滇西北羊拉铜矿床成矿期构造应力场数值模拟与找矿预测

发布时间：2018-01-19 02:25

本文关键词： 矿床构造构造应力场数值模拟成矿预测　出处：《昆明理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：羊拉铜矿床位于金沙江构造结合带中部,是滇西北地区代表性矿床之一,该矿床为滇西北铜锌多金属成矿带上典型的后生叠加作用形成的斑岩-矽卡岩型矿床。区内铜矿床受构造控制明显,研究区内构造控矿作用具有重要意义。本文在总结近年来取得的勘查成果基础上,结合勘查实践,从区域地质特征入手,以里农、江边及路农等典型矿区为代表,采用成矿构造数值模拟,研究了矿区的成矿机理,总结了区内成矿规律,对区内勘查工作的部署有直接的指导作用。研究区主要大断裂构造起着导岩、导矿的作用,其派生断裂构造是岩浆、热液、矿质的运移通道,次级同向、派生断裂、次级褶皱轴部、转折端,裂隙带、层间挤压带和破碎带等,特别是构造交汇和转换部位,更是容矿和储矿场所,多数矿体均产于构造破碎带或层间裂隙带中。从模拟结果综合分析可以得出,最大主压应力的异常区控制了该区域节理裂隙的发育及其分布方向,剪切应力的异常高区域控制了次级断裂和节理裂隙的发育,以及后续矿脉的发育。该区域的应变能应力场特征也控制了研究区岩石裂隙和孔隙中流体的压力,进而控制了流体的运移规律,即成矿流体由高应力区向低应力区运移和聚集。另外,高应力的流体运移至低应力区,由于流体压力的降低,更有利于流体中所溶解矿质的沉淀和析出。通过对成矿期构造应力场数值模拟结果与矿体空间分布之间的关系的研究,总结了今后的找矿方向,提出了三个有利找矿方向。
[Abstract]:The Yangla Copper Deposit is located in the Jinsha River with the tectonic belt, Northwest Yunnan is one of the typical deposits, the deposit is northwest Yunnan copper zinc polymetallic metallogenic belt on the formation of epigenetic superposition of typical porphyry skarn deposit area. Copper deposit is obviously controlled by structure. In the research area of great significance to construct control mine. This paper made in recent years on the basis of the results of the survey, combined with the exploration practice, from the regional geological characteristics of the river and the farmers to agricultural, such as the representative of the typical mining area, using numerical simulation of tectonic and metallogenic mechanism of mining area, summarized the metallogenic regularity of area, work area of exploration deployment have a direct role in guiding. The major faults in the study area plays a guiding role in guiding mine, the faults are derived magma, hydrothermal mineral, migration channel, secondary to the derived fracture, secondary fold axes, The turning point, fracture zone, interlayer extrusion zone and fracture zone, especially the structure and conversion parts is the ore and mineral storage sites, most ore bodies are produced in the structural fracture zone or interlayer fracture zone. It can be concluded from the comprehensive analysis of the simulation results, the abnormal area of maximum principal stress control the direction of the regional development and distribution of joints, abnormal regional shear stress control secondary fracture and joint development, and the development of follow-up. The vein strain can also control the stress field characteristics of study area rock fissure and pore fluid pressure, and then control the movement of fluid that is, the ore-forming fluid from high stress area to low stress zone migration and accumulation. In addition, the high stress fluid migration to low stress area, due to decreased fluid pressure, more conducive to the precipitation and precipitation of dissolved mineral fluid. Through the mineralization period The relationship between the numerical simulation results of tectonic stress field and the spatial distribution of ore body is studied, and the prospecting direction in the future is summarized, and three favorable prospecting directions are put forward.

【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.41

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