铜陵矿集区燕山期地壳浅部成矿流体活动的构造控矿

为查明铜陵矿集区在燕山期不同层次、不同部位和不同类型的构造的导流-一控矿作用，作者完成了3个构造物理模拟实验，分别模拟了中-深层次断裂系统、浅表部褶皱．断裂系统与中部褶皱系统的应力性质与应变景观；依次分析了不同方向、不同部位和不同层次控矿断裂及褶皱的导流作用，讨论了特定构造部位多种构造形迹复合而成的三维控流系统对流体运输的控制作用。分析表明，在区域地壳浅部的中-深层次，褶皱作用较弱，主要由盖层岩系断裂系统及基底断裂共同组成导流断裂系统，为成矿流体的浅部运输提供了通道；在中-浅层次，褶皱作用较强。褶皱及其相伴生的断裂系统为流体提供了就位空间。

Structural Control of Ore-forming Fluid Activities in Shallow Crust of Tongling Ore Concentration Area in Yanshanian Period

The Tongling ore concentration area experienced the process of early extrusion and late shearing during Indosinian_Yanshanian period, and formed the regional tectonic framework. Meanwhile, the magmatic activity in Yanshanian period was the major factor for the formation of most ore deposits in this area. Therefore, the investigation of the structural control of ore_forming fluid activities in the shallow part of the crust (mainly Mesozoic and Paleozoic strata and the top of basement rocks) during the Yanshanian period is of great significance in the study of regional ore_forming process and prospecting work. Regional structures of this period are very complex and their functions in the control of fluid transportation are different. In order to find out the controlling role played by various structures at different levels and different positions in fluid transportation, the authors performed three analogue experiments, discussed the stress and strain characteristics of the middle_deep level fault system, the sub_surface fold_fault system and the fold system at the middle level, analyzed the fluid transport process in various faults and folds in different directions and different parts, and then constructed the fluid transportation in the 3D controlling web made of faults and folds as well as spatial_temporal transportation of the regional fluid. The study indicates that, due to the week fold process at the middle_deep level of the shallow crust, the cap rock fault system and basement fault system formed the transporting passage web for the subsurface ore_forming fluid. At the middle_low level, folds and their associated fault system supplied the local positions with the ore_forming fluid due to the strong folding process.