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ID:33341437
大小:2.92 MB
页数:14页
时间:2019-02-24
《庐枞盆地泥河铁矿床中硬石膏微量元素特征、沉淀机制及其对-岩石学报》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、10000569/2017/033(11)353144ActaPetrologicaSinica岩石学报庐枞盆地泥河铁矿床中硬石膏微量元素特征、沉淀机制及其对铁成矿作用的制约1,21,22,3刘一男范裕张乐骏1,21,22,3LIUYiNan,FANYuandZHANGLeJun1合肥工业大学资源与环境工程学院,合肥2300092合肥工业工业大学矿床成因与勘查技术研究中心,合肥2300093CentreofExcellenceinOreDeposit,UniversityofTasmania,Pri
2、vateBag79,Hobart1SchoolofResourcesandEnvironmentalEngineering,HefeiUniversityofTechnology,Hefei230009,China2OreDepositandExplorationCentre,HefeiUniversityofTechnology,Hefei230009,China3CentreofExcellenceinOreDeposit,UniversityofTasmania,PrivateBag79,Hobart,Aus
3、tralia20170801收稿,20171009改回LiuYN,FanYandZhangLJ2017Precipitationmechanism,REEcharacteristicsofanhydriteinNihedepositanditsrelationtomineralizationActaPetrologicaSinica,33(11):3531-3544AbstractNiheisamajormagnetiteapatitedepositlocatedinthenorthwesternthe
4、LuZongvolcanicbasinintheMiddleLowerYangtzeRiverValleyMetallogenicBeltAnhydriteisextensivelydevelopedinthedepositBasedonthedetailedfieldgeologicalworkandpetrographicobservation,theanhydritecanbedividedintothreetypesonthebasisofthemineralassemblageandstage:Type
5、I,tabularvioletcrystalscoexistingwithdiopside,magnetite,pyriteandapatite;TypeII,tabularwhitecrystalscoexistingwithpyrite;andTypeIII,equantpinkorwhitecrystalsincarbonateanhydriteveinsWepresentinsituLAICPMSgeochemicaldataforthethreedifferenttypesofanhydriteinNi
6、hedepositLAICPMSdataindicatethattypeIanhydritecontainsmuchmoreREEthantheothertwotypes,andtheREEpatternandEuanomalyisalsoquitedifferent((La/Yb)N=11~466,δEu=03~24)TypeIIandTypeIIIhavesimilarREEpattern.CrystallographyhaslittleinfluenceonanhydriteREEcontentint
7、heNiheirondeposit,temperature,fluidevolutionandcomplextypeismainfactorcontrollingtheREEpattern.Intheearlyhightemperaturehydrothermalsolution,REEmainlymigratesintheformofClcomplexAfterprecipitatingtheREErichminerals,theREEcontentgreatlydecreasedinthefluid,-resu
8、ltinginalackofREEintypesIIandIII,andtheirREEpatternsareflatInaddition,decreasingfluidsalinitycausedlowerCl/2-SO4ratiosinlaterstagesFurthermore,sometypeIIIanh
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