REE Geochemical Characteristics of Apatite,Sphene and Zircon from Alkaline Rocks  

作　　者：周玲棣 王杨传 

机构地区：[1]Institute of Geochermistry,Academia Sinica,Guiyang

出　　处：《Chinese Journal Of Geochemistry》1989年第3期245-253,共9页中国地球化学学报

摘　　要：The accessory minerals apatite and sphene are the main carriers of REE in alkaline rocks.Their chondrite-normalized REE patterns decline sharply to the right as those of the host rocks,In the patterns an obvious negative Eu anomaly and a positive Ce anomaly can be seen in apatite and sphene,respectively.Zircon from alkaline rocks is different in REE pattern,I,e,. a nearly symmetric'V'-shaped pattern with a maximum negative Eu anomaly.Compared with the equivalents from granites,apatite,sphene and zircon from alkaline rocks are all characterized by higher (La/Yb)N ratio and less Eu depletion,As to the relative contents of REE in minerals,apatite,sphene and zircon are enriched in LREE,MREE and HREE respectively,depending on their crystallochemical properties.The accessory minerals apatite and sphene are the main carriers of REE in alkaline rocks. Their chondrite-normalized REE patterns decline sharply to the right as those of the host rocks.In the pat- terns an obvious negative Eu anomaly and a positive Ce anomaly can be seen in apatite and sphene, respectively.Zircon from alkaline rocks is different in REE pattern,i.e.,a nearly symmetric “V”-shaped pattern with a maximum negative Eu anomaly.Compared with the equivalents from granites,apatite,sphene and zircon from alkaline rocks are all characterized by higher (La/Yb)_N ratio and less Eu depletion.As to the relative contents of REE in minerals,apatite,sphene and zircon are enriched in LREE,MREE and HREE respectively,depending on their crystallochemical properties.

关 键 词：稀土元素地球化学特征 磷灰石 榍石 锆石 碱性岩 

分 类 号：P588.15[天文地球—岩石学] P595[天文地球—地质学]