古沙漠沉积及其层序单元——以鄂尔多斯白垩纪内陆古沙漠盆地为例

PALAEO-DESERT DEPOSITION AND SEQUENCE STRATIGRAPHIC UNITS: AN EXAMPLE FROM CRETACEOUS CONTINENTAL PALAEO DESERT BASIN IN ORDOS

古沙漠是以风成沉积为特征的一种特殊环境的充填 ,由于风成沉积与水成沉积机制不同 ,目前以湖泛面为依据所开展的陆相湖盆层序地层研究的原则不能完全适用于古沙漠地层 .分析讨论了基于地下潜水面为沉积基准面的古沙漠沉积作用过程及其控制因素 ,探讨了古沙漠层序地层的构成及其单元的划分 ,并提出了古沙漠成因地层及沉积学研究的有关概念和方法 .

The palaeo desert is a special aeolian depositional system. Because of the difference in mechanism between the aeolian and the hydatogenous depositions, the principle presently applied to the sequence stratigraphic research into the continental lacustrine basins in line with the lake flooding surface, is not perfectly appropriate for the research into the palaeo desert strata. This paper is focused on the palaeo desert depositional process and controlling factors with the underground water surface as the depositional base level. In addition, this paper also deals with the construction and unit classification of the palaeo desert sequence stratigraphy, and introduces concepts and methods for the research into the palaeo desert genetic strata and sedimentology.