Characteristics of Later Different Reformation and its Significance in Occurrence of Multi-Energy Deposits in Ordos Basin

Ordos Basin, rich in multi-energy resources of oil, gas and uranium, is a depression basin within the Late Triassic-to-early Cretaceous craton, which overlapps on the Paleozoic craton basin. The basin started its later reformation in the Late Cretaceous, which is of significant importance to energy deposits. Few studies have, however, been focused on ages of the reformation and its characteristics. Based on the analysis of the regional geological settings and Cenozoic sedimentary structures, combined with published and newly developed fission track ages, the reformation was divided into five stages with various characters, including 1) regional uniform uplift stage (Late Cretaceous to Paleocene); 2) different uplift and subsidence stage (Eocene to Oligocene); 3) different uplift stage of the east and west of the basin (Early-Middle Miocene); 4) structural reverses of the east and west of the basin (Late-Miocene to Pliocene); and 5) the formation of loessial plateau and the development of the Yellow River ...