元古宙爆破角砾岩型店坊金矿  

DIANFANG GOLD DEPOSIT IN AN EXPLOSIVE BRECCIA CHIMNEY OF PROTEROZOIC, HENAN PROVINCE

作　　者：赵嘉农[1] 任富根[1] 丁士应[1] 李增慧[1] 

机构地区：[1]地矿部天津地质矿产研究所,天津300170

出　　处：《前寒武纪研究进展》1998年第1期1-10,共10页Progress in Precambrian Research

基　　金："八五"国家重点黄金!科技攻关项目;90051-63-l

摘　　要：店坊金矿产在中元古代熊耳群爆破角砾岩体的南部，与马超营断裂带东延部分有关。其以金伴生铝矿化为特征，表现为矿化角砾岩、矿化复成分角砾岩。矿石组分主要是黄铁矿，方铅矿、自然金、银金矿，Ag／Au较高。特征的蚀变矿物为锰铝榴石、阳起石、方解石。成矿条件为中～高温（220℃～438℃）、高硫逸度（lgfs2=-39．85～－19．37）、低氧逸度（lgfo2＜-37）、偏碱性（PH＞7）环境。硫铅同位素组成特征与围岩相似，标志来源相同。该矿是元古宙熊耳期中心式火山喷发过程中岩浆残余液体发生矿化作用形成的爆破角砾岩型金矿。Dianfang gold deposit is located at the east part of the Machaoying fault zone, andhosting in the south contact of an explosive breccia chimney, Xionger Group. It ischaracteristically enriched in Au asscoiating with Pb, and occurs in mineralizing breccia andpolymetal - bearing berccia. The ore metal minerals are mainly Pyrite, galena, native gold andelectrum .The silver /gold ratio is high. The typical alteration minerals are partschinite,actinolite and calcite. Gold deposition was developed under the conditions of medium to hightemprature(200℃～438℃ ), slight alkalinity (PH>7) with lgfs2 = - 39. 85～ - 19. 37 and lgfo2< - 33. The S and Pb isotope compositions of ore are similar to that of wall rock, reflecting bothof them hav the same original sources. Gold mineralization linked with residual magmatic fluidevolved from central - vent volcanic eruption during the Xionger tectonic event.

关 键 词：元古宙 爆破角砾岩型 成矿时代 金矿床 

分 类 号：P618.510.2[天文地球—矿床学]