【摘要】 鄂尔多斯盆地的早奥陶世沉积可划分为西缘末端变陡的碳酸盐岩缓坡、东缘蒸发-局限台地和南缘镶边碳酸盐岩台地3个沉积区。岩相古地理的发展可划分为3个阶段,即冶理—亮甲山期为稳定的发展阶段,早、晚马家沟期为岩相分异阶段,峰峰期为中奥陶世陆源浊积盆地这一新的发展阶段的前奏。其演化具有东升西降的特点,东部沉积区的沉积相演化为一个向上变浅的沉积序列,而西部为一个向上变深的沉积序列。更多还原

【Abstract】 Ordos Basin located at the western margin of Huabei plateform in the early Paleozoic. In this area, depositional environment could be divided into three different divisions during Early Ordovician: a distally steepened carbobnate ramp in western depositional division ;an accretional rimmed carbonate platform in southern depositional division and a evaporite-restricted platform in eastern depositional division. In the evolution of the lithofacies and paleogeography of lower Ordovician in Ordos Basin three stages can be recognized: (1) stable stage (Yeli-Liangjiashan epoch); (2) differentiation stage(early-late Majiagou epoch); (3) early episode of the evolution of deepwater basin with clastic turbidite in Middle Ordovician (Fengfeng epoch). The structural development of the basin is characteried by uplifting in eastern division and descending in western division (upward shallowing sequence in the eastern division, upward deepening sequence in the western division).更多还原