黔桂地区泥盆纪层序地层和台内裂陷槽的形成演化

Devonian Sequence Stratigrapny and Formation and Evolution of Intraplatform Rift Trough in the Guangxi and Guizhou Area,China

黔桂地区是泥盆纪时期南华海盆内裂陷活动作用初始且十分显著的地区。本文结合区域构造和盆地格局分析，通过典型剖面研究，将黔桂稳定型滨岸一台地相区的泥盆系划分为２１个３级海平面变化控制的层序。根据南丹罗富、大厂裂陷槽盆地泥盆系层序地层研究和与相邻稳定型泥盆系层序地层对比及层序地层格架分析，揭示了裂陷槽盆地的形成演化过程。指出构造幕式沉降是裂陷槽盆地层序发育和层序构成的主控因素。

Guangxi and Guizhou in South Ghina are one of the famous Devonian distribution areas interested by both Chinese and foreign geologists.By classification and correlation of sequence stratigraphy of more than 10 sections in Guizhou and Guangxi.21 sequences and T-R cycles were identified to correspond to third-order sea-level changes.On the basis of the division, correlation and study of the framework of sequences in the stable regions and rift trough in the Luofu, Dachang sections, Nandan County,the formation and evolution of the rift trough .Episodic tectono-setting mainly controlled the development and architectures of sequences in the rift trough were discussed. Episodic tectono-sequences recorded the depositional response to the episodic tectono-setting of the rift trongh.