中文摘要：

西藏多龙矿集区铁格隆南铜（金-银）矿床是西藏第一例得到确认的浅成低温热液矿床。矿床中黄铁矿发育广泛且特征明显,矿区钻孔浅部内的黄铁矿发育环带状结构,这在其他类型铜矿床中较少见。本文通过系统的野外钻孔地质编录、镜下鉴定和电子探针分析等对矿区广泛发育的黄铁矿进行了矿物学特征、微量元素及特有的环带状结构进行了系统的研究,并解释环带状黄铁矿的成因及其地质意义。结果表明：铁格隆南矿床内黄铁矿的环带为生长不连续形成的。环带状黄铁矿的环带从核部到边缘,其Co/Ni比值,Au、Cu和Se等元素含量呈现出一定的韵律变化,形成外部环带时流体的温度依次增高且均高于矿物内部环带形成时的温度,并且外部环带形成时流体内Au、Cu和Se元素的含量高于内部环带形成时流体内含量。环带状黄铁矿内的Au是以Au^＋替换Fe^2＋的形式进入黄铁矿晶格,而Cu一部分以Cu^2＋置换Fe^2＋形成Cu S2形式存在,一部分以含铜硫化物包体的形式存在。矿区环带状黄铁矿多数发育在矿体浅部,接近铜矿化强烈的位置,且该位置Au、Ag和Cu元素的品位均较高。因此,环带状黄铁矿可以作为铁格隆南矿区Au、Ag和Cu元素开始富集的指示标志。

英文摘要：

Tiegelongnan copper（gold-silver） deposit in Duolong ore-concentrated area is the first discovered epithermal deposits in Tibet, China. Pyrites in deposit develops extensively with obvious characteristics. Pyrites which are located in shallower parts of drillings develop band structure and they are relative rarity in other deposits. This paper studies the mineralogical characteristics, trace elements and unique band structure of pyrites in the ore area by using field drilling geological record, microscopic identification, electron microprobe analysis and so on. At the same time, the paper explains the origin of banded pyrites and the geological implications of banded pyrites. Result show that banded pyrites in Tiegelongnan ore area is the result of discontinuous growth. The Co/Ni and element contents of Au, Cu and Se show rhythm changes from core to edge of banded pyrite. Temperature of fluid during formation of the external band is higher than that of formation of the internal band. Contents of Au, Cu and Se in the liquid during formation of the external band are higher than those during of the internal band. Au in the banded pyrite gets into pyrite crystal lattice via Au^＋ replacing Fe^2＋. While part of Cu gets into pyrite crystal lattice via Cu^2＋ replacing Fe^2＋ to form Cu S2 and part of Cu gets into pyrite via copper sulfide inclusions. The banded pyrite developed in the shallow of orebody, which is approach to the strong copper mineralization and Au, Ag and Cu grades in the position that banded pyrite developed are high. Therefore, the banded pyrite is the indication for concentrating Au, Ag and Cu elements in Tiegelongnan ore area.