银额盆地查干断陷闭流湖盆层序类型与层序地层模式

目前,对断陷畅流湖盆的层序地层模式研究较多,而针对断陷闭流湖盆的层序地层模式研究较少。以查干早白垩世断陷闭流湖盆为例,分析了断陷闭流湖盆的沉积特征和演化规律,总结了断陷闭流湖盆的层序类型及特征,提出了断陷气候复合型和气候型层序类型,归纳了不同演化阶段的层序地层模式。认为查干断陷闭流湖盆沉积演化经历了断初、断陷和断坳等3个阶段,断初和断陷阶段的层序地层模式是一种由断陷气候复合型层序组成的层序地层模式,断坳阶段的层序地层模式是由气候型层序组成的层序地层模式。

SEQUNCE TYPES AND SEQUNCE STRATIGRAPHIC MODELS OF CHAGAN FAULT-DEPRESSED STAGNANT LACUSTRINE DEPRESSION, YIN-E BASIN

A research field of lacustrine sequence stratigraphy is to establish the sequence stratigraphic models for different geological setting in different lacustrine basins. Most researches concentrate on the sequence stratigraphic models of fault|depressed flowing lacustrine basins, but less researches are on fault|depressed stagnant lacustrine basins. In this paper, taking the Early Cretaceous fault|de pressed stagnant lacustrine basin on Chagan depression as an example, sedimentary characteristics and evolution were analyzed; the sequence stratigraphic models and characteristics of different types of sequences were summarized; the two types of sequence (the climate type, and the compound type of fault|depression & climate) were put forward; and the sequence stratigraphic models of different sedimentary evolution phases were concluded. Elaborate research indicates that the sedimentary evolution of the Chagan fault|depressed stagnant lacustrine basin have three evolution phases: the early stage of fault|depression, themain fault|depressed stage and the depressed with faulted stage. The sequence stratigraphic models in the early stage of fault|depression and the main fault|depressed stage were made of the compound type of fault|depression & climate and those in the depressed with faulted stage were made of the type of climate.