云南省香格里拉县东坡钨矿成矿地质条件分析
发布时间：2019-01-02 11:31
【摘要】：云南省香格里拉县东坡钨矿位于香格里拉县城158°方向、直距80km处,行政隶属虎跳峡镇东坡村管辖。研究区处于扬子陆块的西缘、康滇陆块的南缘,隶属于松潘 甘孜褶皱带南段、小金河 三江口断裂的西侧、金沙江断裂东盘上。东坡钨矿地处虎跳峡背斜西翼、南北向导矿断裂金沙江深大断裂(F1)之抬升盘,受哈巴 玉龙雪山造山带前陆推覆构造控制,逆冲断裂构造系控制了区内钨铍、白钨等矿床的分布。本文通过广泛的资料收集,在分析总结前人工作成果基础上,经过详实的野外实地调研,搜集大量的地质信息,并结合矿区探矿工程和系统采样分析,运用岩石学、矿物学、矿床学、构造地质学、地球化学、成矿预测学等多种理论和方法,从研究区域成矿地质背景入手,通过对矿层(体)特征,构造特征,岩性岩相分布等方面进行深入分析,全面掌握了构造及围岩蚀变种类与矿体的分布规律,找出了关键控矿因素,阐明了成矿地质条件和成矿规律,初步总结了矿床成因及找矿标志,并对研究区进行了远景预测评价。本文认为研究区以火山碎屑为主夹粘土质、碳酸盐岩的混杂沉积是钨原始“矿源层”,经区域变质和长期活动的哈巴—玉龙雪山造山作用及构造活动,逆冲断裂两侧的层间剥离扩容,为成矿热液的运移和聚集的良好通道和场所。矿区厚大的层状白钨矿体沿逆冲断裂(F2)分布,矿体规模与形态受逆冲断裂两侧层间破碎带、劈理化带及蚀变带联合控制,白钨矿赋存于上二迭统基性火山岩系和中三叠统的碳酸盐岩、火山碎屑岩系。成矿断裂带早期形成次级断裂及顺层破碎带,之后叠加与顺层断裂斜交的剪切劈理化带,形成了包括硅化石英脉(带)等次生蚀变和同期的钨矿化,即断裂构造提供矿化形成的有利通道和含矿热液在有利蚀变岩性(基性火山岩和碳酸盐岩)中热液蚀变交代与矿化的富集,后期长期的热液蚀变对矿床进行了叠加改造。因此本矿床属以断裂构造控制为主的高中温沉积—热液叠加改造型钨矿床,其成矿时代可能为喜马拉雅早期。
[Abstract]:Dongpo tungsten mine in Shangri-La County of Yunnan Province is located in the direction of 158 掳in Shangri-La County, directly away from 80km, and the administration is under the jurisdiction of Dongpo Village of Hujiaoxia Town. The study area is located in the western margin of Yangtze block and the southern margin of Kangdian block, which belongs to the southern section of Songpanzhuangzi fold belt, the west side of little Jin He's fault of Sanjiangkou, and the east plate of Jinshajiang fault. Dongpo tungsten deposit is located in the west wing of the Hujiaoxia anticline. The uplift plate of Jinshajiang deep fault (F1) in the north-south guide mine is controlled by the Foreland nappe structure of the Hababan Yulong Xueshan orogenic belt, and the thrusting fault tectonic system controls the beryllium in the area. Distribution of scheelite deposits. Through extensive data collection, based on the analysis and summarization of previous work results, through detailed field investigation and field investigation, this paper collects a large amount of geological information, and combines with mining area prospecting engineering and systematic sampling analysis, using petrology and mineralogy. Ore deposit, tectonics, geochemistry, metallogenic prediction and other theories and methods are analyzed from the geological background of the study area, and through the analysis of ore-bed (body) characteristics, structural characteristics, lithologic lithofacies distribution and so on. This paper comprehensively grasps the distribution law of structural and wall rock alteration types and orebodies, finds out the key ore-controlling factors, clarifies the ore-forming geological conditions and metallogenic rules, and preliminarily summarizes the genesis and prospecting marks of the deposits. The prospective prediction and evaluation of the study area are also carried out. In this paper, it is considered that the study area is dominated by pyroclastic clayey, the mixed deposits of carbonate rocks are the original "source beds" of tungsten, and the orogeny and tectonic activity of the Haba-Yulong Snow Mountain, which is characterized by regional metamorphism and long-term activity. The exfoliation and expansion of the interlayer on both sides of the thrust fault is a good channel and place for the migration and accumulation of ore-forming hydrothermal solution. The thick layered scheelite bodies are distributed along thrust faults (F2). The size and shape of ore bodies are controlled by the interlaminar fracture zone, split physicochemical belt and alteration zone of both sides of the thrusting fault. Scheelite occurs in the upper Permian basic volcanic series and the middle Triassic carbonate rock and pyroclastic rock series. In the early stage of the metallogenic fault zone, secondary faults and bedding fracture zones were formed, and then the shear cleavage zones were superimposed on the diagonal faults, resulting in secondary alteration, such as silicified quartz veins (belts), and simultaneous tungsten mineralization. That is to say, the fault structure provides a favorable channel for mineralization and the hydrothermal solution of ore bearing in favorable alteration lithology (basic volcanic rock and carbonate rock) is enriched in hydrothermal alteration metasomatism and mineralization. In the late stage, the deposit was superimposed by long-term hydrothermal alteration. Therefore, the deposit belongs to the high temperature deposition-hydrothermal superimposed and reformed tungsten deposit dominated by fault structure, and its metallogenic age may be in the early Himalayan period.
【学位授予单位】：东华理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.67
本文编号：2398425
[Abstract]:Dongpo tungsten mine in Shangri-La County of Yunnan Province is located in the direction of 158 掳in Shangri-La County, directly away from 80km, and the administration is under the jurisdiction of Dongpo Village of Hujiaoxia Town. The study area is located in the western margin of Yangtze block and the southern margin of Kangdian block, which belongs to the southern section of Songpanzhuangzi fold belt, the west side of little Jin He's fault of Sanjiangkou, and the east plate of Jinshajiang fault. Dongpo tungsten deposit is located in the west wing of the Hujiaoxia anticline. The uplift plate of Jinshajiang deep fault (F1) in the north-south guide mine is controlled by the Foreland nappe structure of the Hababan Yulong Xueshan orogenic belt, and the thrusting fault tectonic system controls the beryllium in the area. Distribution of scheelite deposits. Through extensive data collection, based on the analysis and summarization of previous work results, through detailed field investigation and field investigation, this paper collects a large amount of geological information, and combines with mining area prospecting engineering and systematic sampling analysis, using petrology and mineralogy. Ore deposit, tectonics, geochemistry, metallogenic prediction and other theories and methods are analyzed from the geological background of the study area, and through the analysis of ore-bed (body) characteristics, structural characteristics, lithologic lithofacies distribution and so on. This paper comprehensively grasps the distribution law of structural and wall rock alteration types and orebodies, finds out the key ore-controlling factors, clarifies the ore-forming geological conditions and metallogenic rules, and preliminarily summarizes the genesis and prospecting marks of the deposits. The prospective prediction and evaluation of the study area are also carried out. In this paper, it is considered that the study area is dominated by pyroclastic clayey, the mixed deposits of carbonate rocks are the original "source beds" of tungsten, and the orogeny and tectonic activity of the Haba-Yulong Snow Mountain, which is characterized by regional metamorphism and long-term activity. The exfoliation and expansion of the interlayer on both sides of the thrust fault is a good channel and place for the migration and accumulation of ore-forming hydrothermal solution. The thick layered scheelite bodies are distributed along thrust faults (F2). The size and shape of ore bodies are controlled by the interlaminar fracture zone, split physicochemical belt and alteration zone of both sides of the thrusting fault. Scheelite occurs in the upper Permian basic volcanic series and the middle Triassic carbonate rock and pyroclastic rock series. In the early stage of the metallogenic fault zone, secondary faults and bedding fracture zones were formed, and then the shear cleavage zones were superimposed on the diagonal faults, resulting in secondary alteration, such as silicified quartz veins (belts), and simultaneous tungsten mineralization. That is to say, the fault structure provides a favorable channel for mineralization and the hydrothermal solution of ore bearing in favorable alteration lithology (basic volcanic rock and carbonate rock) is enriched in hydrothermal alteration metasomatism and mineralization. In the late stage, the deposit was superimposed by long-term hydrothermal alteration. Therefore, the deposit belongs to the high temperature deposition-hydrothermal superimposed and reformed tungsten deposit dominated by fault structure, and its metallogenic age may be in the early Himalayan period.
【学位授予单位】：东华理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.67
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2 宋世伟;张成江;宋昊;张腾蛟;;义敦岛弧带晚三叠世火山碎屑岩中的两类铅锌成矿作用分析[J];矿物学报;2013年S2期
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