摘要
新兴的层序地层学,是盆地分析的重要手段。华南二叠纪是华南板块海西—印支阶段盆地演化的重要时期,沉积盆地类型划分为克拉通盆地、板内及板缘伸展盆地,以及东吴运动后出现的前陆盆地和弧后盆地。南方二叠系由11个层序和1个半超层序组成,不同类型沉积盆地中层序地层具有不同的层序特征和充填形式。二叠纪是海西—印支期盆地演化由成熟到消亡的转折阶段,它们发育于扩张环境下,总体上是由两个克拉通盆地夹持一个伸展盆地。两个克拉通盆地的发展不均衡,中央伸展盆地沿着加里东的拼合带发育。这一古地理古构造格局与加里东期十分相似,由此认为,华南晚古生代沉积的构造背景,并不是稳定的克拉通环境。
Sequence stratigraphy is an important method of basin analysis.Permian is an important evolution stage of Hercynian-Indo-Chinese Basin in the South China.The tectonic environment of the basin is under an extensional condition as a whole and the sedimentary basin can be divided into two classes including craton basin and extension rift basin.After the Dongwu movement,there exist squeezing foreland basin and arc rear basin due to partial basin environment changes.There are special characteristics in sequence stratigraphy of different sedimentary basin because the structural site sedimentation rate and geometry are different and they influence and control the sea level change.Permian system in the south China consists of eleven sequences corresponding to 3rd order cvcle and two supersequences corresponding to 2nd order cycle.Supersequence of Lower Permian is a complete cycle.Qixia epoch is composed of three sequences (S1-S3) corresponding to sea level rising stage of 2nd order cycle,Maokou epoch also consists of three sequences (S4-S6) corresponding to sea level descending period.The largest transgression period is in Lower Maokou epoch.The supersequence of Upper Permian is not complete only corresponding to a sea level rising period of 2nd order cycle The characteristics of sequences or supersequences are different not only in material constitution and geometry ,but also in structure,composition and the boundary surface form,and it demonstrates that the types,evolution and characters of the basin have tightly inherent relationship. According to tectonic role,sedimentary characteristics,sea level change,sequence stratigraphy texture and paleogeography,the evolution of Hercynian Indo Chinese sedimentary basin in the south China can be divided into five stages and respectively corresponding to five 2nd order sea level change cycles.It indicates a process from the basin forming,developing to consuming with clear rhythm.The evolution of Permian sedimentary basin is in the transition process from mature stage
出处
《沉积学报》
CAS
CSCD
北大核心
1999年第4期529-535,共7页
Acta Sedimentologica Sinica
基金
石油天然气公司"九五"重大科技工程项目
关键词
层序地层
盆地
非稳定性沉积
二叠纪
华南地区
South China sequence stratigraphy basin analysis unstable sedimentation
