| 冀西北相广锰银矿床地质特征及成因初探 |
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| 引用本文： | 徐国梁.冀西北相广锰银矿床地质特征及成因初探[J].化工矿产地质,1993(1). |
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| 作者姓名： | 徐国梁 |
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| 作者单位： | 河北省地质矿产局第三地质大队 |
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| 摘 要： | 相广锰银矿床具有大陆边缘型火山岩、次火山岩银矿床的典型特征,锰-银为该矿床的稳定地球化学组合。矿体的形成受一组北西-北北西向扭性裂隙控制,矿石分锰银矿石与蚀变岩银矿石两种类型。前者中的银主要呈分散状态分布于锰矿物中,次为独立银矿物;后者中银以独立银矿物为主,次为分散银。银主要来源于火山岩、次火山岩,在内生阶段形成而又在表生阶段富集。属燕山期陆相次火山热液型矿床。
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| 关 键 词： | 锰银矿床 地质特征 次火山热液型 冀西北相广 |
ON GEOLOGY AND GENESIS OF XIANGGUANG Mn-Ag DEPOSIT IN THE NORTHWESTERN HEBEI PROVINCE |
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| Abstract: | Xiangguang Mn-Ag deposit in Zhuolu County,hebei,is typically related tovolcanics and subvolcanics along continental margin,with geochemically stable Mn-Ag mineral assemblage.Spatial occurrences of the ore bodies are essentiallycontrolled by a NW-NNW trending shear zone.The ore types include Mn-Ag oreand alternated rock-hosted Ag ore.The principal Ag-containing minerals,argentite-acanthite,native silver,silver-sulphide,iodoromite,ete.are 89.52% dispersed and10.48% independent,both carried by mangan minerals within one ore type.Theother ore type maintains 63.68% independent silver minerals and 36.32% dispersedones,by carrying of jarosite-limonite.Ore-forming materials,mongan and siliver,were derived mostly fromvolcanics and subvolcanics.Endogenic process made them precipitate up to highermineralization level and then,towards hypergenic phase,they were enriched up,probably associated with alternation of mangan minerals,jarosite-limonite andkaolin.It is casily concluded from the above idea that the deposit should be catalagedunder a volocano-hydrothermal mode in relation to continental subvolcanic activitiesof Yanshanian epoch. |
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