| 华南二叠纪层序地层与盆地演化 |
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| 引用本文： | 陈洪德,王成善.华南二叠纪层序地层与盆地演化[J].沉积学报,1999,17(4):528-535. |
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| 作者姓名： | 陈洪德 王成善 |
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| 作者单位： | 成都理工学院沉积地质研究所《油气藏地质及开发工程》国家重点实验室 |
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| 基金项目： | 石油天然气公司“九五”重大科技工程项目 |
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| 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。
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| 关 键 词： | 华南 层序地层 盆地分析 非稳定性沉积 |
| 收稿时间： | 1998-11-26 |
Permian Sequence Stratigraphy and Basin Evolution in South of China |
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| CHEN Hong,de,WANG Cheng,shan,LIU Wen,jun,QIN Jian,xiong.Permian Sequence Stratigraphy and Basin Evolution in South of China[J].Acta Sedimentologica Sinica,1999,17(4):528-535. |
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| Authors: | CHEN Hong de WANG Cheng shan LIU Wen jun QIN Jian xiong |
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| Institution: | State Key Laboratory of Oil/Gas Reservoir Geology and Exploitation Institute of Sedimentary Geology,Chengdu University of Technology,Chengdu 610059 |
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| Abstract: | 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 to consuming stage.The basin in the south China comes into holaspid period in Lower Permian.The main proofs are:(a) the transgression field of the sea is the largest in this stage;(b) the deep water area of the extension basin is the largest;(c) there is the strongest basic volcanic activity of Hercynian Indo during Dongwu movement stage,and it cause this area to be protruded and disintergrated,the transgression field of the sea shortened and finally the property of some basin changed.The basic characteristics of the Permian basin are that a northwest extension basin is between two large cratons Yangzi and Huaxia and the development of the two cratons are not balanced.The central tension basin is formed by rifting again along Caledonian junction belt.This palaogeography framework is very similar to that of Caledonian.Therefore,we consider that the tectonic environment of Upper Palaeozoic era basin in the south China is not a stable craton environment. |
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| Keywords: | South China sequence stratigraphy basin analysis unstable sedimentation |
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