四川会理大铜矿构造控矿因素与找矿前景
发布时间：2018-05-02 12:12
本文选题：铜矿床 + 矿床成因 ； 参考：《成都理工大学》2015年硕士论文
【摘要】：会理大铜矿铜矿床是四川省重要的中型铜矿床之一,它位于川滇南北向构造带中段与南岭东西向构造带西延交接部位,处于康滇地轴中生代断陷盆地—会理盆地的南西侧。本文通过对大铜矿铜矿床区域地质背景、矿床地质特征等的地质资料收集、整理和野外实地地质调查等工作,并结合该铜矿床地球化学特征的研究,对大铜矿铜矿床的矿床成因有了进一步认识。会理大铜矿铜矿床产于中生代晚白垩世小坝组地层中,小坝组地层岩性为一套河湖相紫红色碎屑沉积岩。矿区主要褶皱构造为青蛙甲背斜和向斜。矿体呈层状、似层状产出,产状与围岩基本一致。矿石主要原生金属矿物为辉铜矿和斑铜矿,次生矿物主要为孔雀石等。矿石结构构造比较简单,主要为结晶粒状及溶蚀结构和侵染状胶结构造。矿体围岩无明显蚀变现象。通过对该矿床地球化学特征研究表明,含矿围岩与矿体在常量元素、微量元素、稀土元素的组合上,具有相似的配分特征,显示它们具同源性,成矿物质主要来源于地层建造。矿石铅同位素组成反映其物质来源主要为壳源,而矿石硫同位素δ34S值为-13.3‰~㧏2.8‰,反映硫主要来自沉积物中的硫酸盐细菌还原作用和部分生物有机硫。流体包裹体研究表明低温低压条件下的成矿特征。除此之外,本文通过对该铜矿床成因的研究,还对大铜矿铜矿床的沉积相和成矿模式做了简要分析。本文认为该铜矿床是属于河流沉积相沉积,古河道凸岸的滨河床浅滩与成矿作用密切相关。铜元素的富集成矿作用主要发生在成岩中期—晚期。成矿环境为氧化向还原的过度环境。成矿期大体经历了沉积阶段、构造运动阶段和构造运动相对稳定阶段三个时期。成矿物质在后期的成岩作用过程中再度活化、转移、富集而成。综合研究显示,大铜矿铜矿床为一沉积砂砾岩型层控铜矿床。最后,本文根据对大铜矿矿床成因的认识,对大铜矿铜矿床的远景找矿指出方向。
[Abstract]:The Huili large copper deposit is one of the most important medium copper deposits in Sichuan Province. It is located at the junction of the middle segment of the southwestern Sichuan-Yunnan trending structural belt and the east-west trending structural belt of Nanling, and is located in the west of the Mesozoic fault-Huili basin on the Kangdian axis. In this paper, the regional geological background and geological characteristics of the copper deposit in Dayu copper deposit are collected, sorted out and investigated in the field, and the geochemical characteristics of the deposit are studied. A further understanding of the genesis of the copper deposit in Dayu copper deposit has been made. The large copper deposit of Huili copper deposit occurred in the late Cretaceous Xiaoba formation of Mesozoic. The lithology of Xiaoba formation is a set of fluvial and lacustrine purplish red clastic sedimentary rocks. The main fold structures in the mining area are frog armour anticline and syncline. The orebody is stratiform, similar to stratiform, and its occurrence is basically the same as that of surrounding rock. The main primary metallic minerals are chalcopyrite and porphyrite, while the secondary minerals are malachite. Ore structure is relatively simple, mainly crystalline granular and dissolution structure and infective cementation structure. There is no obvious alteration phenomenon in the surrounding rock of ore body. By studying the geochemical characteristics of the deposit, it is shown that the ore-bearing surrounding rock and orebody have similar partition characteristics in the combination of major elements, trace elements and rare earth elements, indicating that they are homologous, and the ore-forming materials are mainly derived from stratigraphic formations. The lead isotopic composition of ore shows that its material source is mainly from shell source, while the 未 34 S value of ore sulfur isotope is -13.3 鈥，
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