全新世以来长江口底栖有孔虫组合及古环境演化  

SUBASSEMBLAGES OF BENTHIC FORAMINIFERA AND PALAEOENVIRONMENTAL IMPLICATION IN THE YANGTZE RIVER ESTUARY SINCE HOLOCENE

作　　者：蔡庆芳[1] 王飞飞[2] 印萍[2] 刘冬雁[3] 范代读[4] 

机构地区：[1]国土资源部海底矿产资源重点实验室,中国地质调查局广州海洋地质调查局,广州510075 [2]中国地质调查局青岛海洋地质研究所,青岛266071 [3]中国海洋大学海洋地球科学学院,青岛266100 [4]同济大学海洋地质国家重点实验室,上海200092

出　　处：《海洋地质与第四纪地质》2016年第6期175-184,共10页Marine Geology & Quaternary Geology

基　　金：基金项目:长江口重点海岸带综合地质调查

摘　　要：对长江口YD0903孔的底栖有孔虫组合进行了定量统计分析,结合沉积地层学、AMS14 C测年、沉积物粒度等,重建了全新世以来研究区的沉积环境演化。主要划分为6个环境演化阶段:11 260~10 150cal.aBP,以Ammonia beccarii vars.组合为标志的滨岸环境;10 150~7 730cal.aBP,以Epistominella naraensis-Ammonia beccarii vars.奈良小上口虫-毕克卷转虫变种组合为标志的滨岸—浅海过渡环境;7 730~3 610cal.aBP,以Epistominella naraensis奈良小上口虫组合为标志的溶解氧偏低的浅海环境;3 610~2 930cal.aBP,以Quinqueloculinaspp.组合为标志的温度、盐度相对较高的浅海环境;2 930~2 150cal.aBP,以Bolivinaspp.组合为标志的低氧富营养的前三角洲—浅海环境;2 150~220cal.aBP,以Protelphidium tuberculatum组合为标志的低温的前三角洲—浅海环境。According to quantitative statistics interpretation on the foraminiferal assemblages,combined with AMS ^（14）C dating,grain size and geochemistry data of the YD-0903 borehole collected from the offshore of the Yangtze River estuary,this paper discusses the evolution of Holocene palaeoenvironment of the estuary.6 stages of sedimentary environmental evolution of the studied area are defined,i.e.11 260-10 150 cal.aBP,dominated by Ammonia beccarii vars,indicating an estuarine and nearshore environment;10 150-7 730 cal.aBP,dominated by Epistominella naraensis-Ammonia beccarii vars,indicating an estuarine,nearshore to shallow shelf environment;7 730-3 610 cal.aBP,dominated by Epistominella naraensis-Florilus spp.,indicating a hypoxia shallow shelf environment;3 610-2 930 cal.aBP,characterized by Quinqueloculinaspp.,indicating a relatively high temperature and high salinity shallow shelf environment;2 930~2 150 cal.aBP,characterized by Bolivina spp.,indicating a hypoxic and nutrient-rich prodelta to a shallow shelf environment;and 2 150-220cal.aBP,dominated by Protelphidium tuberculatum,indicating a low temperature prodelta environment.

关 键 词：有孔虫 全新世 古环境 长江口 

分 类 号：P736.22[天文地球—海洋地质]