摘要
新疆西天山菁布拉克岩带基性－超基性岩的全岩εＮｄ（ｔ）约为－５．１－＋６．４，８７Ｓｒ／８６Ｓｒ（ｔ）约为０．７０３７－０．７０９４。幔源岩浆同化围岩和结晶分异联合作用（即ＡＦＣ过程）可以解释这些岩石的Ｎｄ、Ｓｒ同位素组成。
The Qinbulake mafic-ultramafic intrusions are located in the West Tianshan Mountain,tectonically in the southern margin of the Yili microplate and close to the Tarim block.Seven whole rock samples from six intrusions have ε_(Nd)(t)values ranging from -5.l to +6.4,and 87Sr/86Sr(t) values from 0.7037 to 0.7094. All but one sample show high initial Nd and Sr isotopic ratios. Based on major element and Nd and Sr isotopic compositions of the intrusions and their country rocks, it is concluded that crustal materials must have been introduced into these intrusions during their formation, most probably through AFC type mixing.
出处
《地球化学》
CAS
CSCD
北大核心
1995年第2期121-127,共7页
Geochimica
基金
国家三0五项目
北京中关村联合测试基金
关键词
钕
锶
同位素
超基性岩
地球化学
基性岩
Nd and Sr isotopes
mafic-ultramafic intrusion
Xinjiang
