| 安徽中南部震旦纪-三叠纪二级层序的划分 |
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| 引用本文： | 杜森官.安徽中南部震旦纪-三叠纪二级层序的划分[J].安徽地质,1999(1). |
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| 作者姓名： | 杜森官 |
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| 作者单位： | 安徽地质调查院!合肥２３０００１ |
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| 摘 要： | 安徽中南部震旦纪至三叠纪各时期为陆源碎屑沉积环境和碳酸盐沉积环境的交替，据沉积盆地内或滨、浅海交接地带沉积相序的变化、相的叠置变化关系，结合关键部位的层序界面和凝缩层特征，将其分为８个二级层序，每一个二级层序在盆地内或滨、浅诲交接部位，在沉积相序上总的趋势均表现为由浅→深→浅的变化，且与海平面变化曲线相吻合。二级层序的界线和凝结层往往是该二级层序内若干个三级层序中海平面下降或上升最为显著的转折部位，这些界面类型往往与构造运动、海平面变化、冰川事件有关。
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| 关 键 词： | 二级层序 海平面变化 震旦一三叠纪 安徽中南部 |
THE DIVISION OF THE SINIAN-TRIASSIC SECOND-ORDER SEQUENCES IN THE MIDDLE-SOUTH OF ANHUI |
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| Du senguan.THE DIVISION OF THE SINIAN-TRIASSIC SECOND-ORDER SEQUENCES IN THE MIDDLE-SOUTH OF ANHUI[J].Geology of Anhui,1999(1). |
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| Authors: | Du senguan |
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| Institution: | Anhui Academy of Geological Survey Hefei 230001 |
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| Abstract: | The middle- south of Anhui was in the transitional environment from terrestrial clastic sedimentary environment to carbonatesedimentary environment from the Sinian to Triassic. Eight second-order stratigraphic sequences are determined based on the changes of depositional facies succession in the inner sedimentary basin or the joint zone of littoral and neritic facies with the characteristics of stratigraphic sequence interface and condensed section at key places being taken into consideration. Each second-order sequence shows a general trend of change in facies succession from shallow to deep and back to shallow at the places of inner basin or joint zone of littoral and neritic facies, coincided with the curve of sea-level fluctuation. The interfaces of second-order sequence and condensed section are always the most evident up-or-down transitional places of sea level of several third-order sequence in the second-order ones. And the interfacetypes tend to be concerned with tectonic movement, sea -level fluctuation and glacial events. |
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| Keywords: | second-order sequence sea-level fluctuation Sinian-Triassic middle-south of Anhui |
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