摘要
莺歌海—琼东南盆地自晚第三纪海侵以来 ,可划分出 3个二级层序和 1 3个三级层序 ,利用生物化石 (主要为浮游有孔虫 )基准面确定层序的界面年龄值 ,自上而下分别为 1 .9Ma、2 .2Ma、 2 .8Ma、 3 .4 Ma、 5.1 Ma、 6.0 Ma、 1 0 .2 Ma、 1 2 .6Ma、 1 5.2 Ma、 1 9.6Ma、 2 1 .0 Ma、2 3 .7Ma、 2 5.5Ma、 3 0 Ma。通过各层序沉积期的环境演变 ,探讨了海平面变化的周期性 ,并与同时代的全球海平面旋回作了对比。本区最高海平面时期为早上新世 ,即相当于浮游有孔虫N1 9带至 N2 1 带下部 ,其次为中中新世早期 ,相当于浮游有孔虫 N9至 N1 2 带。
Thirteen depositional sequences are presented based on the analyses of well logs and seismic data in Late Tertiary in Yinggehai Qiongdongnan basin, the northern part of South China Sea.The ages of 13 depositional sequence boundaries are dated by bio datum planes (planktonic foraminifera)as 1 9, 2 2, 2 8, 3 4, 5 1, 6 0, 10 2, 12 6, 15 2, 19 6, 21 0, 23 7, 25 5 and 30 0 Ma respectively.The cycles of relative sea level changes are discussed systematically according to the depositional systems and sedimentary facies.The highest stand of sea level developed in Middle and Lower Pliocene,approximately in the interval between the N 19 and the lower part of N 21 planktonic foraminiferal zones. Another high stand of sea level happened in Middle Miocene, roughly from the N 9 to the N 12 planktonic foraminiferal zones.The cycles of relative sea level changes can be correlated with that of Haq et al.(1987).
出处
《现代地质》
CAS
CSCD
北大核心
2000年第3期237-245,共9页
Geoscience
关键词
第三纪
层序地层学
海平面变化
沉积环境
Yinggehai Qiongdongnan basin
Tertiary
sequence stratigraphy
sea level change
depositional system
