松潘—甘孜造山带东部金川地区黄岗岩类地质地球化学特征与构造背景

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1、西南科技大学硕士研究生学位论文第1II页AbstractSongpan—Garzefoldbelt，locatedinthenortheasternmarginoftheTibet．anplateau，asthemaintectonicconvergencezoneofthenorthChinaplateandtheYangtzeplate，theQiangtangblock，underwenttwophasesoforogenesis：Paleo-TethysandNeo-Tethys，thetectonicevolutionprocessofcomplex，calle

2、d”Chinesegeologicalbermuda”．Acidicgranitoidswidelyexposedinthezone，forthesegranitoidemplacementage，petrolgeochemcharacteristics，rockformationmechanismandtectonicbackgroundandotherissuesofresearch，torevealtheSongpan·Garzefoldbeltcomplexgeologicalevolutionanditsdymamicmechanismhasimportants

3、cientificsignificance．Therefore，thepaperselecttherelativelyweakresearchofErmaomountain，Wanlicheng，Kongkaliangzi，DusongfourrockastheresearchobjectofJinchuanarea，easternoftheSongpan-Garzefoldbelt，onthebasisoffieldgeologicalinvestigation，tostudyindetailthecharacteristicsofpetrology,zirconu-p

4、bgeochronologyandgeochemistry，combinedwiththepreviousresearchresults，discussestheformationmechanismofthegranitoidsintheresearchareaandthetectonicenvironment．Obtainthefollowingresultsandunderstanding：(1)UsingtheLA-ICP-MSzirconu-pbdatingoffourrockoftheresearcharea，determinationofErmaomounta

5、inbiotitegraniteattheageof206．4+4．5Ma．Wanlichengbiotitegraniteagerespectivelyis209．24-4．2Ma，210土4．6Ma；biotitequartz-syeniteageis206士2．7Ma，indicatethatbiotitegraniteearlieremplacementofbiotitequartz-syenite．Kongkaliangzisyenograniteageis215．8土2．4Ma．Dusongadamelliteageis199．0士2．3Ma．Eachrock

6、formationageissimilar，showingthattheymaybeformedonauniformdeepgeodynamicprocesses．Inaddition，thereareproterozoicinheritedzirconintheErmaomountainandWanlichengrock，andthencombinedwiththeresultsofpreviousstudiesshowthatthelowerpartoftheSongpan-Garzefoldbeltmaybeexistencecontinentalcrustalba

7、sement，whichsamewiththeYangtzeblockbasement．(2)Geochemicalanalysisresultsshowthat，Ermaomountainrockastheperaluminoushigh-kcalcalkalinerocks．IntheWanlichengrockbiotitegraniteandadamelliteforperaluminousKcalc-alkalinerocks；syenitemonzoniteofpartialaluminium．．weakperal