Abstract:

Based on the cosine transform method, and using the method of upward continuation and computed base depth of the basin using the inverse technique of even (density) and single interface, the authors had processed the Hulin basin Bouguer gravity anomalies and inversed the base depth. At the same time, by analyzing integrated interpretation results of gravity and magnetotelluric sounding profile in Hulin basin and neighbouring geologic information in Russia, We studied differences of underlying structure between south and north of the basin reflected by geology and geophysics, and redistricted its structural units. It is shown that the south fracture of Dunmi fault, which was composed of two faults, is vertical and strike-slip fault, it controls strike-slip movement of its bilateral fault block and the formation and evolution of the basin. If let Dunmi south fault as dividing line, the Hulin basin can be divided into two basins, i.e. south basin and north basin, and their geology and geophysics properties are totally different. The north basin is part of large Sanjiang basin, whereas the south basin is an independent basin system.

Key words: Hulin basin, gravity anomaly, structure unit, Dunmi south fault, strike-slip fault, geology, geophysics