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。
The well exposed Lower Cretaceous strata constitute a megacycle consisting of a succession of coarse to fine grained sediments in the Minhe Basin, Gansu. 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.
关键词
区域地层
下白垩统
盐锅峡组
民和盆地
地层划分
regional stratigraphy
division and correlation
Lower Cretaceous
Yanguoxia Formation
