湖南新宁回水湾锑矿床地质特征及成矿作用研究

发布时间：2018-03-04 10:15

  本文选题：矿床成因　切入点：控矿规律　出处：《长安大学》2015年硕士论文　论文类型：学位论文

【摘要】：湖南省锑矿资源十分丰富,是我国最重要的锑矿产地。近几十年来,对于锡矿山等大型锑矿床的研究较为深入,而针对中小矿床的研究较少。本文选择具有代表性的中小型回水湾锑矿床为研究对象,在大量野外工作的基础上,剖析了矿床地质特征,明确了主要的控矿构造、矿化体分布特征;结合矿床地球化学特征,探讨了成矿热液、成矿物质来源,确定了矿床类型和成矿模式。取得的主要认识有:(1)回水湾锑矿床区域上受南北向构造、北北东向、北西向及近东西向构造的复合控制,主要分布在高挂山-江口断裂的两侧。矿区内F1断裂(属高挂山—江口区域性断裂的一部分)和F2断裂是区内主要的导矿构造,它控制了回水湾锑矿带的生成与展布。(2)根据流体包裹体研究,成矿温度为224.4℃-270.0℃,属于中低温热液矿床。矿化体中的石英包裹体氢氧同位素组成表明成矿流体主要以岩浆水为主,有少量变质水混合。硫同位素特征证实成矿物质主要来源于花岗斑岩,也有少量围岩贡献。(3)回水湾锑矿床成矿机制为:第一次构造活动,岩石破碎、硅化,早阶段石英形成;第二次构造活动,石英脉和岩石再度破碎,辉锑矿伴随大量石英、白云石等沿张性和张扭性结构面充填;第三次构造活动,辉锑矿受挤压发生形变,应变重结晶生成辉锑矿微晶和碎斑在一起,亦可形成辉锑矿角砾。(4)回水湾锑矿床成因类型属于低温热液充填型矿床。
[Abstract]:Hunan Province is rich in antimony resources and is the most important source of antimony deposits in China. In recent decades, the research on large-scale antimony deposits such as Xikuang has been deeply studied. In this paper, the representative middle and small Huishuiwan antimony deposit is chosen as the research object. On the basis of a great deal of field work, the geological characteristics of the deposit are analyzed, and the main ore-controlling structures are defined. Based on the geochemical characteristics of the deposit, the ore-forming hydrothermal solution, ore-forming material source, ore deposit type and metallogenic model are determined. The main knowledge obtained is that the Huishuiwan antimony deposit area is subject to the north-south structure and the NE direction, and the ore-forming model is determined by the ore-forming type and the ore-forming model in the Huishuiwan antimony deposit area. The composite control of NW and NW trending structures is mainly distributed on both sides of the Gaozaoshan-Jiangkou fault. The F1 fault (part of the regional fault) and F2 fault in the mining area are the main ore-conducting structures in the area. It controls the formation and distribution of the Huishui Bay antimony ore belt. (2) according to the study of fluid inclusions, the ore-forming temperature is 224.4 鈩，

本文编号：1565232