00002滇西北羊拉铜矿矿区花岗岩成因及其构造意义

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1、1000-0569/2011/027(09)-2553-66ActaPetrologicaSinica岩石学报*滇西北羊拉铜矿矿区花岗岩成因及其构造意义1，21＊＊111，234朱经经胡瑞忠毕献武钟宏陈恒叶雷龙斐1，21＊＊111，234ZHUJingJing，HURuiZhong，BIXianWu，ZHONGHong，CHENHeng，YELeiandLONGFei1.中国科学院地球化学研究所矿床地球化学国家重点实验室，贵阳5500022.中国科学院研究生院，北京1000493.有色金属矿产地质调查中心新疆地质调查所，乌鲁木齐83

2、00114.云南迪庆矿业开发股份有限责任公司，香格里拉6744001.StateKeyLaboratoryofOreDepositGeochemistry，InstituteofGeochemistry，ChineseAcademyofSciences，Guiyang550002，China2.GraduateSchoolofChineseAcademyofSciences，Beijing100049，China3.XinjiangInstituteofGeologicalSurvey，ChinaNonferrousMetalGeo

3、logicalSurvey，Urumqi830011，China4.MiningDevelopmentCo.，Ltd，Diqing，Yunan，Shangri-La674400，China2010-05-25收稿，2011-07-04改回.ZhuJJ，HuRZ，BiXW，ZhongH，ChenH，YeLandLongF.2011.GenesisandtectonicsignificanceofgranitesintheYanglaoredistrict，northwesternYunnanProvince.ActaPetrologi

4、caSinica，27(9):2553－2566AbstractTheYanglacopperdepositislocatedinthemiddlezoneofJinshajiangsuturezone.TheBeiwu，LinongandLunonggranitoidsexhibitalineardistributionfromnorthtosouthintheoredistrict.Thethreegranitoidshavesimilarcompositionsofmajor，traceelementsandSr-Ndisot

5、opes，indicatingthattheyhaveacommonmagmasource.Theydonotcontainmuscovite，andhavehighconcentrationsofSiO2(64%～73%)，K2O(2.15%～4.05%)andlowP2O5(0.04%～0.11%)content.Inaddition，theyhave2lowδ((K2O+Na2O)/(SiO2-43);1.4～2.4)andA/CNK(molecularAl2O3/(CaO+Na2O+K2O);0.92～1.11).Thegr

6、anitoidsdisplaysignificantlynegativeanomaliesofNb，Ta，TiandP，obviousenrichmentofLREEandRb，Th，UandPb.The10000Ga/Alratios(1.7～2.1)ofthoserocksarelowerthantypicalA-typegranites.Moreover，consideringtheslightlynegativeEuanomalies，itissuggestedthatthethreegranitoidsbelongtohi

7、gh-Kcalc-alkaline，metaluminous-slightlyperaluminousI-typegranites.Comparedwith8786thecontinentalcrust(i.e.，theLincanggraniteandtheShabagranulite)，thegraniteshavelower(Sr/Sr)i(0.7078～0.7105)andhigherεNd(t)(－5.1～－6.7)，withancientNdtwo-stagemodelage(tDM2=1.5Ga).Andthereoc

8、curanumberofcoevalmaficmicrogranularenclaves(MMEs)inthesegranitoids，suggestingthatmantle-drivedmagmaswereinvolvedinth