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通过对长江口北支XL1、XL2和CY孔有孔虫组合进行对比分析,综合沉积物粒度特征和环境磁学特征,探讨了长江口北支沉积环境水动力条件演变特点。揭示了长江口北支各沉积相所对应的有孔虫组合,即潮流沙脊以E.naraensis、E.magellanicum和F.decorus组合为主;潮汐水道以A.convexidorsa、E.naraensis、E.magellanicum和A.bec-cariivars.组合为主;潮滩有孔虫组合则以A.beccarii vars.、E.magellanicum、E.naraensis和滨海沼泽特征种T.inflata及J.macrescens组合为主;河口沙坝则以A.beccarii vars.、E.naraensis等组合为主的沉积特征。
By comparing the pore foraminiferal assemblages of XL1, XL2 and CY in the northern branch of the Changjiang Estuary and analyzing the characteristics of grain size and environmental magnetic characteristics of the sediments, the evolution characteristics of hydrodynamic conditions in the north branch of the Yangtze Estuary were discussed. The assemblage of foraminifera corresponding to each sedimentary facies in the northern branch of the Yangtze Estuary was revealed, that is, tidal flow ridges were dominated by E.naraensis, E.magellanicum and F. decorus. The tidal channels were A.convexidorsa, E.naraensis, magellanicum and A.bec-cariivars. The combination of tidal flat and foraminifera with A.beccarii vars., E.magellanicum, E.naraensis and T.inflata and J.macrescens, Shaba Zeyi A. Beccarii vars., E.naraensis and other combinations of sedimentary characteristics.