摘要
对盘石山一带的６个二辉橄榄岩包体、３个单斜辉石的Ｎｄ、Ｓｒ同位素，４个全岩、７个单斜辉石和１个斜方辉石的铅同位素进行了测定。结果表明，它们在亏损的岩石圈中经历了长时间的演化，其Ｒｂ－Ｓｒ、Ｓｍ－Ｎｄ、Ｐｂ－Ｐｂ同位素体系的相关性可能反映了不同时期的地幔过程。位于陆下岩石圈地幔中上部位的包体比下部岩石圈地幔具有相对亏损和不均一的同位素特征。
The Nd and Sr isotopic compositions of lherzolite xenolith (6 samples)and clinopyroxene(3 samples),as well as the Pb isotopic compositions of the whole rock(4 samples),clinopyroxene (7 samples)and orthopyroxene(1 sample), were determined. The results show that these rocks have experienced a long time in the depleted lithospheric mantle. The regular correlation in the Rb-Sr,Sm-Nd and PbPb isotopic systems may be the reflection of different mantle processes taking place before.The xenoliths occurring in the middle-upper continental lithospheric mantle are more depleted in isotopes than the lower lithospheric mantle.
出处
《地球化学》
CAS
CSCD
北大核心
1994年第3期245-253,共9页
Geochimica
基金
国家自然科学基金
关键词
二辉橄榄岩
矿物包体
同位素
钕
lherzolite
depleted mantle
Nd-Sr-Pb isotopes
Jiangsu
