Tectonic Deformation Characteristics And Formation Mechanism Of Xigigida Formation In Xiachang Vanadium - Titanium Iron And Steel In

The Xigeda strata is widely distributed in southeast of Tibet Plateau of China as well as the margin of the rivers and its tributaries valley area. The formation mechanism of Xigeda remains controversial due to the special geographical location, frequently human engineering and economic activities and the complex regional tectonic deformation. Therefore, to study the control effects of Xigeda strata tectonic deformation features of Xigeda strata to the Xigeda strata formation help to reveal the genesis of Xigeda formation and understand the regional geological tectonic evolution history of this area, especially for the uplift process of Tibet Plateau, and guide the engineering construction of this area. In this paper, we take the Xichang Panzhihua New steel vanadium titanium base project area of Xigeda formation as the research object. The regional geological background of the project area, the Xigeda formation distribution and regularity, the Xigeda deformation characteristics and the cause of Xigeda composition are the major research content. We discuss the structural deformation of the Xigeda strata, the tectonic evolution process of engineering zone as well as the formation mechanism of the Xigeda formation based on a large number of field investigation and indoor data analysis. The geological investigation and engineering analysis method are used to the discussion based on the existing Xigeda strata structure and genetic research, types, tectonic deformation, tectonic deformation, history of tectonic kinematics geometry deformation. Finally, we get the following conclusion:(1) The discrepancy of sedimentary environment in different parts of the Xigeda formation is significant. The Luding geological profile reveal a lake or swamp sedimentary environment. The Dadu River Hanyuan Fulin Xigeda reveal the fluvial sedimentary facies. The Anning River Xichang-Dechang Xigeda in lots of different area reveal a more swamp facies, fluvial and swamp facies sedimentary environment. While, the Panzhihua Xigeda group is more reveal the sedimentary environment of this area belongs to the limnetic facies sedimentary.(2) The excavation geological profile of the project area reveal that the mainly contemporaneous tectonic deformation type of the Xigeda strata is sliding collapse structure and Xigeda group interior angle unconformity contact. The effects of the earthquake and the deposition profiles of the engineering area reveal that the Xigeda strata has soft sedimentary structural features.(3) The difference of Xigeda formation tectonic deformation in different regions mainly controlled by the influence of deposition heterogeneity and the distances of active fracture and earthquake focus. The sketch of Xigeda geological profile of engineering excavation project area reveal that the Xigeda formation mainly controlled by the near east compressive stress. The force direction is nearly perpendicular to the regional tectonic and quiet river fault zone and the wood River fault zone tectonic principal direction, which reveal that the tectonic activity in the project area related to the earthquake activity.(4) The constitution of the Xigeda sedimentary units may be belong to fluvial facies (e.g., bed slope is very small braided drainage), lake facies, marsh phase, are more likely belong to the transition environment of the three sedimentary environment (rivers and lakes, early facies, lacustrine facies and river, lake and swamp), rather than glacial deposits formed.(5) We preliminary infer the project area has go through four stages of tectonic movements based on the periphery of the topography, lithology, tectonic characteristics. The Xigeda formation occurred complex tectonic deformation since the late Pleistocene Xigeda due to the influence of near field fault and seismic activity in different sedimentary facies and modern fluvial deposition process. The temporal and spatial heterogeneities distribution of tectonic deformation characteristics reflects complexity deposition process of the Xigeda formation in the west of Panzhihua.