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1、2009年6月岩矿测试Vo.l28,No.3June2009ROCKANDMINERALANALYSIS283~287文章编号:02545357(2009)03028305吉林福安堡钼矿中辉钼矿铼-锇同位素定年及成矿作用探讨12113222李立兴,松权衡,王登红,王成辉,屈文俊,汪志刚,毕守业,于城(1.中国地质科学院矿产资源研究所,北京100037;2.吉林省地质调查院,吉林长春130061;3.国家地质实验测试中心,北京100037)摘要:福安堡钼矿是吉林中部地区近年来新发现的一个中型规模斑岩型钼矿,成矿地质特征与同一成矿带内的大黑山超大型钼矿相似,其深部找矿
2、前景良好。文章首次对福安堡钼矿中5件辉钼矿样品进行铼-锇同位素测定,分析结果表明,辉钼矿中铼含量为9.94~15.12Lg/g,模式年龄为(165.3?2.4)Ma~(167.0?2.3)Ma,平均模式年龄为(166?1)Ma;等时线年龄为(166.9?6.7)Ma,其加权平均方差(MSWD)为0.60,属燕山早期成矿。成矿物质主要为壳源,但混有少量的幔源组分。燕山早期由于古太平洋板块的俯冲作用,含矿似斑状二长花岗岩侵位于北东向和北西向断裂的交汇部位,成矿物质在岩浆期后聚集形成了福安堡钼矿。燕山早期为吉黑成矿省吉中)延边(活动陆缘)成矿带钼矿的主要成矿期。加强对该
3、地区燕山早期岩浆作用的研究,有助于地质找矿取得新的突破。关键词:福安堡钼矿;斑岩型;辉钼矿;铼-锇同位素定年;燕山早期;吉中)延边成矿带中图分类号:P579.3;P578.291文献标识码:ARe-OsIsotopicDatingofMolybdenitefromtheFucanpuMolybdenumDepositofJilinProvinceandDiscussiononItsMetallogenesis1211LILi-xing,SONGQuan-heng,WANGDeng-hong,WANGCheng-hui,3222QUWen-jun,WANGZhi-g
4、ang,BIShou-ye,YUCheng(1.InstituteofMineralResources,ChineseAcademyofGeologicalSciences,Beijing100037,China;2.GeologicalSurveyofJilinProvince,Changchun130061,China;3.NationalResearchCenterforGeoanalysis,Beijing100037,China)Abstract:TheFucanpumolybdenumdepositisanewlydiscoveredmedium-sc
5、aleporphyrymolybdenumdepositincentralJilinProvinceandhasgreatpotentialindeepprospecting.ApreciseRe-OsisotopicdatingforfivemolybdenitesamplesfromtheFucanpumolybdenumdepositwascarriedou.tTheRecontentinthesamplesvariedfrom9.94Lg/gto15.12Lg/gandthemodelageofthemolybdenitefrom(165.3?2.4)Ma
6、to(167.0?2.3)Mawiththeaveragemodelageof(166?1)Maandtheisochronageof(166.9?6.7)Ma,MSWD=0.60.TheresultsindicatethatthemineralizationintheFucanpumolybdenumdeposittookplaceattheEarlyYanshanianperiod.ThecomparativelylowRecontentshowsthatore-formingmaterialsmainlycamefromacrustalsource.Beca
7、useofthemovementofPalaeo-PacficPlateintheEarlyYanshanianperiod,ore-bearinggranitesinvadedintheintersectionregionsoftheNEandNWdirectionfaults,andtheoreformedatpostmagmaticstage.TheEarlyYanshanianperiodisthemajormetallogenicepochoftheJizhong-YanbianmetallogenicbeltoftheJilin-Heilongjian
8、gmeta
