SUBASSEMBLAGES OF BENTHIC FORAMINIFERA AND PALAEOENVIRONMENTAL IMPLICATION IN THE YANGTZE RIVER ESTUARY SINCE HOLOCENE
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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、AMS14C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:11 260~10 150 cal. aBP,以Ammonia beccarii vars. 组合为标志的滨岸环境;10 150~7 730 cal. 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;7 730~3 610 cal. 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;3 610~2 930 cal. aBP,以Quinqueloculina spp. 组合为标志的温度、盐度相对较高的浅海环境;2 930~2 150 cal. aBP,以Bolivina spp.组合为标志的低氧富营养的前三角洲-浅海环境;2 150~220 cal. aBP,以Protelphidium tuberculatum组合为标志的低温的前三角洲-浅海环境。Abstract: According to quantitative statistics interpretation on the foraminiferal assemblages, combined with AMS 14C 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 Quinqueloculina spp., 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 2 150~220 cal.aBP, dominated by Protelphidium tuberculatum, indicating a low temperature prodelta environment.
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Keywords:
- foraminifera /
- Holocene /
- Palaeoenvironment /
- Yangtze River Estuary
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