南黄海中部沉积岩芯的微体古生物组合特征及古环境演化

本文分析测定南黄海中部两个沉积物柱状样中的有孔虫、介形虫和“C年代，对其微体古生物组合特征、沉积环境和地层年代进行了初步的探讨。有孔虫组合表明研究海域为近岸一浅海环境，其含量从下到上由缺失到出现近岸、浅海有孔虫，反映了沉积环境由陆相到滨岸相、浅海相环境的变迁；孢粉组合反映的古气候也同样经历了针、阔叶混交林一草原，到阔叶林或以阔叶树为主的针、落叶混交林的变化，反映出气候由冷干到暖干的特点。研究结果表明，所研究的柱状样沉积物下部形成于晚更新世晚期，上部属于全新世。

MICROPALEONTOLOGICAL ASSEMBLAGE CHARACTERISTICS OF SEDIMENT CORES FROM THE CENTRE OF THE SOUTHERN YELLOW SEA AND PALAEOENVIRONMENTAL EVOLVEMENT

The foraminifer,ostracod and 14C dating of two sediment cores analyzed and measured in the centre of the southern Yellow Sea, their micropaleontological assemblage characteristics, sedimentary environment and stratigraphic chronology are discussed in this paper. The foraminifer assemblages indicate a nearshore-shallow marine environment, reflecting the change of the sedimentary environment from continental facies to near-shore facies and shallow marine facies; The paleoclimate reflected in the spore-pollen assemblage also equally experienced the needle, broad-leaf mixed forest-grassland, to the broad-leaf forest or to needle, defoliation mixed forest with broad-leaved tree in the main, showing climatic changes form cold dry to warm dry; The results show that the lower part of the core sediments was formed in the Lake Pleistocene stage and the upper part in Holocene.