河南省枪马金矿成矿作用与成矿预测

发布时间：2018-02-10 21:58

  本文关键词： 围岩蚀变 地球化学 矿床成因 成矿预测 枪马金矿　出处：《中国地质大学(北京)》2017年硕士论文　论文类型：学位论文

【摘要】：枪马金矿是小秦岭地区一个代表性的大型石英脉型金矿。本文对枪马金矿开展了矿床地质、矿床地球化学及同位素地球化学研究,在此基础上分析了围岩蚀变与金成矿的关系,探讨了枪马金矿的成因,总结了成矿规律,开展了成矿预测。枪马金矿主矿体为石英黄铁矿脉,且空间上具有波状起伏、尖灭再现的特征。构造控矿作用显著,厚大矿体多赋存在倾向倾角转折部位。枪马金矿矿体两侧普遍发育围岩蚀变且空间上具有明显分带特征。自矿体向外依次发育黄铁绢英岩化蚀变、硅化蚀变、碱性交代蚀变、绿泥绿帘石化蚀变和新鲜斜长角闪岩。以黄铁绢英岩化蚀变和碱性交代蚀变与矿体关系最为密切。Isocon图解法质量平衡计算结果表明,早期碱性交代蚀变使围岩中的Au、Cu、Pb、Zn等元素发生活化进入流体;硅化蚀变过程中流体与围岩间元素交换缓慢;而黄铁绢英岩化蚀变过程中发生强烈的硫化反应,破坏了金络合物的平衡,导致金的大量沉淀;绿泥绿帘石化蚀变为成矿晚期的低温蚀变,标志着成矿作用的基本结束。矿石的微量和稀土元素配分模式与碱性交代和黄铁绢英岩化蚀变岩相似,表明其可能具有相似的成矿物质来源。铅同位素测试结果表明,成矿物质主要来自太华群变质岩。综合分析表明,构造对矿体就位有重要的控制作用,碱性交代和黄铁绢英岩化蚀变作用是导致金活化和沉淀的重要因素,这两种蚀变也是重要的找矿标志。预测59号勘探线南侧深部具有良好的找矿潜力
[Abstract]:Guanma gold deposit is a representative large quartz vein type gold deposit in Xiaoqinling area. Ore deposit geology, deposit geochemistry and isotopic geochemistry have been studied in this paper. On this basis, the relationship between wall rock alteration and gold mineralization has been analyzed. In this paper, the origin of Guanma gold deposit is discussed, the metallogenic regularity is summarized, and metallogenic prediction is carried out. The main orebody of Qianma gold deposit is quartz pyrite vein, which has the characteristics of wave fluctuation and sharp out reappearance in space. The thick and large ore bodies mainly occur in the inclined angle turning position. The wall rock alteration is generally developed on both sides of the Gangma gold deposit and has obvious zonation characteristics in space. From the ore body out, the alteration of the pyrolite, the silicification and the alkaline metasomatism are developed in turn. Green mud and green curtain alteration and fresh oblique amphibolite. The results of mass balance calculation show that the alteration of yellow sericite and alkaline metasomatism is most closely related to the orebody. In the early alkaline metasomatic alteration, the elements such as Au-CuCuPb-Zn in the surrounding rock were activated into the fluid, the exchange of elements between the fluid and the surrounding rock was slow during the silication alteration, and the strong vulcanization reaction took place in the alteration process of the yellowsericite. The balance of gold complex is destroyed and a large amount of gold is precipitated. The alteration of green mud and green curtain turns into low temperature alteration in late metallogenic period. The trace and rare earth element distribution patterns of ore are similar to alkaline metasomatism and yellow sericite altered rocks, indicating that they may have similar metallogenic sources. The metallogenic material mainly comes from the metamorphic rocks of Taihua Group. The comprehensive analysis shows that the structure plays an important role in controlling the position of the orebody, and the alkaline metasomatism and the alteration of the Huangtianshinite are the important factors leading to the activation and precipitation of gold. These two kinds of alteration are also important indicators for prospecting. It is predicted that the south depth of Prospecting Line 59 has good prospecting potential.
【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】：2017
【分类号】：P618.51
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本文编号：1501532