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南秦岭紫阳-岚皋地区早古生代晚期镁铁质岩脉及玄武岩的εNd(t)=+3.28~+5.02,(87Sr/86Sr)i=0.70341~0.70555,(206Pb/204Pb)i=17.256~18.993,(207Pb/204Pb)i=15.505~15.642,(208Pb/204Pb)i=37.125~38.968,?8/4=21.18~77.43,△7/4=8.11~18.82,基本与南秦岭区新元古代中期以来的幔源岩石特征一致,显示了HIMU,EMII和少量EMI富集地幔端元组分混合而成的Sr