苏北辐射沙洲沿岸有孔虫埋葬群特征及其与环境的关系

FORAMINIFERAL TAPHOCOENOSES IN THE COASTAL AREA OF NORTH JIANGSU BANKS AND THEIR RELATIONS WITH ENVIRONMENT

经３４个表层沉积物样品的有孔虫定量分析，表明苏北辐射沙洲沿岸潮滩的有孔虫为混合埋葬群，由原地生活分子和外海的异地分子混合而成。其特点是分异度偏高，丰度变化大，壳径偏小，壳体机械破坏较明显，富含壳径细小的浮游有孔虫。这些特点反映出埋葬群在形成过程中辐射沙洲区强大潮流的搬运作用，在搬运、沉积和埋葬过程中有孔虫壳体经受机械分选和破坏作用。埋葬群与生态环境因素和埋葬环境因素均有密切关系。

Collected from the coastal area (tidal flat) of the North Jiangsu Banks (NOJIB) on the inner shelf of the Southwestern Yellow Sea,34 surface sediment samples were quantitatively analysed. The results show that the foraminiferal taphocoenoses are mixtures of indigenous and allochthonous compositions.These taphocoenoses are high in diversity,strongly variable in abundance,small in test size,rich in planktonic forms and common in mechanical destruction (test abrasion and brokenness).All these features are related to the tidal transport processes which are the dominant hydrodynamic conditions in the study area.During the transportation and deposition,the foraminiferas are well sorted,mixed and destructed.Therefore,these foraminiferal taphocoenoses studied are combined products of ecological and taphonomic factors.