In situ Nd isotopic measurement of natural geological materials by LA-MC-ICPMS  

作　　者：YANG YueHeng SUN JinFeng XIE LieWen FAN HongRui WU FuYuan 

机构地区：[1]State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029 China

出　　处：《Chinese Science Bulletin》2008年第7期1062-1070,共9页

基　　金：the National Natural Science Foundation of China (Grant Nos. 40773008 and 40325006)

摘　　要：Using newly determined Sm isotopic abundances for correcting the isobaric interference of 144Sm on 144Nd and the established mass bias relationship between Sm and Nd, a series of in situ Nd isotopic measurements were conducted for relatively high Nd concentrations of natural geological materials, including apatite, titanite, monazite and perovskite on a Neptune multi-collector inductively coupled plasma mass spectrometry (MC-ICPMS), coupled to a 193 nm ArF excimer laser ablation system. The results show that Ce has no significant influence on the precision and accuracy of Nd isotopic analyses for LREE-enriched geological minerals and that our approach is efficient in obtaining reliable 143Nd/144Nd and 147Sm/144Nd ratios for those materials with Sm/Nd<1 (147Sm/144Nd<0.6). When combined with trace element and U-Pb isotope data, the in situ Nd isotopic data can provide important information on geological processes.Using newly determined Sm isotopic abundances for correcting the isobaric interference of ^144Sm on ^144Nd and the established mass bias relationship between Sm and Nd, a series of in situ Nd isotopic measurements were conducted for relatively high Nd concentrations of natural geological materials, including apatite, titanite, monazite and perovskite on a Neptune multi-collector inductively coupled plasma mass spectrometry （MC-ICPMS）, coupled to a 193 nm ArF excimer laser ablation system. The results show that Ce has no significant influence on the precision and accuracy of Nd isotopic analyses for LREE-enriched geological minerals and that our approach is efficient in obtaining reliable ^143Nd/^144Nd and ^147Sm/^144Nd ratios for those materials with Sm/Nd〈1（^147Sm/^144Nd〈0.6）. When combined with trace element and U-Pb isotope data, the in situ Nd isotopic data can provide important information on geological processes.

关 键 词：钕 同位元素 测量方法 地质材料 

分 类 号：P59[天文地球—地球化学]