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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。
Since the Late Quaternary transgression in Yinggehai-Qiongdongnan Basin, three second-level sequences and 13 third-level sequences can be divided into two sequences. The sequences of fossils (mainly planktonic foraminifera) The interface age values from top to bottom are respectively 1. 9Ma, 2 .2Ma, 2 .8Ma, 3 .4Ma, 5.1Ma, 6.0Ma, 0.2Ma, 1 2.6Ma, 1 5.2Ma, 1 9.6Ma, 21.0 Ma, 23.7Ma, 2 5.5Ma, 30 Ma. Through the evolution of the environment during the sedimentary period of each sequence, the periodicity of the sea level change is discussed and compared with the contemporaneous global sea level cycles. The highest sea-level period in this area is the Early Pliocene, which is equivalent to the N1 9 zone of planktonic foraminifera to the lower part of N2 1 zone, followed by the early Middle Miocene, equivalent to planktonic foraminifera N9 to N1 2 zone.