风成沙丘间沉积成因类型与风成垂向层序--以鄂尔多斯早白垩世内陆古沙漠为例

依据鄂尔多斯早白垩世内陆古沙漠沉积实例,探讨了沙丘间的成因分类,按照沙丘间底床的表面环境,将沙丘间划分为干旱型、潮湿型和覆水型三种沉积类型,并阐明了其沉积和组合特征;在此基础上,提出了风成垂向层序模式;鉴于沙漠同一相带的沙丘间类型及其沉积组合具有一定的共性特征,进一步建立和阐明了古沙漠分带的风成层序样式.

INTERDUNE SEDIMENTARY GENETIC TYPES AND AEOLIAN VERTICAL SEQUENCE∶AN EXAMPLE FROM EARLY CRETACEOUS CONTINENTAL PALEODESERT OF ORDOS

Interdune is one of the most changeful desert aeolian depositional sub-environments.Based on the Early Cretaceous continental palaeodesert deposition in Ordos basin,the paper discusses the genetic classification of an interdune,which consists of aridity,humidity and underwater depositional types according to its basement superficial environment.The paper also studies the depositional characteristics and combination relations of the interdune and establishes the aeolian vertical sequence model.At last,it analyses of the aeolian sequence patterns of different depositional zones in palaeodesert environments,based on the comparability of the interdune types and its depositional combination relations in the similar depositional zone.