同一岩石试样的Lu-Hf和Sm-Nd快速分离及国家岩石标准物质的Hf-Nd同位素比值精确测定  

Rapid separation of Lu-Hf and Sm-Nd from a single rock dissolution and precise measurement of Hf-Nd isotopic ratios for national rock standards

作　　者：李献华[1] 刘颖[1] 杨岳衡[2] 陈福坤[2] 涂湘林[1] 祁昌实[1] 

机构地区：[1]中国科学院广州地球化学研究所同位素年代学和地球化学重点实验室,广州510640 [2]中国科学院地质与地球物理研究所岩石圈国家重点实验室

出　　处：《岩石学报》2007年第2期221-226,共6页Acta Petrologica Sinica

基　　金：国家自然科学基金委创新研究群体项目(40421303);中国科学院广州地球化学研究所前沿领域项目(GIGCX-0306)资助

摘　　要：本文报道基于Li_2B_4O_7熔融样品、采用AG50W-X8和HDEHP组合或RE和HDEHP组合色谱交换柱,对同一岩石试样快速分离Sm-Nd-Lu-Hf的方法。用这两种方法对国际岩石标准BHVO-2、GSP-2和JB-1进行了Lu-Hf、Sm-Nd分离和^(143) Nd/^(144)Nd、^(176)Hf/^(177)Hf测定,并测定了BHVO-2、JB-1和JB-3的Lu/Hf和Sm/Nd比值,获得的结果在误差范围内与这些样品的参考值一致。同时,我们对国家岩石标准物质GBW07109、GBW07110和GBW07113进行了多次平行分析,首次获得了这些岩石标准的Nd-Hf同位素结果。Abstract We present in this study an improved chemical separation method for Lu-Hf and Sm-Nd from a single rock dissolution. Rock samples were digested using Li2 B4 O7 fusion in order to complete decomposition of refractory accessory minerals. Separation of Sm- Nd-Lu-Hf was carried out using a combination of either Dowex AG5OW-X8 and HDEHP chromatographic columns or Eichrom RE and HDEHP columns. Analytical reproducibilities of Nd and Hf isotopic ratios were demonstrated for USGS rock standards BHVO-2 and GSP-2 and GSJ rock standard JB-1 and reproducibilities of Lu/Hf and Sm/Nd were demonstrated for BHVO-2, JB-1 and JB-3. Our results show overall good agreement with the recommended values. In addition, we conducted duplicated analyses on national rock standards GBW07109, GBW07110 and GBW07113, and reported for the first time their Nd and Hf isotopic ratios.

关 键 词：Lu-Hf-Sm-Nd化学分离 Nd-Hf同位素比值 岩石标样 

分 类 号：P597.3[天文地球—地球化学]