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时间:2019-02-27
《铁同位素体系及其在矿床学中的应用_王跃》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、1000-0569/2012/028(11)-3638-54ActaPetrologicaSinica岩石学报*铁同位素体系及其在矿床学中的应用**王跃朱祥坤**WANGYueandZHUXiangKun中国地质科学院地质研究所国土资源部同位素地质重点实验室,大陆构造与动力学国家重点实验室,北京100037InstituteofGeology,CAGS,LaboratoryofIsotopeGeology,MLR;StateKeyLaboratoryforContinentalTectonicsandDynamics,Beijing100037,China2012-05-10收稿,2012-0
2、8-10改回.WangYandZhuXK.2012.Feisotopesystematicsanditsimplicationsinoredepositgeology.ActaPetrologicaSinica,28(11):3638-3654AbstractOnthebasisofFeisotopecompositionsofdifferentFe-bearingmineralsworldwidereportedinthispaper,togetherwithliteraturedata,Feisotopedistributionsofdifferentmineralsandreservoi
3、rs,aswellasdifferenttypesofdeposits,weresummarizedinsomedetail,whichprovideareferenceframeworkofFeisotopesystem.ApplicationsofFeisotopesysteminthestudyoforedepositswerereviewed.Feisotopefractionationoccursduringfluidexsolutionandthatfluidisenrichedinlightisotopesrelativetostock.Inahydrothermalfluids
4、ystem,ironisotopesfractionateduringfluidevolutionduetoprecipitationofFe-bearingminerals.PrecipitationofFe(III)mineralsleavestheremainingfluidenrichedinlightisotopes,whileprecipitationofFe(II)mineralsmakestheFeisotopiccompositionofthefluidprogressivelyheavier.PrecipitationofFe-bearingmineralsresultsi
5、ntheFeisotopecompositionofresidualfluidsevolvingwithtime.Feisotopespotentiallyservetoidentifyprecursorsinorealterationproducts.Thehigh-Taltereationmineralsareenrichedinheavyisotopesrelativetoprecursors,whilethelow-Talterationmineralsinheritthecompositionofprecursorsthroughout.TheregularityofFeisotop
6、efractionationduringfluidexsolutionandevolutionprocesseslaysanimportantfoundationinusingFeisotopesasatracerformetallogenicmaterialsource.KeywordsFe-bearingminerals;Feisotopes;Fluidexsolution;Fluidevolution;Metallogenicmaterialsource摘要本文报道了世界范围内不同含铁矿物的Fe同位素组成,进一步了解了铁同位素在不同含铁矿物中的基本分布特征;系统总结了铁同位素在不同储库和
7、不同类型矿床中的分布特征,构筑了铁同位素体系的基本框架;结合最新的研究成果,较全面地总结了铁同位素在矿床学领域的应用,得出了铁同位素可以用来示踪流体出溶、流体演化、表生蚀变作用和成矿物质来源的基本认识。在流体出溶过程中,相对于岩体,出溶的流体富集铁的轻同位素;成矿流体体系的演化过程中,矿物的结晶沉淀会导致铁同位素发生分馏,随着Fe(III)矿物的结晶沉淀,流体逐渐富集铁的轻同位素,随着Fe(II)
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