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1、文章編號:1004—5589(2008)03—0252—08內(nèi)蒙拜仁達(dá)壩銀鉛鋅多金屬礦床地質(zhì)特征王力,孫豐月吉林大學(xué)地球科學(xué)學(xué)院,長春130061摘要:經(jīng)詳細(xì)的光、薄片鑒定和電子探針分析,認(rèn)為該礦床礦石組成比較復(fù)雜,主要為磁黃鐵礦、方鉛礦、鐵閃鋅礦、毒砂、黃鐵礦、銀黝銅礦和黃銅礦等,其次還有閃鋅礦、輝銀礦、自然銀、黝錫礦、硫銻鉛礦、膠狀黃鐵礦、鉛礬、褐鐵礦和孔雀石等。其中銀黝銅礦,黝錫礦和硫銻鉛礦是本次工作新鑒定出的礦物。結(jié)合成礦地質(zhì)特征、礦物共生組合特點(diǎn)和礦物間的穿插關(guān)系,將該礦床的成礦作用劃分為熱液成礦期和表生氧化期。熱液期又可劃分出4個成礦階段:Ⅰ1毒砂2黃鐵礦2石英階段,該階段礦化
2、較弱;Ⅱ1石英2閃鋅礦2磁黃鐵礦階段,該階段礦化范圍大,強(qiáng)度大,是鋅的主成礦階段,并伴隨少量的銀礦化;Ⅲ1銀多金屬硫化物階段,該階段是該區(qū)最重要的銀鉛鋅成礦階段;Ⅳ1碳酸鹽2螢石2玉髓階段,該階段在礦區(qū)內(nèi)分布廣泛,礦化不發(fā)育,屬成礦的尾聲。結(jié)合測溫研究確定該礦床是受斷裂構(gòu)造控制的中溫?zé)嵋旱V床。關(guān)鍵詞:內(nèi)蒙;拜仁達(dá)壩;礦物組成;成礦期次中圖分類號:P61814文獻(xiàn)標(biāo)識碼:AGeologicalcharacteristicsofBairendabaAg2Pb2ZnpolymetallicoredepositinInnerMongoliaWANGLi,SUNFeng2yueCollegeofEa
3、rthSciences,JilinUniversity,Changchun130061,ChinaAbstract:Basedonthemicroscopicstudyontransparentandpolishedthinsectionsandelectronicprobeanal2ysisfordifferentminerals,ithasbeenrealizedthatthemainoremineralassemblagesconsistofpyrrhotite,galena,marmatite,arsenopyrite,pyrite,freibergite,chalcopyrite
4、withminoramountofsphalerite,argentite,nativesilver,stannine,boulangerite,colloformpyrite,anglesite,limonite,malachite,etc.Amongthem,freibergite,stannine,boulangeritearefirstdiscoveredinthisoredistrictbytheauthors.Combinedwithore2formingcharacteristics,min2eralassemblages,andmineralcrosscutting,two
5、mineralizingperiods,i1e.hydrothermalandsupergeneones,areidentified.Therearefourmineralizingstagesinthehydrothermalperiod,includingⅠ.arsenopyrite2pyrite2quartzstagethatisofminorsignificanceformineralization;Ⅱ.quartz2spheralite2pyrrhotitestagethatisextensivelydevel2opedandisanimportantstageforzincwi
6、thminorsilver;Ⅲ.silver2polymetallicmineralstagethatismostimpor2tantepochforsilver,lead,andzinc;Ⅳ.carbonate2fluorite2chalcedonystage,representingtheendofthehydro2thermalactivity,whichiswidelydistributedintheoredistrictwithminorindustrialsignificance.ItissuggestedthatBairendabaAg2Pb2Znpolymetallicor
7、edepositbelongstomesothermaldepositcontrolledbyfractures.Keywords:InnerMongolia;Bairendaba;mineralassemblage;mineralizingperiodandstage收稿日期:2008201225;改回日期:2008206225基金項目:全國危機(jī)礦山接替資源找礦項目(200623018)第3期王力孫豐月:內(nèi)蒙拜仁達(dá)壩銀
