【摘要】 南海是东亚古季风产物的主要沉积盆地，保存着比陆地更加完整和连续的沉积记录。详细分析了ODP 1143号钻井晚中新世的放射虫化石群，主要根据标志种 Diartus petterssoni，D.hughesi和Stichocorys delmontensis等的分布特征，分别建立了南海南部晚中新世的 RN6，RN7和RN8等3个放射虫化石带，并讨论了其地层年龄。探讨了以地层中放射虫的丰度变化特征等在南海南部作为东亚古夏季风活动替代性指标的可能性，初步说明东亚古夏季风可能早于8．7Ma B．P．出现，约在 8．24Ma B．P．强化达到高峰，认为与印度季风的出现几乎同步或略早。更多还原

【Abstract】 The South China Sea is the major deposit basin of the East Asian paleomon-soon products, and is preserving more integrated and continuous deposit record thanland. This paper detailedly analyzes the radiolarian fossi1s of the Late Miocene on sitel143 of ODP Leg 184. On the basis of the mark species distribution of Diartuspetterssoni, D. hughesi and Stichocorys delmontensis, etc, we establish respectivelythree radiolarian fossi1 zones of the Late Miocene in the southern South China Sea,inclu-ding RN6,RN7 and RN8, and discuss their stratlgraphic age. The trial inquires into theposslbility of using the features of radiolarian abundance and species changes in the stra-ta as proxies of the East Asian summer paleornonsoon activities in the southern SouthChina Sea. The pre1iminary results show that the East Asian summer paleomonsoon pos-sibly appeared earlier than 8. 7Ma B. P. and intenslfied to its summit at about 8. 24 MaB. P.. It is suggested that the emergence of the East Asian summer paleomonsoon wasalmost synchronous with or earlier than the Indian paleomonsoon.更多还原