陕西石泉档山金矿床成矿地质特征及成因研究

发布时间：2018-05-23 18:17

本文选题：金矿床 + 成矿地质特征　；参考：《东华理工大学》2017年硕士论文

【摘要】：大巴山构造带自元古代开始就发生了一系列构造运动,在运动过程中形成了其丰富的矿产资源。本文依托《陕西省石泉县档山地区金矿详查》项目,以地处大巴山加里东褶皱带紫阳中锋褶皱束石泉-紫阳基性岩带的档山金矿床为研究对象,通过对区内辉长岩进行岩相划分,对辉长岩过渡带中的蚀变-碎裂金矿化带的地质特征、构造热液与矿化蚀变之间的关系进行研究,讨论了研究区的成矿地质特征,划分了金成矿的成矿期与矿化阶段,讨论了矿床成因。通过对研究区内辉长岩蚀变-碎裂金矿化带的成矿规律和找矿标志进行总结,对同类型的金矿地质勘查能起到指导作用。本次研究工作取得以下认识:早古生代辉长岩脉中发育的揉皱挤压破碎带是档山金矿床的主要控矿构造,辉长岩脉是金矿的主要赋矿地质体。认为研究区内构造演化经历了5个阶段:岩浆侵入阶段—挤压变形褶皱阶段—继续挤压褶皱变形呈倒转背斜阶段—抬升剥蚀阶段—稳定至现今阶段;前三个演化阶段发生的构造—岩浆活动过程中产生的热液作用,对矿区金元素的活化、迁移、富集起到了决定性的作用。金矿带与次级揉皱挤压破碎带或碎裂带基本同位分布,早古生代辉长岩是档山金矿的主要矿源层。多期次构造活动促使金元素发生活化、迁移并富集成矿,断裂构造为金成矿提供了良好活化迁移的动力、途径和赋矿空间。档山金矿属构造蚀变岩型金矿。对档山矿区后续金矿找矿扩大提出了工作建议,认为辉长岩体与寒武—奥陶洞河群接触部位是下一步金矿找矿的重点区段,潜力评价和勘查工作中应注重两者接触部位的含金性研究。
[Abstract]:A series of tectonic movements have taken place in the Dabashan tectonic belt since the Proterozoic, during which rich mineral resources were formed. Based on the detailed investigation of gold deposits in Tushan area, Shiquan County, Shaanxi Province, this paper takes the Tangshan gold deposit, which is located in the center of Ziyang fold belt in the Caledonian fold belt of Dabashan, as the object of study. Through the lithofacies division of gabbro in the area, the geological characteristics of the alteration and fragmentation gold mineralization zone in the transitional zone of gabbro, the relationship between tectonic hydrothermal solution and mineralization alteration are studied, and the metallogenic geological characteristics of the study area are discussed. The metallogenic period and mineralization stage of gold mineralization are divided and the genesis of the deposit is discussed. By summarizing the metallogenic regularity and prospecting criteria of the gabbro alteration-cataclastic gold mineralization zone in the study area, it can play a guiding role in the geological exploration of the same type of gold deposits. The results show that the crinkle crushing zone developed in the early Paleozoic gabbro vein is the main ore-controlling structure of the Tzushan gold deposit and the gabbro vein is the main ore-hosting geological body of the gold deposit. It is considered that the tectonic evolution in the study area has undergone five stages: magmatic intrusion stage, compressional deformation fold stage, continuous compression fold deformation, inverted anticline stage, uplift and denudation stage, stabilization to present day stage; The hydrothermal processes during the tectonic-magmatic activity in the first three stages of evolution play a decisive role in the activation, migration and enrichment of gold elements in the mining area. The gold belt and the secondary crinkle crush zone or fragmentation zone are basically distributed in the same position. The early Paleozoic gabbro is the main source bed of the Tushan gold deposit. Multiple tectonic activities promote the activation, migration and enrichment of gold elements, and fault structures provide a good motive force, approach and ore-hosting space for gold mineralization. Tushan gold deposit belongs to structural altered rock type gold deposit. The paper puts forward some suggestions for the extension of gold prospecting in the Tangshan mining area. It is considered that the contact site between the gabbro body and the Cambrian-Ordovician Donghe Group is the key section of the next gold prospecting. Attention should be paid to the study of gold content in potential assessment and exploration.
【学位授予单位】：东华理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.51

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