东准贝勒库都克岩体锆石Hf-O同位素研究  

Zircon Hf and O Isotopes of the Beilekuduke Pluton in East Junggar,Xinjiang,China

作　　者：韩宇捷[1,2] 甘林[1,2] 

机构地区：[1]中国科学院地球化学研究所地球内部物质高温高压实验室,贵州贵阳550002 [2]中国科学院研究生院,北京100049

出　　处：《新疆地质》2012年第2期157-160,共4页Xinjiang Geology

基　　金：国家自然科学基金项目(41172071);南京大学内生金属矿床成矿机制研究国家重点实验室开放基金项目(15-09-08)资助

摘　　要：对新疆东准噶尔贝勒库都克岩体具代表性岩石进行Hf-O同位素测定,结果显示贝勒库都克岩体碱长花岗岩和二长花岗岩锆石具较一致的高正εHf(t)值。两个样品εHf(t)值分别为εHf(t)=12.6±0.3(正长花岗岩)和εHf(t)=12.7±0.3(二长花岗岩),其中二长花岗岩δ18O=9.19。结合微量元素地球化学特征,认为贝勒库都克岩体花岗岩不是直接起源于亏损地幔,源岩可能是该区早期发育的玄武质洋壳与少量陆源沉积物的混合物。The Hf and O isotopes of zircons separated from the Beilekuduke pluton in east Junggar have been reported in this study. The analyzed results suggest that the Beilekuduke pluton has uniform Hf isotopic compositions and positive eHf（t） values.The zircon grains separated from two samples of alkali feldspar granite （BL2） and monzonitic granite （BL08-2） have the eHf（t） values of 12.6~0.3 and 12.7＋0.3,respectively. In addition, the monzonitic granite has 6180 value of 9.19.In combination with the previous published trace element compostions of the Beilekuduke pluton,we proposed that it was probably originated from a mixed source of basaltic oceanic crust and continental sediments, rather than from the depleted mantle directly.

关 键 词：东准噶尔 贝勒库都克岩体 锆石Hf-O同位素 

分 类 号：P597.3[天文地球—地球化学]