西天山菁布拉克岩带基性－超基性岩的Nd、Sr同位素地球化学  

NEODYMIUM AND STRONTIUM ISOTOPIC GEOCHEMISTRY OF MAFIC-ULTRAMAFIC INTRUSIONS FROM QINBULAKE ROCK BELT,WEST TIANSHAN MOUNTAIN,XINJIANG

作　　者：陈江峰[1] 满发胜[1] 倪守斌[1] 

机构地区：[1]中国科学技术大学

出　　处：《地球化学》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

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.

关 键 词：钕 锶 同位素 超基性岩 地球化学 基性岩 

分 类 号：P588.124[天文地球—岩石学] P588.125[天文地球—地质学]