Analysis of Sequence Stratigraphy in the Fractured Continental Margin, Late Maok ouian, Early Permian, Central Guizhou Province
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摘要: 黔中早二叠世晚期发育变异多姿的硅质岩-碳酸盐岩和火山岩,笔者通过大地构造学、火山岩岩石学和岩石地球化学、层序地层学的综合分析认为,与一般的被动大陆边缘不同,该区这种断裂大陆边缘的层序地层特征主要依据纵向上反映海平面变化的岩性突变来识别,而岩性突变又是构造变动的反映。据此,将该区茅口组二段划分为一个准层序组和两个准层序,每个准层序以突变最大海泛面为基础,包含了凝缩层和加积高位体系域;横向上解释为破裂碳酸盐台地型层序地层格架,即把构造作用与层序地层格架的形成以及沉积体系的分异统一起来,提出了断裂陆缘层序层分析的实例。Abstract: Silliceous rocks, carbonate rocks and volcanic rocks are widespread in the upper Maokou formationof Early Perenan in the centry part of Guizhou Province. Based on the synthetic analysis of tectorrics,petrology geocchemistry and sequence stratigraphy,the tectonic setting is supposed to be fault-con-trololed continental margin. Under the condition of this tectonic setting, the characteristics of sequencestratigraphy is different from those of passive continental margins and foreland basins aswell as from theother tectonic unit. The sequencoe bounding surface of the fault ontrol ed continental margin can bedlis-tinguished by the sudden lithologic mange, which implies tectonic changes. The tiferal differentiation ofthe depositional system tract in each sequence has a relationship with the strength of upper crustult caused by deep magmatism. Based on the basic characteristics of tectonics and sedimentology,the secondmember of the Maokou formation could be clasisfied into one parasequence group with two parase-quences, and each of them takes the amfs as its base, including condensed section and progradationalhighstand system tract; it is explained as a sequence stratigraphic architecture of the broken carbonateplatform w hich can be further divided into remnant platform, prograd ational isolated platform,platfo rmtrough of fault trough and ramp facies, etc·The example of the sepuence stratigraphic analysis on thefault ontrolled continental margin is raised by combining tectonism,of sedimentary sysyten together.the formation of sequence stratigraphic architecture and the variation.
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[1] 1 Breu C, Goodman U' M and Loduca S T. Sequence, cycle, andbasin dynamics in the Silurian of the Appalachian ForelandBasin Geology sedimentary, 1990, 69(3-4): 191-244.
2 赵锡奎.黔中早二叠世晚期织金拉张盆地原型分析.石油与天然气地质.1991, 12 ( 3): 308- 321.
3 梅冥相.碳酸盐台地的地层层序格架及旋回地层级次.岩相古地理.1992, ( 2): 44- 50.
4 罗志立.金以钟.赵锡奎等.试论上扬子地台的峨眉地裂运动.地质论评.1988, 34 (1): 11-23.
5 CK威尔格斯等编.徐怀人等译.层序地层学原理.石油工业出版社,1993, 1-185. -

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