甘肃阳山金矿区变形特征研究

发布时间：2018-04-22 10:13

本文选题：阳山金矿区 + 变形特征　；参考：《中国地质大学(北京)》2016年硕士论文

【摘要】：甘肃省南部的阳山金矿是我国的超大型金矿床之一,其地处复杂的板块交汇地带,区内构造变形复杂而强烈,具有较强的研究价值。因此,本文在《甘肃省阳山金矿带构造控矿规律研究》项目的依托之下,对区内复杂的构造分期及构造变形特征分析进行研究。在借鉴前人研究成果的同时,本文运用构造解析的原理及构造对比的方法,通过对野外实际现象的观测,总结地表与地下、宏观和微观构造变形的特征。最终完成对阳山金矿区变形特征进行学习研究。主要取得以下几点认识:阳山金矿区内发育大量透入性面理、线理以及多种样式的褶皱构造。线理优选产状倾伏向为108°;褶皱枢纽的优选倾伏向为110°;面理的优势倾向为NNE向,平均产状为45°∠50°。以上结论表明区域构造主应力方向为NNE-SSW;阳山金矿带发育有大量的显微构造现象,表现出韧-脆性变形的特点。显微构造所反映的区域主应力方向应于18°-330°之间。与前文测量大量产状所得结果相;石英古应力差值为37.21 MPa左右,反映出表层-浅层的构造作用;对EBSD实验石英极图中低温组构模型的分析指示了研究区北向南的逆冲剪切指向,与显微构造所指示剪切指向一致;通过对阳山金矿区范围的逆冲推覆构造南北边界的观测研究,结合矿区内岩层构造变形特点,确定阳山金矿区整体岩层变形有韧性通道流的特点;对地表(草坪梁路线)及地下(平硐)构造现象的观测研究,将阳山金矿区可识别的构造期次划分为四期;并根据观测到的不同期次岩脉特征,结合各个构造期次的应力特点,总结出变形期次与岩脉形成间的耦合机制。
[Abstract]:Yangshan gold deposit in the south of Gansu Province is one of the super large gold deposits in China. It is located in the complex plate intersection zone. The tectonic deformation in the area is complex and strong, which has strong research value. Therefore, based on the project of "study on structural ore-controlling law of Yangshan gold belt in Gansu Province", the complex structural stages and structural deformation characteristics in this area are studied in this paper. By using the principle of structural analysis and the method of structural contrast, the characteristics of surface, underground, macroscopic and microscopic tectonic deformation are summarized by observing the actual phenomena in the field. Finally, the study on deformation characteristics of Yangshan Gold Mine area was completed. The main results are as follows: a large number of permeable facets, lines and fold structures of various styles have been developed in Yangshan Gold Mine area. The preferred tilting direction of linear optimum selection is 108 掳, the preferred tendency of fold hinge is 110 掳, and the dominant tendency of plane is NNE direction, with an average occurrence of 45 掳~ 50 掳. The above conclusions indicate that the principal stress direction of the regional tectonics is NNE-SSW.The Yangshan gold belt has a large number of microstructural phenomena, showing the characteristics of ductile-brittle deformation. The direction of regional principal stress reflected by microstructures should be between 18 掳- 330 掳. The paleostress difference of quartz is about 37.21 MPa, which reflects the tectonism of surface to shallow layer, and the analysis of low-temperature fabric model in quartz pole map of EBSD experiment indicates the direction of thrusting and shearing in the north to south of the study area. In accordance with the shear direction indicated by microtectonics, based on the observation of the north and south boundary of the thrust nappe structure in the Yangshan gold deposit area, combined with the structural deformation characteristics of the strata in the mining area, It is determined that the deformation of the whole rock layer in Yangshan gold deposit has the characteristics of ductile channel flow, and the observational study on the surface (lawn beam route) and underground (adit) structural phenomena divides the recognizable tectonic period of Yangshan gold deposit into four stages. According to the observed characteristics of different periods of veins and combined with the stress characteristics of each tectonic period, the coupling mechanism between the deformation stage and the formation of the vein is summarized.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：P618.51

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