中—晚奥陶世期间 ,鄂尔多斯南部地区为古秦岭洋北侧具沟、弧、盆体系的主动大陆边缘。在此背景下 ,有序地发育了可分别用镶边碳酸盐陆棚模式及重力流模式概括的弧后盆地与残留海盆地沉积类型 ;构造轮廓为向洋呈阶状断落和块状错移结构特征的基本格局。晚奥陶世末 ,华北板块与扬子板块的陆 -陆碰撞作用结束了主动大陆边缘构造阶段 During the Middle-Late Ordovician period, the southern part of Ordos is the active continental margin of the ditch, arc and basin system in the northern part of the ancient Qinling Ocean. Under this background, the sedimentary types of back-arc basins and residual sea basins that can be summarized by the striped carbonate shelf model and the gravity flow model are developed in an orderly manner. Move the basic features of the structure. Late Ordovician end, the North China plate and the Yangtze plate continental land-continental collision ended the active continental margin tectonic stage