【摘要】 琼东南盆地是发育于南海西北部的新生代张性断陷盆地。始新统和早渐新统崖城组属过充填型或平衡充填类型,在盆地各个断陷内均具有砂岩-泥岩-砂岩三重沉积充填结构;晚渐新统陵水组在北部坳陷带属过充填及平衡充填类型,发育砂岩-泥岩-砂岩三重沉积充填结构,而在中央坳陷带则属由砂岩-泥岩二重沉积充填结构组成的欠充填型。古近纪盆地的沉积充填结构演化反映了始新世—早渐新世断陷阶段与晚渐新世断拗阶段的盆地演化历史,其中,晚渐新世盆地断拗阶段的发育是南海海底单期扩张过程的结果。更多还原

【Abstract】 Qiongdongnan basin is a Tertiary extensional basin located at the northwest of the South China Sea. From Eocene to early Oligocene, the Qiongdongnan basin was over-infilled or infilled in balance. In almost all the depressions of Qiongdongnan basin, is developed the triple sand-mud-sand sedimentary architecture. During late Oligocene, Lingshui Formation was over-infilled or infilled in balance in the northern depressions with the triple sedimentary architecture of sand-mud-sand. While in the central basin, it was hungry infilled. The sedimentary architecture is characterized by only sand-mud. The Paleogene sedimentary architecture reflected the dynamic history of Qiongdongnan basin during rifting stage from Eocene to early Oligocene and late Oligocene rifting-subsiding stage. The development of Qiongdongnan basin during late Oligocene rifting-subsiding stage is closely related with the seafloor spreading of the South China Sea.更多还原