霍邱矿田李老庄铁矿地质与地球化学特征及对沉积环境的指示-论文.pdf

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1、1000-0569／2013／029(07)一2593-05ActaPetrologicaSinica岩石学报霍邱矿田李老庄铁矿地质与地球化学特征及对沉积环境的指示黄华张连昌刘显凡李红中刘利HUANGHua，ZHANGLianChang2UUXianFan，LIH0ngZh0ngzandUULi，1．成都理工大学地球科学学院，成都6100592．中国科学院地质与地球物理研究所，中国科学院矿产资源研究重点实验室，北京1000291．CollegeofEaahSciences，ChengduUniversityof

2、Technology，Chengdu610059，China2．KeyLaboratoryofMineralResources，InstituteofGeologyandGeophysics，ChineseAcademyofSciences，Be彬ng100029，China2013-02—22收稿．2013-054)3改回．HuangH，ZhangLC，LiuXF，LiHZandLiuL．2013．GeologicalandgeochemicalcharacteristicsoftheLeeLaozhuang

3、ironmineinHuoqiuirondeposit：Implicationsforsedimentaryenvironment．ActaPetrologicaSinica，29(7)：2593-2605AbstraetTheLeeLaozhuangironmineliesinthecentralpartsofAnhuiHuoqiuirondepositwhichistectonicallylocatedinthesouthernmarginoftheNorthChinaCraton．Theirofloreb

4、odyishostedinbiotitequa~zhornblendeplagioclasegneiss(schist)andmarble，bothoftheirprotolithsarefine—grainedclasticrocksandmagnesium—richcarbonaterocks．respectively．Theironorebodyismainlyoccurredasbanded，disseminatedandmassive．Petrologyandmineralogystudyarecon

5、ductedonsamplesfromtheLeeLaozhuangironmine．whilemajorandtraceelementcompositionswereanalyzedontheironoresandsurroundingrocks．TheresultshaveshownthatLeeLaozhuangironoresaremainlycomposedofFe2O3，SiO2，MgOwithlowcontentofA1203and02．Thetraceelementcompositionsand

6、totalcontentsofrareearthelementarelow．Theironoresampleshave(La，，Yb)PAAs0f0．2～0．5，significantpositiveanomalyinLa(La／La=2．07～4．03)、Eu(Eu／Eu=1．72～3．60)andY(Y／Y=1．50—1．87)．TheyhavehighY／Ho(Y／Ho：38．4—47．31withanaverageof42．12)andSr／BafSr／Ba=4．92～28．90withanaverag

7、eof13．68)．ThesecharacteristicsdemonstratedthatmetallogenicmaterialsoftheLeeLaozhuangironminearemainlysourcedfromthemixtureofhydrothermalandseawater．ThebandedironformationshavenosignificantnegativeanomalyofCe(Ce／Ce=0．67—0．81)．incombinedwithlowFe2O3／FeO(Fe203／

8、FeO=2．60—3．19withanaverageof2．95)，indicatingitistheprimaryore．Inaddition，thegeochemicalanalysishaveshown出attheprotolithsofschistandgneisswithinironoreintheLeeLaozhuangironminemaybeformedfromclay