摘要
二叠纪湘中南区出现了明显的沉积相分异。相分异受多种因素控制:古陆和水下古隆起的存在影响了原始基底地形和陆源碎屑的分布,从而导致了沉积差异;沉积物厚度和性质的差异形成同沉积断层;沉积作用和构造作用的综合导致沉积基底的地势差异;沉积基底的地势差异和同沉积断层又进一步产生沉积物性质和厚度的分异;而这一切又和盆地的演化密切相关。沉积相分异是伴随盆地的演化发生的,其实质是克拉通内盆地演化与造山过程间的耦合关系。
An obviously sedimentary facies differentiation occurred during Permian in central-southern Hunan, which might be controlled by many factors, such as the old lands and submerged uplifts, thickness and property of sediments, synsedimentary faulting, relief of the sedimentary floor and basin evolution. The existence of old lands and submerged uplifts constrained the original relief of the sedimentary floor and the distribution of terrigenous sediments. The difference of thickness and property of sediments caused to form the synsedimentary faults in the process of sedimentary compaction. Both of sedimentation and tectogenesis resulted in the relief differentiation. The relief differentiation and synsedimentary faults, in turn, controlled the sedimentation and caused the facies differentiation. All of the factors mentioned above related closely to the basin evolution. The filling of the terrigenous materials to the basin decreased the relief differentiation and eliminated gradually the sedimentary facies differentiation. During the Changxing period of Late Permian, the whole area of central-southern Hunan became a compression basin. The developing of the facies differentiation was accompanied by the process of basin evolution, namely, the cratonic basin developing might be, actually, coupled with the neighboring ocean evolution and orogenic process.
出处
《地质科学》
CAS
CSCD
北大核心
2005年第4期510-517,共8页
Chinese Journal of Geology(Scientia Geologica Sinica)
基金
国家自然科学基金(批准号:40372062)资助项目成果。
关键词
沉积相分异
盆地演化
二叠纪
湘中-南地区
Sedimentary facies differentiation, Basin evolution, Permian, Centralsouthern Hunan
