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时间:2020-03-26
《赣中下桐岭钨矿辉钼矿Re—Os年龄及其地质意义.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、2011年12月矿床地质第30卷第6期December,2011MINERALDEPOSITSVo1.30No.6文章编号:0258—7106(2011)06—1075—10赣中下桐岭钨矿辉钼矿Re—Os年龄及其地质意义李光来,一,华仁民,黄小娥2,韦星林2,屈文俊3,王旭东,4(1南京大学内生金属矿床成矿机制研究国家重点实验室,江苏南京210093;2东华理工大学核资源与环境省部共建国家重点实验室培训基地,江西南昌330013;3江西有色地质勘查局,江西南昌330001;4国家地质实验测试中心,北京100037)摘要下桐岭钨多金属矿床位于赣中武功山
2、地区分宜县,以花岗岩体内外的网脉型钨钼铋矿化为主,同时发育少量大脉型矿体。文章通过对该矿床成矿期形成的6件辉钼矿样品进行Re-Os同位素定年,获得其等时线年龄为(152.0±3.3)Ma(MSWD=2.4),模式年龄加权平均值为(150.6±1.3)Ma(MSWD=1.4),二者在误差范围内一致。这一年龄与南岭地区钨成矿的爆发期一致,表明下桐岭钨矿是燕山中期华南大规模钨成矿作用的产物。与南岭东段大多数石英脉型钨矿相比,下桐岭钨矿的辉钼矿具有较高的Re含量,暗示其受到较多壳一幔相互作用的影响,这可能与它处在“钦杭成矿带”赣中段、邻近萍乡一广丰深大断裂有
3、一定关系。关键词地球化学;下桐岭钨矿;网脉型钨钼铋矿;Re—Os同位素;OR杭成矿带中图分类号:P618.67文献标志码:ARe—OsisotopicageofmolybdenitefromXiatonglingtungstendeposit,centralJiangxiProvince,anditsgeologicalimplicationsLIGuangLai一,HUARenMin,HUANGXiaoE2,WEIXingLin2,QUWenJun3andWANGXuDong,(1StateKeyLaboratoryforMineralDeposi
4、tsResearch,NanjingUniversity,NaNing210093,Jiangsu,China;2StateKeyLaboratoryBreedingBaseofNuclearResourcesandEnvironment,EastChinaInstituteofTechnology,Nanchang330013,Jiangxi,China3JiangxiBureauofNonferrousMetalExploration,Nanchang330001,Jiangra,China;4NationalResearchCenterofGe
5、oanalysis,CAGS,Beijing100037,China)AbstractTheXiatonglingtungstendeposit,locatedinthecentralpartofJiangxiProvince,ischaracterizedbystock—worktypeW—Mo—Bimineralizationtogetherwithasmallamountofwolframite—quartz—veinore.Inthisstudy,sixmolybdenitesamplesoftheore—formingstagewereco
6、llectedforRe—Osisotopedatingtodeterminethechronologyoftheoredeposit.Theanalyticalresultsyieldanisochronageof(152.0±3.3)Ma(MSWD=2.4)andweightedaveragemodelageof(150.6±1.3)Ma(MSWD=1.4).Thisore—formingageisinaccordancewithmostagedataoftungstendepositsfromtheNanlingMountainsandvici
7、nityare.as,indicatingthattheXia—tonglingtungstendepositistheproductofthepeakperiodofmiddleYanshanianlarge—scaletungstenmetallogen—esisinSouthChina.AComparisonwithmostvein—typetungstendepositsineasternNanlingshowsthatmolyb—denitefromtheXiatonglingoredeposithasrelativelyhighRecon
8、tent,whichsuggeststheadditionofmantle—de—rivedmaterial
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