Abstract
The depocenters in the Ordos Basin migrated from the Middle-Late Triassic to the Early Cretaceous counterclockwise from south-east to north and subsequently to south-west as shown by an integrated structural study in combination with lithofacies and provenance analyses, and calculations of the thickness distribution of the Mesozoic. No large, but only isolated small accumulation centers existed before the Early Cretaceous. Relatively thick deposits developed mainly near the western basin margin, where the abundant supply of sediment resulted in local accumulation centers. Up to the end of the Middle Jurassic, the area west of the present-day Yellow River was more elevated in the west than in the east. From the Middle-Late Triassic to the Middle Jurassic, the superimposed depocenters reveal how subsidence controlled the locations of the subsidence centers. These centers are located in the south of the Ordos Basin due to flexural subsidence in the foreland, resulting from the contemporaneous strong convergence and orogenic activity of the Qinling Orogenic Belt.
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