FORMATION AND EVOLUTION OF THE BAYANHAOTE PROTOTYPE BASINS

The Bayanhaote Basin is an important basin to which the exploration of hydrocarbon is strengthened in recent years.It is located in the juncture of three tectonic units,that is,the Alashan Massif,the Ordos Massif and the Hexi Corridor in termediate zone.It is a compound and superimposed basin formed from different periods and many times of tectonic movement reformation.Its formation is closely related to the specific geotectonic location it lies.Starting with regional tectonic characteristics,the prototypes of the Bayanhaote Basin and their evolutionary characteristics in differnt geological historical periods are analysed and summarized thoroughly.The authors considered that the Bayanhaote Basin and its peripheral regions experienced the evolutionary stages of the Early-Middle Proterozoic Qin-Qi-He Trigeminal Rift,the Late Proterozoic-Cambrian Ordovician Aulacogen,the Silurian Devonian Foreland Basin,the Carboniferous-Permian Compound Basin and the Mesozoic-Cenozoic Fault Basin.