Reconstruction Of The Jurassic-Cretaceous Prototype Basin Of Erlian Basin

Based on drilling data,seismic interpretation, the area geological survey report and the field recording data, I studied the formation's lithologic characteristic, stratigraphic correlation and thicknesses of remnant formations of the Jurassic-Cretaceous residual basin,drew the distribution maps. The early-middle jurassic basin is separated into two residual basins, which were the north basin and the south basin. The late Jurassic volcanic stratigraphy distributed along the Daxinganling and basin margin.The lower cretaceous distribute all fifty-three depressions,and each depression has 1~4 residual thickess center. The upper cretaceous distributed along the region near the Bayinbaolige uplift.Structure types and dynamic mechanism about the assemble pattern of extensional normal faults in the plane and profile, and inversion structures,was comprehensively summarized; based on the plate structure theory, tectonic evolution and dynamic mechanism of the Meso-Cenozoic basin was studied together. The conclusion was that basin evolution effect from many ways,such as the interaction of the Eurasian plate and Pacific plate, also the collision effect the Mongolia-Okhotsk suture belt.In this paper, the superimposed structural style was put forward for the first time, and the superimposed models about the structural stytle wers constructed,such as K1 single extension-structure modle, inversion-structure model corresponding to K1 extension-K1 terminal com-pression, J1+2-K1 inherited extension-structure model, strike-slip structure model correspondding to K1strike-slip extension-K1 terminal strike-slip compression, multi-phase of structure model corresponding to J1+2 extension-J3 compression-K1 extension-K1 ter-minal secondary compression,what's more,the coupling relationship between the structural evolution and structural stytle is confirmed. Based on the intergrated research of sedimentary and structural feature, the crucial connection between sedimentary filling and different kinds of fault or the secondary structural belts had been discussed. One law was that depoccenter was in accordance with subsidence center, alluvial fansnearshore subaqueous fan, fan delata and sublacustrine-fan were developed in the aera of listric stytle faults. Also, those types of sedimentary facies and evolution model in the aera of steep slope belt or gentle slope belt were discussed, then, the control action of sedimentary filling from the episodic evolution of the half graben rift was confirmed, generally speaking, the character of the steep slope was more complex than the gentle slope.Those last conclusions were as follows. There were two separate basin during the early-middle Jurassic, they were continental rift-subsiding basin with coal-bearing clastic rocks. Because of the regional compression and inversion,the late Jurassic volcanic stratigraphy distributed along the deep faults in the aera of Daxinganling uplift and the basin margin. The early cretaceous basin was an extensional faulted basin due to static factors including crushing basement framework and long strip basin shape,dynamic factors including the prebious multicycle evolution and dectral shear stress field at the same time, so the basin formation model was special and strong senmentation.The thermodynamic subsidence was the genetic mechanism of the late cretaceous basin with river-lake deposition system in some aera.