滇西马厂箐煌斑岩成因_地球化学__省略_sr_nd_pb_hf同位素约束_贾丽琼

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1、1000-0569/2013/029(04)-1247-60ActaPetrologicaSinica岩石学报滇西马厂箐煌斑岩成因:地球化学、年代学及*Sr－Nd－Pb－Hf同位素约束1，21，21，231，441，41，2贾丽琼莫宣学董国臣徐文艺王梁郭晓东王治华韦少港1，21，21，231，441，41，2JIALiQiong，MOXuanXue，DONGGuoChen，XUWenYi，WANGLiang，GUOXiaoDong，WANGZhiHuaandWEIShaoGang1.中国地质大学地球科学与资源学院，北京1000832.中国地质大学地质过程与矿

2、产资源国家重点实验室，北京1000833.中国地质科学院矿产资源研究所，北京1000374.武警黄金地质研究所，廊坊0650001.SchoolofEarthSciencesandResources，ChinaUniversityofGeosciences，Beijing100083，China2.StateKeyLaboratoryofGeologicalProcessesandMineralResources，ChinaUniversityofGeosciences，Beijing100083，China3.InstituteofMineralResou

3、rces，ChineseAcademyofGeologicalSciences，Beijing100037，China4.GoldGeologyInstituteofChineseArmedPoliceForce，Langfang065000，China2012-10-18收稿，2013-01-20改回.JiaLQ，MoXX，DongGC，XuWY，WangL，GuoXD，WangZHandWeiSG.2013.GenesisoflamprophyresfromMachangqing，westernYunnan:Constraintsfromgeochemi

4、stry，geochronologyandSr-Nd-Pb-Hfisotopes.ActaPetrologicaSinica，29(4):1247－1260AbstractLamprophyresoccurasearlyandlatedykesinMachangqing，westernYunnan.Theearlylamprophyresaremostlykersantonsandthelateareminettes.ZirconLA-MC-ICP-MSU-Pbdatingyieldsanageof33.77±0.11Ma，whichindicatelamp

5、rophyresaretheproductofmiddlestagemagmaticprocessofMachangqingcomplexandearlypulseofCenozoicmagmatismintheJinshajiang-Ailaoshanfaultbelt.Geochemically，thelamprophyreshavehighvaluesofpotassium(K2O/Na2O=2.88～4.60)，#alkaline(K2O+Na2O=6.40%～7.55%)andMg(74.3～76.9)andareenrichedinlargeio

6、nlithophileelements(K，Rb，Ba)andLREEsanddepletedinthehighfieldstrengthelements(Nb，Zr，P)andHREEs.Theisotopesoflamprophyresarecharacterized8786208204byhigh(Sr/Sr)i(0.707406～0.706506)，lowεNd(t)(－1.78～－7.64)butenrichedradioactivePb(Pb/Pb=38.87～20720420620417617739.35，Pb/Pb=15.6390～15.64

7、31，Pb/Pb=18.6579～18.8093).TheratiosofHf/Hfrangefrom0.282712to0.282864，withεHf(t)valuesvaryingfrom－1.4to4.0.TheεNd(t)andεHf(t)valuesshowaNd-Hfdecouplingfeature.Basedonthegeochemistry，isotopesandtheregionaltectonicevolutionhistory，thelamprophyreswerederivedfromEMIIproducedbyaninterac

8、tionbetweentheJinshajiango