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1、礦物巖石地球化學(xué)通報(bào)·研究成果·BulletinofMineralogy，PetrologyandGeochemistryVo1．33No．6，NOV．，2O14陽山金礦成礦流體的He—Ar同位素示蹤丁德建，梁金龍，孫衛(wèi)東，郭俊華。，李賀，葉先仁1．江西地礦局贛東北地質(zhì)大隊(duì)，江西上僥334000；2．中國科學(xué)院廣州地球化學(xué)研究所，礦物學(xué)與成礦學(xué)重點(diǎn)實(shí)驗(yàn)室，廣州510640；3．中國人民武裝警察部隊(duì)黃金第十二支隊(duì)，成都610036；4．中國科學(xué)院氣體地球化學(xué)實(shí)驗(yàn)室，蘭州730000摘要：甘肅陽山金礦的成因類型及成礦流體來源多年來頗受關(guān)注，本文利用惰性氣體同位素質(zhì)譜儀測(cè)
2、定了該礦床黃鐵礦和石英樣品中流體包裹體He、Ar同位素組成。結(jié)果顯示，成礦流體的。He／He值為0．O3～O．08Ra，指示成礦流體來源于殼源，不合慢源He；。Ar／Ar值為434．1～863．0，稍高于大氣飽和水(295．5)，流體中除地殼放射成因Ar外，還有大氣Ar，表明大氣降水曾參與成礦。結(jié)合礦床地質(zhì)特征，認(rèn)為陽山金礦成礦流體是以造山作用產(chǎn)生的變質(zhì)水與經(jīng)斷裂下滲的大氣飽和水為主，下滲的大氣飽和水與高U、Th含量的花崗巖發(fā)生水一巖交換，導(dǎo)致了成礦流體中極低的。Ar／He(0．0227~0．0539)。關(guān)鍵詞：陽山金礦；成礦流體；He-Ar同位素中圖分類號(hào)：P59
3、7文獻(xiàn)標(biāo)志碼：A文章編號(hào)：1007—2802(2014)l06—081307doi：10．3969／j．issn．1007—2802．2014．06．009He-ArIsotopesTracingforOreGenesisoftheYangshanGoldDepositDINGDe—jian，LIANGJin—long¨，SUNWei-dong，GUOJun—hua。，LIHe，YEXian—ren1．NortheasternJiangxiGeologicalSurveyingTeam，BureauofGeologyandMineralExploration，Sha
4、ngraoJiangxi334000，Chian：2．CASKeyLaboratoryofMineralogyandMetallogeny，GuangzhouInstituteofGeochemistry，ChineseAcademyofSciences。Guangzhou510640，China：3．The12thBranchofGoldHeadquartersofChinaArmedPoliceForce，Chengdu610036，China；4．DepartmentofGeochemistry，LanzhouInstituteofGeology，Chines
5、eAcademyofSciences，Lanzhou730000，ChinaAbstract：TheYangshangolddepositattractedresearchinterestsforitsoregenesisandore—formingfluidsources．ThisstudyanalyzedHeliumandArgonisotopescompositionsinfluidinclusionsofthepyrite—quartzveins．There—sultsshowedthat。He／HeratiosoftheYangshangolddeposi
6、tarewithin0．03—0．08Ra，indicatingthattheore—formingfluidswerecrust—derivedfluidswithnomantle—derivedHe．The。Ar／Arratiosvariedfrom434．1to863．0。whicharehigherthanthatoftheairsaturatedwater(295．5)，indicatedthattheair—saturatedwaterwasin—volvedintheore—formingprocess．Combinedwithgeologicalch
7、aracteristicsofthedeposit，wesuggestedthattheore—formingfluidsoftheYangshangolddepositweremainlythecrust—derivedmetamorphicfluidsmixedwithair—_saturatedwater．Theair—saturatedwaterseepeddownalongfaultsystemsandextractedradiogenicHeandArbywater—rockexchangingwithcountryrocksofhighUandTh
