晶质石墨矿鳞片片径与成矿特征分析

Analysis of the Scale Size and Metallogenic Characteristics of Crystalline Graphite Ore

晶质石墨鳞片大小与成矿地质背景、矿石类型密切相关,本文在实地调研、综合研究的基础上,分析了不同成矿区带石墨鳞片特征。研究表明:大鳞片石墨矿主要分布于华北陆块北缘中段、佳木斯—兴凯地块南部、胶北隆起、华北陆块南缘—秦岭及黄隆断宆石墨成矿带;大鳞片石墨矿石类型主要为石墨片麻岩、片岩、变粒岩、大理岩型矿石。形成时代早(新太古代至元古代),变质程度高,一般达到角闪岩相至麻粒岩相。中小鳞片主要分布在扬子陆块、新华夏古陆、佳木斯—兴凯地块北部、华北陆块北缘中段、准噶尔地块等,主要形成于中元古代至寒武纪,少量形成于石炭纪。矿石类型以石墨片岩、石墨石英岩为主,变质相一般为绿片岩相、角闪岩相。

The size of crystalline graphite scales is closely related to the geological background and ore type of mineralization.This article is based on on-site research and comprehensive research.Analyzed the characteristics of graphite scales in different mineralization zones.Research has shown that:Large scale graphite deposits are mainly located in the middle of the northern margin of the North China Craton,Southern part of Jiamusi Xingkai plot,Jiaobei Uplift,South margin of North China Craton-Qinling Mountains,Huanglong fault type graphite mineralization belt.Large scale graphite ore is mainly graphite Gneiss,Schist,granulite,marble type ore.The earlier the formation age(Neoarchean to Proterozoic),the higher the degree of deterioration,the larger the crystal,the metamorphic degree generally reaches hornblende facies to granulite facies.Small and medium-sized scales are mainly distributed in the Yangtze landmass,New Huaxia Ancient Land,North of Jiamusi Xingkai Block,Middle section of the northern margin of the North China landmass,Junggar Block,etc.Small and medium-sized scales were mainly formed from Mesoproterozoic to Cambrian.A small amount was formed in Carboniferous.The ore types are mainly graphite schist and graphite quartz,the metamorphic facies are generally greenschist and amphibolite facies.