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将长江三角洲北翼如东县兵房孔(BF10)岩芯自下而上分为5个阶段(A,B,C,D和E段),对岩芯的岩性、沉积物粒度参数、频率分布曲线、概率累计曲线以及分选系数-中值粒径(σ_i-d(0.5))图和C-M图进行分析,结合已有文献资料和测年数据,研究表明:阶段A以粉砂和砂为主,分选中等以上占96%,概率累计曲线为三段式,以推移和跃移搬运为主,包含递变悬浮和均匀悬浮两个区域,水动力强度中等,属浅海环境;阶段B以砂为主,分选中等以上占96%,分选好的比例有所增加,概率累计曲线为三段式,以推移和跃移搬运为主,包含悬浮和滚动区、递变悬浮区,水动力强度中等,也属浅海环境;阶段C以粉砂和砂为主,分选中等以上比例超过86%,概率累计曲线为四段式,以推移和跃移组分为主,存在悬浮和滚动区、递变悬浮区、均匀悬浮区,该段沉积环境和水动力条件复杂,属于滨海环境;阶段D以砂为主,分选中等以上占95%,概率累计曲线为三段式,以推移和跃移组分为主,包含递变悬浮区和均匀悬浮区,水动力减弱,属受海洋作用控制的海湾环境;阶段E以粉砂为主,分选极好比例超过85%,概率累计曲线为三段式,以推移和跃移搬运为主,属均匀悬浮区,沉积水动力最弱,该段为粒径向上变细的潮坪环境。
The core of BF10 in Rudong County, north of Yangtze River Delta, is divided into five phases (A, B, C, D and E) from bottom to top. The core lithology, sediment grain size, histogram, cumulative probability curves and sorting coefficient - a median diameter (σ_i-d (0.5)) and CM FIG FIGS analysis, combined with the existing literature and dating data, studies show that: in stage A and silt The sand is the main type, 96% of which are medium or above, and the cumulative probability curve is of three-segment type. The main part of the probability-cumulative curve is the transitional and transitional moving, including the two areas of graded and uniform suspension with moderate hydrodynamic strength and a shallow marine environment. B is dominated by sand, 96% of which are medium and above, and the percentage of sorted is increased. The cumulative probability curve is of three-segment type, with the transition and the transition moving mainly including the levitation and rolling zones, , Medium hydrodynamic strength, also belong to the shallow sea environment; Stage C is mainly silt and sand, more than 86% of the middle and above, the cumulative probability curve for the four-stage, with the transition and the main component of the transition, the presence of suspended And rolling area, changing the suspension area, uniform suspension area, the depositional environment and hydrodynamic conditions of the complex, belonging to the coastal environment; stage D to sand-based 95% above average, and the cumulative probability curve is three-stage, dominated by the components of the transition and the jump, including the transitional and uniform floating regions, the weakened hydrodynamic forces and the Gulf environment controlled by the ocean. Stage E Silt-based, excellent sorting ratio of more than 85%, the probability of cumulative curve for the three-stage, with the transition and the main transition handling, is a uniform suspension area, the weakest hydrodynamic sediment, the section of the particle diameter upward thinning Tidal flat environment.