【摘要】 距现代海岸 2 5km处的渤海湾西北岸宁河县兴坨H1孔 (孔深 2 8.0m)的介形类研究表明 ,可划分为 7个组合层段(自下而上 ) :Ⅰ 纯净小玻璃介组合 ( 2 8.0～ 16 .0m) ;Ⅱ 凹陷中华美花介 东台新单角介组合 ( 16 .0～ 9.0m) ;Ⅲ 东台新单角介 凹陷中华美花介 布氏威契曼介组合 ( 9.0～ 4 .5m) ;Ⅳ 凹陷中华美花介 丰满陈氏介组合 ( 4 .5～ 2 .5m) ;Ⅴ 丰满陈氏介 凹陷中华美花介组合 ( 2 .5～ 1.6m) ;Ⅵ 丰满陈氏介 滨海弯贝介组合 ( 1.6～ 0 .5m) ;Ⅶ 玛纳斯土星介 布氏土星介组合 ( 0 .5～ 0m)。通过对环境分析 ,认为渤海湾西北海岸自全新世以来古环境变化经历了一个完整的海侵序列 ,即自 16 .0m向上至地表 ,从海进到海退为一个完整的沉积旋回。更多还原

【Abstract】 A borehole 28.0 m in depth has been drilled in Xingtuo of Ninghe County in the northwestern coastal area of the Bohai Gulf, 25 km away from the current seashore. Studies show that the Ostracoda can be divided into seven assemblage layers, which are in upward succession: Ⅰ Candoniella albicans assemblage (28.0～16.0 m);Ⅱ Sinocytheridea impressa Neomonoceratina dongtaiensis assemblage (16.0～9.0 m);Ⅲ Neomonoceratina dongtaiensis Sinocytheridea impressa Wichmannella bradyi assemblage (9.0～ 4.5 m);Ⅳ Sinocytheridea impressa Tanella opima assemblage (4.5～2.5 m);Ⅴ Tanella opima Sinocytheridea impressa assemblage (2.5～1.6 m);Ⅵ Tanella opima Loxoconcha binhaiensis assemblage (1.6～0.5 m);Ⅶ Ilocypris manasensis Ilocypris bradyi assemblage (0.5～0 m). Based on an analysis of the environment, the author holds that the palaeoenvironment of the northwestern coastal area of the Bohai Gulf has gone through a complete marine transgression sequence since Holocene, i.e., from -16.0 m to the top, it covers a complete sedimentation cycle of marine transgression and marine ingression.更多还原