西藏斯弄多浅成低温热液型银铅锌矿床银的赋存状态研究

发布时间：2018-06-24 03:10

  本文选题：赋存状态 + 银矿物　； 参考：《地球学报》2017年05期

【摘要】：斯弄多银铅锌矿床是冈底斯成矿带林子宗群火山岩中发现的首例低硫化型浅成低温热液型中-大型多金属矿床。矿区矿物组合多样,矿石组构复杂,具有热液成矿作用的典型特征,成矿阶段可划分为(I)闪锌矿-黄铜矿-硫砷铜矿-黄铁矿-石英阶段、(Ⅱ)方铅矿-闪锌矿-银矿物阶段、(Ⅲ)黄铁矿-石英-方解石三个成矿阶段。通过野外调查、地质编录、显微观察和电子探针(EPMA)微区分析,本文对该矿床中银的赋存状态进行了详细的研究。结果表明,银主要以独立银矿物形式存在,方铅矿、闪锌矿、黄铁矿、黄铜矿等金属矿物中不可见银极少。银矿物种类主要为硫砷铜银矿、辉银矿、深红银矿、螺状硫银矿和自然银,呈裂隙银或粒间银形式赋存于矿区碧玉、铁锰碳酸盐和早期金属硫化物中,次以包裹银形式赋存于早期硫化物中。另,在硫砷铜矿中发育极少的类质同象不可见银。银矿化主要形成于成矿阶段Ⅱ,银主要以硫的络合物形式运移,随着成矿流体物理化学条件的变化而发生沉淀,形成银矿物。
[Abstract]:The Sillondo silver lead-zinc deposit is the first low-sulfide epithermal meso-large polymetallic deposit found in the volcanic rocks of the Linzizong group in the Gangdis metallogenic belt. The mineral assemblage is diverse, the mineral fabric is complex, and it has the typical characteristics of hydrothermal mineralization. The metallogenic stage can be divided into (I) sphalerite-chalcopyrite-pyrite-quartz stage, (II) galena-sphalerite-silver mineral stage, (III) pyrite-quartz-calcite metallogenic stage. Through field investigation, geological cataloguing, microscopic observation and EPMA microanalysis, the occurrence of silver in the deposit is studied in detail in this paper. The results show that silver mainly exists in the form of independent silver minerals, and there is little silver in galena, sphalerite, pyrite, chalcopyrite and other metal minerals. The main types of silver minerals are sulfur, arsenic, copper and silver, pyroxene, crimson silver, snail silver and natural silver, occurring in the form of fissured silver or intergranular silver in the form of Jasper, ferromanganese carbonate and early metallic sulfides. It occurs in early sulfides in the form of wrapped silver. In addition, silver is invisible in the development of very few homologues in the sulfur-arsenic copper deposit. Silver mineralization mainly takes place in the metallogenic stage 鈪，

本文编号：2059732