阿拉伯半岛中南部上前寒武系至自垩系地层分布及特征

The Upper Precambrian to Cretaceous of Central and Southern Arabian Peninsula

阿拉伯半岛中部和南部结晶基底之上最早的稳定沉积是前寒武纪晚期至早寒武世的断陷盆地沉积,以碳酸岩、碎屑岩和蒸发岩为特征。寒武系至下二叠统地层由陆源碎屑岩及少量碳酸岩组成。晚二叠世开始广泛海侵。以浅海灰岩为主,沉积范围向南扩展。三叠纪晚期至侏罗纪初期地壳上升剥蚀。侏罗系和白垩系地层以浅海碳酸岩为主,其间晚白垩世土伦期再次受到地壳运动影响。

In centraI and southern Arabia the first sediments overlying crystalline basement were the Late Precambrian to Earlp Cambrian carbonates,clastic and evaporites,which followed by the latest Early Cambrian through Early Permian sandstones and shales.During the Late Permian,a extensive transgression occured so that the Paleozoic sequence was capped by neritic carbonates with shale intercalations.Towards the south the sedimentary scope extended and the carbonates were pro-gressively replaced,first by shales,then by sandstones.The latest Triassic to the earliest Jurassic was a period of uplift.Movement let to erosion of sediments of this age.The Jurassic and Cretaceous sequences were mainly characterized by neritic Cabonates.But the disconformity developed between the sequences of Cret-aceous suggests that the region was again subjected to tectonic activity.