江苏中南部潮滩有孔虫特征及其与环境的关系

江苏中南部沿岸潮滩现代表层沉积物样品的定量分析结果表明其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。

Foraminifera in tidal flats along Jiangsu middle-south coast and their relations with environment

Modern surface sediment samples collected from the tidal flats of the Jiangau middle-south coast were quantitatively analysed. The results show the foraminiferal taphocoenoses are mixed from the indigenous with allochthonous compositions. The features of the taphoconoses 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 tidal transport processes which are the dominant hydrodynam- ic conditions in the study area. During the transport, deposition processes, foraminiferal tests are well sorted, mixed and destructed. Therefore, the foraminiferal taphocoenoses in the study area are the combined product of ecological and taphonomic factors of the environment.