鄂尔多斯盆地晚古生代古构造*

鄂尔多斯盆地晚古生代基底继承了奥陶纪中部高、东部和西部低及西陡东缓的古构造面貌。利用大量钻井分层数据，绘制了晚古生代各个时期残存地层厚度图，其空间变化反映了鄂尔多斯盆地晚古生代古构造格局特征。结合东西向及南北向地层厚度对比、演化剖面的研究，认为晚古生代鄂尔多斯盆地的沉积在本溪期—太原期主要受中央古隆起的控制，地层空间展布东西分带明显；山西期中央古隆起对沉积作用的控制不是很明显，地层从东西分异逐渐过渡到南北分异，这种沉积格局的转变与古地理演化具有一致性，从而说明了古构造对沉积的控制作用。

Palaeotectonics of the Late Paleozoic in Ordos Basin

The basement of the Ordos Basin in the Late Paleozoic inherited the Ordovician palaeotectonics，which was higher in the center and lower in the west and the east，and steep in the west and gentle in the east.Based on a large number of stratigraphic division of drilling wells，the remnant strata thickness maps of each period in the Paleozoic were complied，and its spatial changes reflected the palaeotectonics of the Ordos Basin.Combining the EW and SN comparison profiles of the stratigraphic thickness and the evolutionary profile in the Ordos Basin，the analyses indicate that the deposition of the Benxi-Taiyuan Periods in Late Paleozoic is mainly controlled by the Central Paleouplift，with obvious difference between the east and the west in strata spatial distribution.Until the depositional period of Shanxi Formation，the role of Central Paleouplift turned gradually less important.Differentiation between east and west gradually transfered into differentiation between north and south in stratigraphic distribution，the change in depositional pattern is consistent with the palaeogeographic evolution，showing that the deposition is controlled by palaeotectonics.