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Paul hickory flooring Zn mining area in western Yunnan F_1 faults and deformation analysis Mineralization

Author: HuangQinHui
Tutor: XueChuanDong
School: Kunming University of Science and Technology
Course: Structural Geology
Keywords: Tectonic deformation Microstructure Kinetic analysis Hetaoping lead-zinc deposit Yunnan
CLC: P618.4
Type: Master's thesis
Year: 2010
Downloads: 133
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Abstract


Paul hickory flooring Zn mining area in western Yunnan is located in Baoshan - zhenkang northern Baoshan Block - Shidian complex trending anticline and Lancang deep structural - metamorphic belt Interchange Hetaoping double plunging anticline north east side, in Baoshan, Lanping - Simao, Changning - Menglian three micro-plate convergence zone and biased Baoshan side. F1 fault is the region's main lead-zinc deposit ore-controlling structure, V1 main orebody distribution along the fault strike, a variety of tectonic deformation phenomenon is more abundant. In this thesis, based on today's fault distribution Fl basic aspects of its tectonic features of alteration minerals from rocks and tectonic deformation microstructures intragranular fluid inclusions track surface (FIP) characteristics of the start, and with mineral microanalysis microstructural analysis techniques, from different angles, fine structure analysis of fluid into the endogenous development activities left microstructural features, a systematic study of the ore deposit period (phase) fluid structure interaction characteristics and to determine the spatial and temporal fracture F1 evolution ordinal analysis of its occurrence, development and evolution of ore-controlling faults explore the role and structure of the fluid migration. Thesis research results and knowledge to achieve the following: (1) This paper first F1 fracture surface mechanical properties of macroscopic structures, analyzes its structure type, size, mechanical properties, the results show that, F1 fault is a thrust fault has occurred at least three tectonic activity, experienced a right line pressure shear → → sinistral shear and compression-shear mechanical properties change. (2) macroscopic deformation to rock penetrative foliation, non-penetrative Zhang, joints and shear resistance formed by tectonic squeezing small folds based. (3) microscopic deformation, including microscopic fissures, wavy extinction, mechanical twinning, dynamic recrystallization, stress shadow and rotation spots and other residues, including quartz containing abundant fluid inclusions decent (FIP), is the migration of ore fluids composition changes during stress and details of the original recording device. Microstructural deformation characteristics reflect faults in the toughness - brittle deformation conditions happen. Conjugate joints, micro cracks and veins and FIP occurrence on the direction of principal stress directions consistent with the macro-structure for nearly north-south and east-west in both directions. The dynamically recrystallized quartz Estimating, mineralization of the stress difference 38.1-56.5 Mpa, tectonic deformation intensity is moderate. The use of dynamically recrystallized grains of quartz thermometer fractal calculations to determine the deformation temperature is lower greenschist facies (300 ℃ ~ 500 ℃). Throughout the process of mineralization quartz, quartz inclusions mostly pure liquid and gas-liquid two-phase type. V, orebody quartz, calcite inclusions in temperature results show that hydrothermal mineralization has gone through a high temperature (250 ~ 300 ℃) and low temperature (100 ~ 230 ℃) two hydrothermal mineralization stage, the former may correspond to hydrothermal skarn - sulphide mineralization stages, which correspond to hydrothermal vein sulphide - carbonate mineralization phase. (4) at the macro and micro-structure based on the analysis of lead-zinc ore district Hetaoping mechanism to do a preliminary analysis, lead and zinc mineralization is closely related with the F1 fault, the entire fault system controls the generation of ore fluids, evolution, migration until mineralization. Early tectonic deformation of ore fluid migration provides the main channel; interim tectonic deformation control of the mineralization process, creating a mineralized physical and chemical conditions necessary and critical stress mechanism for the enrichment of mineral precipitation ideal place; late shear deformation resulted in the low-temperature superposition of mineralization. Fluid as a mineralizing incentives plays to promote deformation, cracks expansion, mineral enrichment and the important role of transport. (5) for the mining structure - Fluid - ore mineralization system fault tectonic deformation parsing, one conducive to a comprehensive understanding of the mechanical properties of faults and tectonic evolution, but also for fine recognition and remodeling difficult to identify hydrothermal vein Mineral Deposits and dynamics mechanism provides effective constraint.

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CLC: > Astronomy,Earth Sciences > Geology > Of ore deposits > Deposit classification > Non-ferrous metals
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