银额盆地查干断陷闭流湖盆层序的控制因素与形成机理

陆相层序的控制因素与形成机制是陆相层序地层学研究的一项重要内容。断陷闭流湖盆作为一种独特的类型有其自身的特点。对查干凹陷早白垩世断陷闭流湖盆的沉积演化和基准面相对变化曲线的研究表明查干凹陷断陷闭流湖盆层序的控制因素以构造控制因素与气候因素占主导地位,其次是沉积物供应速率和湖平面的变化;在造控制因素与气候因素的双重控制下形成两类层序,一类是断陷气候复合型层序,另一类为气候型层序。

Controls and Formation Mechanism of the Sequences in the Chagan Fault-Depressed Stagnant Lacustrine Depression, Yin-E Basin

The controlling factors and formation mechanism of the continental sequences are important research field in continental sequence stratigraphy. A fault-depressed stagnant lacustrine basin as a unique basin has its own particular characteristics. In this paper, the author has studied the sedimentary evolution and the base-level changes of the Early Cretaceous fault-depressed stagnant lacustrine basin in Chagan Depression, and then considered that the controlling factors of the sequence in the fault-depressed stagnant lacustrine basin are dominantly the integration of tectonic and climatic factors, and, in the next place, the supply rate of the sediments and lake-level change. Under the control of the double factors, two types of sequences were formed: one was the compound type of fault-depression and climate, and another was climatic type.