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《Sedimentary Facies and Palaeogeography》 1997-01
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DYNAMIC SEQUENCE STRATIGRAPHY OF PERIPHERAL FORELAND BASINS

Zhao Yuguang Xu Xiaosong Liu Baojun Chengdu Institute of Geology and Mineral Resources,CAGS  
The general concepts of dynamic sequence stratigraphy are proposed based on the de- tailed studies of sequence stratigrapy of the latest Ladinian(late Middle Triassic)and Car- nian(early Late Triassic)peripheral foreland basins on the western margin of the Upper Yangtze platform.These peripheral foreland basins may be classified into Zones A and B corresponding to those by Posamentier et al.(1993),where there exist distinctive apparent sea-level cycles during a same apparent eustatic period.In Zone A,the rate of subsidence always exceeds the rate of eustatic fall.Consequently,relative sea-level rises continuously during a eustatic cycle,albeit at varying rates.The accommodation spaces are chiefly con- strained by the overthrusting of the peripheral thrust sheets.In Zone B,the rate of eustatic fall periodically exceeds the rate of subsidence,resulting in an interval of relative sea-level fall during a eustatic cycle.It follows that the dynamic sequences in Zone A are made up of the flexural deformation systems tract(FST)and viscoelastic deformation systems tract (VST).The transition from FST to VST reflects the constant increase in the accommoda- tion spaces of the sediments,formation and development of the basin-range transformation systems,and architecture of the dynamic sequence stratigraphy of these transformation systems.The results of research in this paper will assist in the basin-wide basin analysis and allow the rational assessment of the fluid and solid mineral resources.
【Fund】: “八五”国家基础性研究重大关键项目中三级课题“上扬子地台西缘二叠—三叠纪层序地层及海平面变化研究”的部分研究成果
【CateGory Index】: P539.2
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