Research On The Tectonic Evolution Feature And Origin Mechanism In Hailaer Basen

For the complicated tectonic characteristics of Hailaer basin, this paper made full use of 2-d and 3-d seismic data,and adapt the method of inertia associating with activity and the local associating with the whole,and systematically studied the kinetic characteristics of the structures in the basin,and then analysed the evolution history and origin mechanism of the basin.Through the research of the knowledge, draws the following:1.According to the type of sequence interface and its characteristics, the basin can be divided into the two basic tectonic layers, i.e.basinal and basement tectonic layer, the former are subdivided into 4 first order tectonic layers and 6 secondary order layers.2.The subsiding history analysis indicates that the Hailaer basin can be divided into three distinct subsiding curtain, i.e. the rapid subsiding,stable subsiding and slow subsiding period. Different depression shows different subsiding characteristics, which reflects the characteris- tics of different extenssion in different depression.3 Hailaer basin developed over the Haixi fold basement in the Mz-Cz era, it formed by reactivating of pre-existence compressionin-wrench fractures, in the later period process of evolution, the effect stress of extension, shear and compressional inversion rooted in the movement pattern of the Kula-Pacific oceanic plate, i.e.depends on the direction, speed and angle of Kula- Pacific plate subduction to Eurasian plate.4.From the formation and reformation of the basin , Hailaer basin can be divided into six formation periods and four reformation periods.