民和盆地南缘盐锅峡组的建立及其地质意义

详细信息

The construction and significance of the Yanguoxia Formation on the southern margin of the Minhe Basin,Gansu

摘要: 民和盆地下白垩统地层出露广泛,在其中部有一整套以水下沉积构造和其中特有的蓝灰色标志层为主体的细碎屑岩系,与上、下地层有着极大差异,命名为"盐锅峡组"。该组地层剖面连续,出露甚好,顶底清楚,具独特的岩性、岩相特征。该组岩石地层单位的正式建立,不但便于区内地层划分与对比的需要,而且对盆内层序地层、构造演化、作用相分析都具重要作用。
- 区域地层 /
- 划分与对比 /
- 下白垩统 /
- 盐锅峡组
Abstract: The well exposed Lower Cretaceous strata constitute a megacycle consisting of a succession of coarse-to fine-grained sediments in the Minhe Basin,Cansu.The Yanguoxia Formation is right located in the middle part of the megacycle.Vertically,the formation which is quite different from the overlying and underlying strata is dominated by the littoral and shallow lacustrine fine-grained clastic rock series and marked by subaqueous sedimentary structures and bluish grey marker beds which are represented by three maximum flooding surfaces.In this respect,the formation may have important geological significance in regional stratigraphic division and tectonic synthesis although laterally the lithology and lithofacies are inextensive and highly variable.
- regional stratigraphy /
- division and correlation /
- Lower Cretaceous /
- Yanguoxia Formation