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时间:2020-03-26
《青海省洪水河铁矿床岩石学、地球化学特征及其成因.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、矿物岩石地球化学通报ButtetlnofMineralogy,PetrologyandGeochem~.stry·研究成果·Vo1.35No.2,Mar.,2016青海省洪水河铁矿床岩石学、地球化学特征及其成因廖鹏程,吕新彪,,贾启元,高学鹏2,张9巾,毛晨1.中国地质大学(武汉)资源学院,武汉430074;2.中国地质大学地质过程与矿产资源国家重点实验室,武汉430074摘要:为探讨青海洪水河铁矿床的成矿物质来源及形成环境,选取典型铁矿石和赋矿围岩进行主量元素、微量元素和稀土元素分析测试。结果表明,铁矿石富S
2、iO:和TFe:O,,其zr(Nb)一A1:0,zr(Nb)一TiO具强相关性,稀土元素呈现轻稀土元素亏损、重稀土元素富集的特征,具La、Y正异常,无明显Eu异常,无Ce负异常。分析认为,洪水河铁矿矿质来源于远离火山口的地幔源区热液,在形成过程中有较多陆源碎屑的加入,而最终形成于海底低温热液和海水混合的还原环境。结合东昆仑地区构造演化历史可认为洪水河铁矿形成于元古宙大陆裂谷边缘环境,为幔源岩浆活动的热水沉积产物。关键词:地球化学特征;成因;洪水河铁矿;青海中图分类号:P618.31文章编号:1007—2802(
3、2016)02—0285·10doi:10.3969/j,issn,1007—2802.2016.02.008PetrologicandGeochemicalCharacteristicsoftheHongshuiheIronDepositinQinghaiProvince:ImplicationforOreGenesisLIAOPeng.cheng,LVXin—biao,,JIAQiyuan,GAOXue.peng,ZHANGShuai,MAOChert1.FacultyofResourceDepartmen
4、t,ChinaUniversityofGeosciences,Wuhan430074,China;2.StateKeyLaboratoryofGeologicalProcessesandMineralResources,ChinaUniversityofGeosciences(Wuhan),Wuhan430074,ChinaAbstract:Inordertodiscusstheoriginofore—formingmaterialandmetallogenicenvironmentoftheHongshuih
5、eironde-posit,whichislocatedintheQinghaiProvince,major,traceandrareearthelementsoftypicalironoresandhostrockshavebeenanalyzedinthispaper.ThedataindicatethatironoresareenrichedinSiO2andTFe2O3,withstrongpositivecorrelationsbetweenZr(Nb)andTiO2,Zr(Nb)andA1203,f
6、eaturesofLREEdepletionandHREEenrichment,LaandYpositiveanomalies,butwithoutpronouncedEuandCenegativeanomalies,Thesefeaturesmeanthattheore—formingmate—rialoftheHongshuiheirondepositcomesfrommantle-sourcedhydrothermalsolutionsfarawayfromcrater,withtheaddi—tiono
7、fcontinentalelasticcomponents.Thedepositwasfinallyformedinreducedenvironmentwhichwasduetothemixingoflow-temperaturehydrothermalsolutionsandseawater.ConsideringthetectonicevolutionoftheEasternKunlunregion,itissuggestedthattheHongshuiheirondepositwasformedinth
8、eProterozoiccontinentalriftenvironmentthroughsedimenta—tionofhydrothermalfluidassociatedwithmantle—derivedmagmaticactivities.Keywords:geochemistry;oregenesis;HongshuiheironDeposit;Qinghai青海省祁漫塔格
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