江西德兴铜厂斑岩铜矿床蚀变及微量元素特征

发布时间：2018-05-14 22:30

本文选题：斑岩铜矿 + 德兴铜厂　；参考：《中国地质大学(北京)》2015年硕士论文

【摘要】：德兴斑岩铜矿是亚洲最大的露天开采铜矿床,铜厂矿区是德兴斑岩铜矿最大的矿区。研究区位于扬子板块东部,江南台隆与赣--杭裂陷带的衔接部位,区内震旦系双桥山群发育最广泛,矿田主要赋存在九都组,区内岩浆活动强烈,与成矿有关的主要是燕山期的花岗闪长斑岩、石英闪长玢岩。矿体主要赋存在岩体和围岩的接触带中强蚀变带内,其中在赋存围岩2/3。矿石矿物主要为金属硫化物,如黄铁矿、黄铜矿、辉钼矿、砷黝铜矿、斑铜矿等。脉石矿物有石英、硅酸盐矿物、碳酸盐矿物、硫酸盐矿物、绿帘石、钾长石等。矿区蚀变强烈,结合野外观察、薄片镜下鉴定、PIMA应用,可将矿区分六个蚀变带:岩体内分三个带,钾长石-伊利石化带、绿泥石-绢云母化带、石英绢云母化带;围岩内蚀变分三个带:石英-绢云母化带、绿泥石-绢云母化带、绿泥石-伊利石化带。PIMA数据平面模型,结合岩石微量元素含量分析发现:反射率、强度比大的地区,铜Cu含量比较低,反射率、强度比比较小地方,Cu含量比较高,区域元素平均含量与反射率、强度比成反比。微量元素R型聚类分析研究发现与成矿有关的成矿元素组合Pb-Bi-Cd-Sb-Zn-Cu-Au-Ag,通过R型因子分析发现主成矿因子为Cu-Au。稀土元素(REE)各蚀变带球粒陨石标准化配分曲线右倾,轻稀土元素富集。稀土元素在各蚀变带含量变化较大。以热液为联接点,岩体和围岩作为一个统一的系统,在蚀变矿化过程中,岩体围岩REE具有互补性。ΣREE平均含量随着Cu矿化的增强,含量也增加,与Cu矿化正相关。德兴铜矿铜厂矿区除主要的成矿元素Cu、Mo外,其伴生元素Au、Ag、Re、Co等元素也具有非常大的经济价值。Au、Ag主要以独立矿物产出,自然金占90%以上;Re主要赋存辉钼矿中;Co主要赋存黄铁矿中。Au、Ag、Re、Co在线上分布不均匀,但有一定对称性。Ag分布与蚀变的强弱没有特别大的关系,自岩体向外岩石中平均含量逐渐降低;Co在蚀变较弱的千枚岩绿泥石—绢云母化带(H2)含量较高,其他蚀变带含量较低;Au、Re、Mo、Cu岩石中平均含量高的区域在主要岩体和围岩的接触地带,这些地区蚀变比较强烈。Au、Ag、Re、Co具有亲硫性,能在热液中以络合离子形式运移,热液物理化学条件改变后富集沉淀成矿。
[Abstract]:Dexing porphyry copper deposit is the largest opencast copper deposit in Asia and Tongchang mine is the largest in Dexing porphyry copper mine. The study area is located in the eastern part of the Yangtze plate and the junction between Tailong in Jiangnan and Gan-Hangzhou rift belt. The Shuangqiao Mountain Group of Sinian system is the most widely developed in this area. The ore field is mainly located in the Jiudu formation, and the magmatic activity in the area is strong. Related to mineralization are the Yanshanian granodiorite and quartz diorite porphyrite. The orebody mainly occurs in the strong alteration zone of the contact zone between the rock mass and the surrounding rock, in which 2 / 3 of the surrounding rock exists. Ore minerals are mainly metal sulfides, such as pyrite, chalcopyrite, molybdenum, arsenic tetrahedrite, placerite and so on. Gangue minerals have quartz, silicate minerals, carbonate minerals, sulfate minerals, verdant, potassium feldspar and so on. In combination with field observation, the application of PIMA can be divided into six alteration zones: three zones in rock body, three zones in potassium feldspar and Illite zone, one in chlorite and sericite zone, and the other in quartz sericite zone. The inner alteration of surrounding rock is divided into three zones: quartz sericite zone, chlorite Illite belt. Pima data plane model, combining with the analysis of trace element content of rock, it is found that the area with large reflectivity and strength ratio, The Cu content is relatively low, the reflectivity and intensity ratio are low, and the average content of regional elements is inversely proportional to the reflectivity and intensity ratio. It is found that the metallogenic element combination Pb-Bi-Cd-Sb-Zn-Cu-Au-Agis related to metallogenic elements, and the main metallogenic factor is Cu-Authrough R-type factor analysis. REE) the normalized partitioning curves of the altered chondrites are rightward and light rare earth elements are enriched. The content of rare earth elements varies greatly in each alteration zone. Taking hydrothermal solution as the connecting point and rock mass and surrounding rock as a unified system, the REE of rock mass is complementary in the process of alteration and mineralization. 危 REE average content increases with the increase of Cu mineralization, which is positively related to Cu mineralization. In addition to the main ore-forming element Cu-Mo, the associated elements, such as Au-Ag-Re-Co, are also of great economic value in the copper mining area of Dexing Copper Mine, which are mainly produced as independent minerals. Natural gold accounts for more than 90% of the main molybdenum deposits. The distribution of Co in pyrite is not uniform on line, but there is no significant relationship between the distribution of symmetry and the degree of alteration. The average content of Co in phyllite with weak alteration is higher than that in other altered zones, and the contact zone between main rock mass and surrounding rock is where the average content in other alteration zones is lower than that in Au-ReMo-Mo-Cu rocks, which decreases gradually from the outward rock mass to the average content of Co in phyllite with relatively weak alteration, and the content of other alteration zones is lower than that of other altered zones, where the average content of the rocks is higher than that of other altered zones. The alteration in these areas is very strong. The Ag-ReCo is sulfurophilic and can be transported in the form of complex ions in hydrothermal solution. The hydrothermal physical and chemical conditions are changed to enrich and precipitate the ore.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.41

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