOESS OF THE CHANGDAO ISLANDS AND THEIR SIGNIFICANCE
The distribution characteristics of the foraminiferal fossils in the Quaternary loess of the Changdao Islands were summarized through the identification and statistics of foraminifers from four loess sections(Dianzi section in the Beichangshan Island,Wanggou section in the Nanchangshan Island,Beizhuang section in the Daheishan Island,and Houkou section in the Tuoji Island).The results show that the absolute abundance of foraminiferal fossils in Dianzi section is the highest among the four sections with an average value of 13.11 specimen/50 g,and the abundance of foraminifera fossils in Houkou,Wanggou and Beizhuang sections was 2.26 specimen/50 g,0.56 specimen/50 g and 0.11 specimen/50 g,respectively.The foraminiferal fossil component in the Dianzi section is mainly of the planktonic species,such as Globigerinoides ruber,Neogloboquadrina dutertrei and Globigerinoides sacculifer.The foraminifers preserved in other sections are mainly benthic.These difference of the foraminiferal components proposed a various sources of the loess material or possibly from the different periods.It is speculated that the benthic foraminiferal fossils were derived from the near-source seabed sediments of Bohai Sea,which were transported by wind during the sea level lowstand and seabed desertification during the last glacial period.Planktonic foraminifers might come from the East China Sea,be carried into the Bohai Sea by the Yellow Sea warm current during the last interglacial period,and emerge during the last glacial period,and be transported by wind to the Changdao Islands.

foraminiferal fossilloessQuaternaryChangdao Islands

仇晓华、王奎峰、王兆忠、常凤鸣、王圣雯、陈海涛、孙思涵

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山东省地质科学研究院,自然资源部海岸带科学与综合管理重点实验室,山东省黄河流域土壤修复技术创新中心,山东省海岸带评价与规划工程技术协同创新中心,济南 250013

中国科学院海洋地质与环境重点实验室,青岛 266071

山东省第一地质矿产勘查院,济南 250100

青岛海洋科技中心海洋地质过程与环境功能实验室,青岛 266237

营特国际工程咨询集团有限公司,济南 250014

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有孔虫化石 黄土 第四纪 长岛

山东省地质勘查基金项目崂山实验室科技创新项目黄土与第四纪地质国家重点实验室开放基金项目山东省政府公派出国留学项目自然资源部海岸带科学与综合管理重点实验室基金山东省地矿局科研基金山东省地质勘查基金项目

鲁勘字20228号LSKJ202204903SKLLQJ21142019020062021COSIMQ0062021DW05鲁勘字20239号

2024

微体古生物学报
中国科学院南京地质古生物研究所

微体古生物学报

CSTPCD北大核心
影响因子：0.65
ISSN：1000-0674
年,卷(期)：2024.41(3)