云南省香格里拉县铜厂沟钼铜矿地质特征及找矿方向

发布时间：2018-06-04 05:13

本文选题：铜厂沟钼铜矿 + 矽卡岩　；参考：《成都理工大学》2015年硕士论文

【摘要】：研究区云南省香格里拉县铜厂沟钼铜矿,大地构造位置在青藏高原东南部的“三江”地区蜂腰地带与欧亚板块和冈瓦纳板块的交接处、特提斯-喜马拉雅构造域的东缘。区域上位于扬子板块与义敦岛弧、松潘板块的交接部位,是甘孜-理塘缝合带的组成部分,具体位置在义敦岛弧最南端即中甸弧。研究区内二叠系、三叠系地层较发育,矿区分布地层主要为二叠系上统峨眉山玄武岩组(P3e),三叠系中统北衙组(T2b)及少量第四系更新统(Qp)、全新统(Qh)。分属扬子地层区丽江-金平地层分区的鸣音地层小区、中咱-石鼓地层小区,其中三叠系北衙组是重要的含矿层。矿区为一轴向为北东-南西向的背斜构造,纵贯矿区中部,由于受后期断裂破坏,致使背斜出露残缺不全。矿区主干断裂(F1)属拉巴-铜厂-马家垭口断裂的一段,该断裂沿背斜轴部通过,并控制了矿区内岩浆岩的分布及斑岩型钼矿体产状;另一主断裂为F2断裂,控制了矿区矽卡岩型铜钼矿的产状;矿区内有四条次级断裂,主要有近东西向、北西-南东向两组。矿区岩浆岩发育,岩浆岩主要以玄武岩为主,分布于峨眉山玄武岩组(P3e)内,侵入岩主要沿F1断裂分布,呈小型岩株、岩脉、岩枝等零星出露,岩性主要为花岗闪长斑岩(γδπ),石英闪长玢岩(δομ),次为辉绿玢岩(βμ)。其中花岗闪长斑岩、石英闪长玢岩与钼铜矿密切相关。矿区内KT1矿体主要赋存于矽卡岩中,矿床工业类型为矽卡岩型,成因类型为接触交代型铜钼矿床。KT11矿体主要赋存于花岗闪长斑岩及其接触带附近的玄武岩中,矿床工业类型为斑岩型,成因类型为热液型钼矿床。矿区有用金属元素以钼、铜为主,伴生少量银,矿床规模为中型钼铜矿。本文通过对矿床时空分布、构造裂隙、岩浆活动、地球化学、地球物理等的初步研究,与区域内其他燕山期矿床对比,总结此类矿床的初步成矿规律。据矿区地球物理、地球化学成果推测,M1该磁异常强度不高,规模不大,但成矿地质条件好,且有1:5万化探Cu异常(含量大于1000×10-6),具找含铜矽卡岩矿意义;M2由于磁异常有一定规模,且1:5万化探Cu异常已达一级含量,其西侧T2b1与P3e呈断层接触,成矿条件良好,值得进一步开展地质查证;M7在磁异常西北有一1:5万化探Cu异常(含量为1074×10-6)达一级异常含量,该磁异常具进一步找矿意义,若沿磁异常北东方向与F1断裂汇合处打坑道掘进,有机会见矿。矿区内构造丰富,在构造密集区可能会形成深部矿藏;该地区的岩浆岩与成矿关系密切,现已发现的KT11便是位于花椒坪中部的花岗闪长斑岩侵入体与峨眉山玄武岩组的玄武岩接触部位;北衙组的灰岩在靠近花岗闪长斑岩体有矽卡岩化带,鉴于矽卡岩型矿床特点,在该部位可能继续成矿。结合矿区已知工程验证结果、矿床成矿规律等要素,本文定位预测了矿区矿体。
[Abstract]:The tectonic position of Tongchanggou molybdenum copper deposit in Shangri-La County, Yunnan Province is located at the junction of the Beitao belt and Eurasian plate and Gondwana plate in the "Sanjiang" area in the southeast of the Qinghai-Xizang Plateau, and the eastern margin of the Tethys Himalayan tectonic domain. The area is located at the junction of Yangzi plate and Yidun island arc, Songpan plate, which is part of Ganzi-Litang suture zone, and is located at the southernmost tip of Yidun Island Arc, namely Zhongdian Arc. In the study area, the Permian and Triassic strata are relatively developed, and the distribution strata of the mining area are mainly P3eP3ehe of the Upper Permian Emeishan basalt formation, T2b of the Miocene Beiya formation of the Triassic system and a few of the Quaternary Pleistocene series Qphe, and the new formation of QHU. It belongs to the Ming Yin stratigraphic district of Lijiang-Jinping stratigraphic zone and the Zhongzan-Shigu formation of Yangzi stratigraphic area, in which the Triassic Beiya formation is an important ore-bearing formation. The mining area is an anticline structure with an axial direction of NSE-NW, which runs through the middle of the mining area and is damaged by late faults, resulting in the anticline outcropping and incomplete. The main fault of the mine belongs to the section of Laba-Tongchang-Majiayakou fault, which passes along the back inclined axis and controls the distribution of magmatic rocks and the occurrence of porphyry molybdenum ore bodies in the mining area, and the other main fault is the F2 fault. The occurrence of skarn type copper-molybdenum deposit is controlled, and there are four secondary faults in the ore area, mainly in the near east-west direction and the NW-SE direction. Magmatic rocks are developed in the mining area. The magmatic rocks are mainly basalt, distributed in Emeishan basalt formation (P3e), and intrusive rocks are mainly distributed along F1 faults, showing small rock plants, veins and branches, etc. The lithology is mainly composed of granodiorite porphyry (纬未蟺), quartz diorite porphyrite (未 -0 渭), and the second order is phospho-porphyrite (尾渭). Among them, granodiorite porphyry, quartz diorite porphyrite are closely related to molybdenum copper deposit. The KT1 orebody mainly occurs in skarn, the industrial type of ore deposit is skarn type, and the genetic type is contact metasomatic copper-molybdenum deposit. KT11 orebody mainly occurs in granodiorite porphyry and basalt near its contact zone. The industrial type of deposit is porphyry type and the genetic type is hydrothermal type molybdenum deposit. The useful metal elements in the ore area are mainly molybdenum and copper, accompanied by a small amount of silver, and the scale of the deposit is medium molybdenum copper deposit. In this paper, the preliminary metallogenic regularity of this kind of deposit is summarized by comparing it with other Yanshanian deposits in the region through the preliminary study of space-time distribution, tectonic fissure, magmatic activity, geochemistry, geophysics and so on. According to the geophysical and geochemical results of the mining area, it can be inferred that the magnetic anomaly intensity is not high and the scale is not large, but the ore-forming geological conditions are good, and there are 1: 50 million geochemical prospecting Cu anomalies (content > 1000 脳 10 ~ (-6), which has the significance of finding copper-bearing skarn ore. Due to the magnetic anomaly, M _ 2 has a certain scale. Moreover, the 1: 50 000 geochemical Cu anomaly has reached the first order content, the west side of which is in fault contact with P3e, and the metallogenic conditions are good. It is worth further geological investigation to verify that there is a 1: 50 000 geochemical Cu anomaly (1074 脳 10 ~ (-6) in the northwest of the magnetic anomaly. The magnetic anomaly has the significance of further prospecting. If the excavation is made along the junction of the magnetic anomaly north to east and the F1 fault, there is a chance to see the ore. There are abundant structures in the mining area, and deep mineral deposits may be formed in the tectonically concentrated areas, where magmatic rocks are closely related to mineralization. The discovered KT11 is the contact site between granodiorite intrusions and Emeishan basalts in the middle of Zuzhiuping, and the limestone of Beiya formation has skarn belt near granodiorite, in view of the characteristics of skarn deposits. Mineralization may continue at this site. Combined with known engineering verification results and metallogenic rules of ore deposits, the orebodies are predicted in this paper.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.41;P618.65

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