| Huayingshan structure belts which are the boundary between the low uplift inthe central of Sichuan basin and steep structure in the eastern of the basin originatenorth in Xuanhan-Huangjingkou, and go through Hechuan,Yibing, which lie south toJinchuan.We could know the relationship between the Central Sichuan and EastSichuan block by studying the structural styles in the spatial distribution, transitionrelations of this belt, and its displacement transfers of the two block, the formationtime of Huayingshan Moutain structure belt. In this paper, the fine interpretations ofseismic profiles in the structure belt have been accomplished with the application oftectonics and fault-related folds geometry principles. We try to understand thegeometric and kinematic structures of the structure belt by integrating the geologymap, seismic reflection profiles, remote sensing, DEM and well drilling data.Westudy the formation time of the different parts in structure belt by the method ofapatite fission track.1. Our studies find that there are multi-detachment layers with differentvertical strata in the Huayingshan Mountains structure belts.The upper deformationstrata whose base are Leikoupo formation of Lower Triassic develop propagationfault which displacement is not much.The middle deformation strata betweenCambrian and Jialingjiang formation of Lower Triassic develop imbricate structureand shear fault bend fault;The lower deformation strata between basement andSinian develops structure wedge.The lower structures develop first, and effect thegeometry of Middle and Upper strata.Then the structures develop in Middledeformation, superimpose and reform the antecedent structural feature, the structuresin the Upper deformation develop finally.2.The geometry and kinematics characters are unfamiliar in the HuayingshanMoutain structure belts: the imbricate wedges are developed between Cambrian andJialingjiang formation of Lower Triassic in the Huangjingkou, the displacement canreach to40km, and wedges are formed in the basement.In the northern ofHuayingshan Moutain,a huge structure are developed between the Cambrian and Jialingjiang formation of Lower Triassic which displacement is about10km.In thecentral of Huayingshan Moutain,a propagation fault is formed in the structurewedge,and the Cambrian is uplifted to the surface,and the structures formed earlierare tilted..In the southern of Huayingshan Moutain,the compress from east to westdecreased,but the Central block effected more intense,the structure wedges andreserve fault which move from west to east are developed,the displacement is about5km.3.The uplift of Huayingshan Moutain structure belts are divided into twostages by apatite fission track,the first stage was in the90-100Ma,and then upliftedin the10-20Ma.The formation time of the structure belts was about equal. |
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