ENVIRONMENTAL EVOLUTION OF THE NORTHERN YELLOW SEA MUDDY AREA DURING HOLOCENE BASED ON BENTHIC FORAMINIFERAL RECORDS
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摘要: 对取自北黄海泥质沉积区的3个柱状沉积物样品中的底栖有孔虫群落进行了分析,结果表明,研究区附近全新世以来的海洋环境演化受控于海平面的上升过程和周围陆源淡水的强烈影响,13.7 cal.kaBP以来底栖有孔虫群落变动可以划分为3个阶段:13.7~9.2 cal.kaBP以近岸广温广盐种为主,代表了低温低盐的滨岸环境;9.2~5 cal.kaBP Elphidium magellanicum成为绝对优势种,代表了受到陆源淡水强烈作用的缺氧富营养环境;5 cal.kaBP以来以Buccella frigida和Protelphidium turberculatum为优势种,代表了与目前相似的冷涡边缘的冷水环境。Abstract: Benthic foraminiferal assemblage in the three cores taken from the northern Yellow Sea muddy area during 2006 were analyzed for reconstructing environmental evolution. Data show that the marine environment of the study area has been strongly influenced by the Post-glacial transgression process and the fresh water input of adjacent rivers. The variation in benthic foraminiferal assemblage could be divided into three stages since 13.7 cal.kaBP:Eurythermal and euryhaline species dominated the fauna during 13.7~9.2 cal.ka BP, denoting a littoral environment with low temperature and low salinity; E. magellanicum became the absolute imperium during 9.2~5 cal.kaBP, denoting the anoxic but nutrient environment strongly influenced by the great runoff input; B.frigida and P.turberculacum took the dominant position after 5 cal.kaBP, indicating the affect by the marginal cold water from the northern Yellow Sea.
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