投稿时间：2014-08-05
修订日期：2015-04-03
网络发布日期：2015-10-29
中文摘要:湖南瑶岗仙石英脉型钨矿床是南岭成矿带具有代表性的矿床。长期以来,对脉型钨矿床的成矿岩体特征及各种不同类型矿化的空间与演化关系一直存在争论。文章以瑶岗仙石英脉型钨矿床为研究对象,在野外地质调查的基础上,针对成矿岩体、含钨石英脉及与之相关的矿化开展地质地球化学研究工作,探讨了岩浆-热液演化过程中形成的各类矿化现象,从而建立了脉型钨矿床成矿系统。在瑶岗仙钨矿床中,成矿地质体即成矿花岗岩为碱长花岗岩,主要矿化类型包括岩浆岩型、云英岩析离体、云英岩脉、石英脉和毒砂黄玉层等,分布于岩体顶部接触带附近。成矿作用可划分为岩浆晚期阶段、岩浆热液过渡阶段、岩浆期后热液阶段,岩浆岩型矿石形成于岩浆晚期,云英岩析离体和云英岩脉等形成于岩浆-热液过渡阶段,石英脉和毒砂黄玉层主要形成于热液阶段,岩浆阶段→热液阶段的演化是连续的。成矿花岗岩侵位深度约为2～3 km,提供了主要成矿物质与成矿流体。成矿系统相对封闭,外来成矿物质和流体较少,含钨石英脉主要以快速充填的形式形成于岩浆固结之后。瑶岗仙矿床含钨石英脉控制垂深达1300 m,“五层楼”垂向分带不明显,顶部未出现细脉带和线脉带,而在石英大脉的顶部出现横向交代形成的毒砂黄玉层。研究表明,瑶岗仙矿区脉型钨矿床成矿系统保存较完整,代表系统顶部的毒砂黄玉层保存完好,剥蚀水平正好达到岩体顶部。
Abstract:The Yaogangxian quartz vein type tungsten deposit of Hunan Province is a typical deposit in the Nanling metallogenic belt. There long exists controversy over such problems as the granite, a variety of different types of mineralization and the evolution of the deposit. Based on the study of the geology and geochemistry of the ore-forming granite, veins, and other mineralization forms, the authors investigated the metallogenic evolution from magma to hydrothermal solution, and established the metallogenic system of the vein-type tungsten deposit. In the Yaogangxian deposit, the metallogenic intrusion is alkali feldspar granite, the main mineralization forms include magmatic ore, greisen inclusion, greisen veins, W-bearing quartz veins and arsenopyrite topaz layers. The mineralization mainly occurs at the top of the contact zone of the granite. Three ore forming stages were recognized: the late magmatic stage, the magma-hydrothermal transition stage and the postmagmatic hydrothermal stage. The magmatic W-Sn ore was formed at the late magmatic stage; the greisen inclusions and greisen veins were formed at the magma-hydrothermal transition stage; the quartz vein and arsenopyrite topaz were formed mainly at the postmagmatic hydrothermal stage. The mineralization continued from the late magmatic stage to the hydrothermal stage. The alkali feldspar granite was emplaced at the depth of about 2～3 km, and provided the ore-forming metals and fluid. W-bearing quartz veins were formed by rapid filling during the hydrothermal stage after magma solidification. The controlled depth of the W-bearing quartz vein in Yaogangxian deposit can be more than 1300m. Unlike "the!five floor" model, the vertical mineral zoning of the vein are not clear. There is an altered arsenopyrite topaz layer rather than a narrow quartz vein (veinlet) zone at the top of the vein system in the deposit. It is considered that the metallogenic system of the W-bearing quartz vein in the Yaogangxian deposit is well preserved, and the arsenopyrite topaz layer is the top of the system.
keywords:geology quartz-vein type tungsten deposit metallogenitic system magma-hydrothermal transition fluid genesis Hunan Province
文章编号：
中图分类号：P618.67
文献标志码：
基金项目:本文得到国家科技支撑课题(编号:2011BAB04B08)、全国危机矿山接替资源找矿项目(编号:20089927)、国土资源部公益性行业科研专项(编号:201411024-2)和中国地质调查局项目(编号:12120113086300)联合资助
引用文本：
祝新友,王艳丽,程细音,田野,傅其斌,李顺庭,于志峰.2015.湖南瑶岗仙石英脉型钨矿床成矿系统[J].矿床地质,34(5):874~894ZHU XinYou,WANG YanLi,CHENG XiYin,TIAN Ye,FU QiBin,LI ShunTing,YU ZhiFeng.2015.Metallogenic system of Yaogangxian quartz vein-type tungsten deposit, Hunan Province[J].Mineral Deposits34(5):874~894
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