地幔柱-岩石圈交换的证据.pdf

Acta Sinica岩石学报 1000-0569／2004／020(03)讲83．94Petrologica 甘肃西秦岭新生代钾霞橄黄长岩和碳酸岩的微量、 稀土和Sr，Nd，Pb同位素地球化学 地幔柱．岩石圈交换的证据+ 喻学惠 赵志丹 莫宣学 王永磊 肖振 朱德勤 YU ZhenandZHU XueHui，ZHAOZhiDan，noXuanXue，WANGYongLei，XIAO DeQin 中国地质大学，北京100083 China 100083，China UnbarsityofGeosdences，Bering 2003·10-05收稿。2004-04-28改回． Yu ZandZhu and XH。ZhaoZD。MoXX。WangYL．Xiao DQ．2004．Traceelements。REESr。Nd-Pbisotopic ofCenozoic andcarbonatitefromwest of geochemistrykamafugite Qinling，Gansuprovince：ImpUcation interaction．Acta PetrologicaSiniea，20(3)：41t3-494 AbstractThe andearbonatitesinWest havetllecharacteristicsrichinLILEandLREE．The kamafugites Qinling．Gansuprovince the distributionof REEehondrite．normalizedis liketothatoneofOIB．(”Sr／”sr)iofthe andcarbonatite pattern by very kamafugite and iS0．70381一O．709400．70529—0．71332 ofthevolcanicrocksi80．512404—0．512924and0．512210 respectively．‘”Nd／“3Nd ～0．512928 calculatedisinthe liketothat of of一3．4—5．58，and respectively．8Nd range very 8Nd and”Pb／“Pbofthetwo ofvolcanicrocksare37．613～39．330and and type 38．060—38．995．15．842—16．44115．545。15．677． and18．418～22．4and18．149一19．062 thatWest Cenozoicvolcanicrockshavethe respectively．Itproved Qirding geochemical characteristicssimilarto theend—menbersofEMlandEMllinthesourcesin 0IB，and thediagramsof VS．Ni，￡(Nd)vs．