四川会理县岔河唐家湾锡多金属矿床地质特征与找矿方向

发布时间：2018-05-08 03:25

本文选题：天宝山组 + 锡矿　；参考：《成都理工大学》2017年硕士论文

【摘要】：岔河唐家湾锡矿床位于扬子地台西缘,安宁河断裂带东侧,区内地层主要是由一套浅海至滨海相冒地槽火山沉积岩组成。会理地区经历了晋宁—澄江期大规模、高频率的基性、酸性岩浆活动和成矿作用,岩浆活动带来了丰富的锡、铁、铜等成矿物质,具备良好的成矿地质条件。通过野外地质填图、实测剖面、编录钻孔,采样分析,对矿区地质特征和矿床特征进行详细研究,取得以下认识:(1)赋矿地层为天宝山组第二段,地层中变质砂岩、大理岩与黑云母花岗岩的外接触带是矿床产出的有利部位。矿体赋存于不同岩性层的界面间,呈似层状、透镜状产出。黑云母花岗岩具富碱、钾,贫镁、钙的特征,指示岩石属于过铝质、富钾钙碱性—钾玄武岩系列。黑云母花岗岩主量元素和稀土元素特征揭示花岗岩的成岩物质主要来源于上地壳重熔的泥岩,形成环境为板内环境。(2)岔河复背斜及区内发育的次级近EN向背斜,为矿床提供了有利的赋矿空间。不同岩性的层间滑动面、断层破碎带等构造薄弱带,为含矿热液的流动及成矿物质沉淀,提供了有利条件。矿体形成后,断层对矿体有一定破坏作用。(3)矿石的结构构造复杂,矿石中矿物组成变化较大,具分带性,在内接触带为简单矽卡岩矿物组合,外接触带为复杂矽卡岩矿物组合。分析数据表明,锡矿品位0.3~0.8%,铜矿品位0.2~1.0%,锡、铜品位变化较大。矿石中伴生有锌、钨、银等有益组分,可综合利用。矿床成矿物质来源于黑云母花岗岩体、天宝山组第二段地层、变质辉绿岩,结合野外地质调查,认为黑云母花岗岩体分布广、规模大,为矿床主要的成矿物质来源。(4)在肖家火地、何家屋基一带浅部有大量花岗岩体,这些地方的花岗岩与天宝山组地层的外接触带,是今后主要的找矿方向。何家屋基一带,背斜构造较为发育,已发现少量矿化点,初选为找矿靶区。
[Abstract]:The Chahe Tangjiawan tin deposit is located on the western margin of the Yangtze platform and on the east side of the Anning River fault zone. The strata in the area are mainly composed of a set of volcanic sedimentary rocks from shallow sea to coastal facies. The Huili area experienced large scale, high frequency basic, acid magmatic activity and mineralization in Jinning Chengjiang period. Magmatic activity brought abundant tin, iron, copper and other minerals, and had good metallogenic geological conditions. Through field geological mapping, measured section, cataloguing and drilling, sampling and analysis, the geological characteristics and deposit characteristics of the mining area are studied in detail. The following conclusions are obtained: the ore-bearing strata are the second stage of Tianbaoshan formation, and the metamorphic sandstone in the strata. The outer contact zone between marble and biotite granite is a favorable place for ore deposit. The orebody occurs between the interfaces of different lithologic layers and appears as laminar and lenticular. The biotite granite is characterized by alkali, potassium, poor magnesium and calcium, indicating that the rocks belong to peraluminous, K-rich calc-alkaline-potassium basalt series. The characteristics of major elements and rare earth elements of biotite granites reveal that the diagenetic material of the granite is mainly derived from the mudstone remelted in the upper crust, and the forming environment is the intraplate environment. 2) the Chahe complex anticline and the secondary en anticline developed in the area. It provides favorable ore-hosting space for the deposit. Structural weak zones such as interlaminar sliding surfaces and fault fracture zones of different lithologic properties provide favorable conditions for the flow of ore-bearing hydrothermal fluids and the precipitation of ore-forming materials. After the formation of the orebody, the fault has a certain destructive effect on the orebody. The structure and structure of the ore are complicated, the mineral composition of the ore changes greatly and the ore is zoned. The inner contact zone is a simple skarn mineral assemblage, and the outer contact zone is a complex skarn mineral association. The results show that the grade of tin ore is 0.30.80, the grade of copper is 0.21.0, and the grade of tin and copper varies greatly. The ore is accompanied by zinc, tungsten, silver and other beneficial components, which can be comprehensively utilized. The ore-forming material originates from the biotite granite body, the second member of Tianbaoshan formation, metamorphic diabase. Combined with the field geological investigation, it is considered that the biotite granite body is widely distributed and has a large scale. There are a large number of granite bodies in the shallow part of Hejiawuji area in Xiaojiahuodi. The outer contact zone between the granite and the Tianbaoshan formation is the main prospecting direction in the future. In the area of Hejiaowuji, anticline structure is relatively developed, a few mineralization points have been found, and the primary selection is the prospecting target area.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.2

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