滇西腾冲小龙河锡矿床地质特征及找矿方向研究

发布时间：2018-04-11 04:02

本文选题：矿床地质特征 + 矿床成因　；参考：《昆明理工大学》2017年硕士论文

【摘要】：小龙河锡矿区位于腾冲地块,处在滇西锡成矿带腾冲-梁河成矿亚带。通过矿区地质调查、矿体产出特征、矿石特征、成矿期次和矿物生成顺序等方面的研究,查明了其矿体分布规律、断裂容矿控矿特征、矿床成因及大致的成矿年代,总结了该矿床控矿因素及成矿规律,在此基础上,结合矿区地质条件以及物、化探、重砂异常成果资料,综合提出了新的找矿方向。本次主要取得以下成果和认识:1.石炭系上统空树河组变质砂岩与花岗岩的内、外接触带有关的云英岩、矽卡岩、蚀变花岗岩是主要的含矿岩石。根据矿体成因及产状,可将小龙河矿区的矿体划分为三类,分别是产于花岗岩体内、外接触带中呈缓倾斜层状产出的矽卡岩型、于矽卡岩下部呈面形产出的云英岩面型、赋存于花岗岩内裂隙呈陡倾斜脉状产出的云英岩脉型。2.矿区断裂以南北向、北北西向为主,区内含锡云英岩脉大多沿北北西向裂隙组充填交代成矿,形成沿北北西向延伸的云英岩锡矿(化)带。3.小龙河锡矿床的类型为接触交代矽卡岩型叠加气成-高温热液云英岩型锡矿床。矿化中中粒含斑黑云母花岗岩侵入体(猫舔石单元)属于燕山晚期陆壳深层重熔花岗岩,为锡矿床的成矿母岩。4.根据重砂异常特征,结合矿区地质特征和矿床类型,在小龙河矿区及外围圈定了 6个找矿远景预测区。
[Abstract]:Xiaolonghe tin mine is located in Tengchong block and in the Tengchong-Lianghe metallogenic subzone of the tin metallogenic belt in western Yunnan.Based on the geological investigation, orebody production characteristics, ore characteristics, metallogenic times and the sequence of mineral formation, the distribution of ore bodies, the ore-controlling characteristics of faults, the genesis of ore deposits and the approximate metallogenic age are found out.The ore-controlling factors and metallogenic rules of the deposit are summarized. On the basis of this, a new prospecting direction is proposed synthetically, combining with the geological conditions of the ore area and the data of anomalous results of geochemical exploration and heavy sand in the ore area.The main achievements and understanding of the following 1. 1.The metamorphic sandstone and granite of the upper Carboniferous Gangshuhe formation are the main ore-bearing rocks related to the inner and outer contact zones of the quartzite skarn and altered granite.According to the genesis and occurrence of orebodies, the orebodies in Xiaolonghe mining area can be divided into three types, which are skarn type occurring in granite body and gently inclined stratified in external contact zone, and quartz rock surface type in the lower part of skarn.In granite, the fractures occur in the form of precipitous-inclined vein type. 2.The faults in the mining area are mainly in the NNE and NNW directions. The tin-bearing quartz veins in the area are mostly filled with metasomatism along the NNW fissures, forming the. 3. 3 band extending along the NW direction of the quartzite tin deposits.The type of Xiaolonghe tin deposit is contact metasomatic skarn type superimposed gas-high temperature hydrothermal quartz tin deposit.The mid-grained biotite granite intrusion (feline licking unit) belongs to the late Yanshanian continental crust deep remelting granite and is the parent rock of tin deposit .4.According to the abnormal characteristics of heavy sand, combined with the geological characteristics and deposit types of the ore area, six ore prospecting prospective prediction areas have been delineated in and around Xiaolonghe mining area.
【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】：P618.44

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