砂质沙漠(风成砂海)迁移的沉积记录,由理想化的三段砂海相序构进。底海段为前砂质沙漠(fofe—erg,赋存于侧向沉织环境内的风砂体系组成。这些砂体有小型沙丘复合体,锯齿状沙洲(zibars)和沙席形成的风成地层。前砂质沙漠位于砂质沙漠的下风向,即砂质沙漠的前缘,是初始风成沉积作用的产物。与砂质沙漠迁移相关的盆地沉降,使前砂质沙漠之上又发育了称做中中砂质沙漠中段(fore—erg)它以巨厚的,大规模的交错层砂岩为代表,是大型臂形沙丘复合体。在中砂质沙漠内。风对区域沉积作用模式的影响最大,在砂质沙漠中搬运和沉积的砂大部分集中于该区。砂供给减少和砂质沙漠的连续迁移,将在中砂质沙漠之上形成一薄层后砂质沙漠(back—erg)。后砂质沙漠相序上段,与前砂质沙漠区非常相似,存在相以类型的风成地层,并以砂体形式赋存于上风侧向沉积环境的沉议物内。由于风对沉积作用的影响有限。或砂质沙漠迁移的不完全,后砂质沙漠沉积是薄型,或因易受沉积后的侵蚀作用,而可能移失殆尽。构造:气候和海平面升降均对砂质沙漠沉积有影响,将使理想化的砂质沙漠相序发生不同的变化或改变。下边以北美西部、欧州、非州南部和南美的古代实例为例,来说明砂质沙漠迁移沉积记录的变化 Sedimentary records of the sandy desert (Aeolian Sand Sea) migrate and are composed of an idealized three-stage sand-sea facies sequence. The bottom section of the sea is the fofe-erg, a system of sand bodies that occur in a lateral submerged environment consisting of small sand dune complexes, serrated zibars and aeolian formations The former sandy desert is located in the downwind direction of the sandy desert, the front of the sandy desert, and is the product of the initial aeolian sedimentation, and the subsidence of the basin associated with the desertification of the sandy desert has developed Known as the fore-erg mid-sandy sandy foreland (fore-erg) It is a large, large-scale cross-layered sandstone, is a large arm sand dune complex in the mid-sandy desert, the wind on the regional sedimentary model Most of the sand transported and deposited in sandy deserts is concentrated in the area, and the reduction of sand supply and the continuous migration of sandy deserts will form a thin layer of back-sand over the mid-sandy deserts, erg). The upper facies of the late sandy desert is very similar to the former sandy desert area, with the presence of facies-type aeolian strata and the presence of sand bodies in the laterally precipitated sediments. The impact on sedimentation is limited, or the incomplete migration of sandy desert, Sandy desert deposits are thin or may be depleted due to their susceptibility to post-depositional erosion Tectonic: Both climatic and sea-level rise and fall have an impact on the sedimentation of the sandy desert and will result in a phase sequence of the idealized sandy desert Different changes or changes occur in the following examples of ancient deserts in western North America, Europe, southern Africa, and South America as an example