云南马关碧（钾）玄质火山角砾岩中矿物混晶包体特征及其地质意义-论文.pdf

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1、第2O卷第2期地学前缘(中国地质大学(北京)；北京大学)VoL2ONo．22()l33月EarthScienceFrontiers(ChinaUniversityof(e0scIences(Being)；PekingUnivershy)Mar．2O13云南马关碧(钾)玄质火山角砾岩中矿物混晶包体特征及其地质意义黄玉蓬，刘显凡，一，李春辉，卢秋霞，陶专，赵甫峰，董毅，邹金汐，易立文1．成郁理】大学地球科学学院，四川成都6]00592．巾}叫地质大学(武汉)地质过程与矿产资源国家重点实验室，湖北武汉43()074HUANGYupeng，LI

2、UXianfan'。一，LIChunhui。LUQiuxia，TAOZhuan，ZHAOFufeng，D()NGYi。ZOUJinxi，YIIAwen1．InstituteojEarthS(ience，CkengduUniversityojTeehnology，Chengdu610059，China2．．~tateKeyLaboratory(1fGeologic、alPrrxessesandMineralResources，('hinaUniversityojGeos~iemes(Wuhan，Wukan43007,4·ChinaHUAN

3、GYupeng，LIUXianfanL1Chunhui，eta1．Characteristicsofmixcrystalxenolithfrombasaltic(shoshonitic)volcanicbrecciaatMaguanArea．YunnanProvince，andtheirgeologicalsignificance．EarthScienceFrontiers，2013，20(2)：186—196Abstract：Aspecialkindofxenolithhasbeendiscoveredfromthebasaltic(

4、shoshonitic)volcanicbrecciaatMaguanarea，YunnanProvince．Yherearetwokindsofxenoliths：oneisredandtheotherisblackincolor．ItcanbeidentifiedbyXraycrystalpowderdiffractionthattheredoneisamixedcrystalofaphanitesamorphousmaterial，themajorpotentialcomponentofwhichisspessartine，whi

5、letheblackoneisamixedcrystalofapha—nitesamorphousmaterial，majorpotentialcomponentofwhichisomphacite．Tosomeextentthetwokindofmixedcrystalsaresimilartomehingglassormeltpockets．Itshowsthattheyhavethesimilargeochemicalcharacteristicsofcogeneticrockevolution．Byanalyzingtheirm

6、icroscopicfeaturesandgeochemicalcharacteristics，thepresentpapersuggeststhattheyarepartialmeltingproductsfromthedepletedmantleandarecarried，transportedanderuptedbyalkalinebasalticmagma，asanimmisciblemelt．Theyrepresentthecomponentofgarnel(eclogitephase)mantle，anditissugges

7、tedthattheCenozoicasthenosphericupwelling，inaddi—tiontothereleaseofsmall—volumeofmehtoreplaceuppermantlecausingitsenrichment，hadalsoresuhedinthedelaminationoflithosphericmantle，andthespinelmantlecomponentsweretransformedtothegarnetnmntlecomponents．Besides，accordingtothed

8、ifferenloriginsofthetwokindsofmixedcrystals，andofothertypesofxenolithsandthehostnmgnm，itissuggestedthat