本文選題：賦存狀態(tài) + 銀礦物��； 參考：《地球?qū)W報》2017年05期

【摘要】：斯弄多銀鉛鋅礦床是岡底斯成礦帶林子宗群火山巖中發(fā)現(xiàn)的首例低硫化型淺成低溫?zé)嵋盒椭?大型多金屬礦床。礦區(qū)礦物組合多樣,礦石組構(gòu)復(fù)雜,具有熱液成礦作用的典型特征,成礦階段可劃分為(I)閃鋅礦-黃銅礦-硫砷銅礦-黃鐵礦-石英階段、(Ⅱ)方鉛礦-閃鋅礦-銀礦物階段、(Ⅲ)黃鐵礦-石英-方解石三個成礦階段。通過野外調(diào)查、地質(zhì)編錄、顯微觀察和電子探針(EPMA)微區(qū)分析,本文對該礦床中銀的賦存狀態(tài)進(jìn)行了詳細(xì)的研究。結(jié)果表明,銀主要以獨(dú)立銀礦物形式存在,方鉛礦、閃鋅礦、黃鐵礦、黃銅礦等金屬礦物中不可見銀極少。銀礦物種類主要為硫砷銅銀礦、輝銀礦、深紅銀礦、螺狀硫銀礦和自然銀,呈裂隙銀或粒間銀形式賦存于礦區(qū)碧玉、鐵錳碳酸鹽和早期金屬硫化物中,次以包裹銀形式賦存于早期硫化物中。另,在硫砷銅礦中發(fā)育極少的類質(zhì)同象不可見銀。銀礦化主要形成于成礦階段Ⅱ,銀主要以硫的絡(luò)合物形式運(yùn)移,隨著成礦流體物理化學(xué)條件的變化而發(fā)生沉淀,形成銀礦物。
[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，

本文編號：2059732