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Stable Neodymium Isotope Ratios of Geological Reference Materials

文献类型： 外文期刊

作者： Bai, Jianghao 1 ; Ma, Jinlong 1 ; Wei, Gangjian 1 ; Zhang, Le 1 ; Liu, Chengshuai 5 ; Gao, Ting 6 ; Liu, Yuhui 3 ; Liu, Yufei 7 ;

作者机构： 1.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China

2.CAS Ctr Excellence Deep Earth Sci, Guangzhou 510640, Peoples R China

3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China

4.Southern Marine Sci & Engn Guangdong Lab, Guangzhou 511458, Peoples R China

5.Guangdong Inst Ecoenvironm & Soil Sci, Guangdong Key Lab Agr Environm Pollut Integrated, Guangzhou 510650, Peoples R China

6.Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, Guiyang 550081, Peoples R China

7.China Geol Survey, Guangzhou Marine Geol Survey, Guangzhou 510075, Peoples R China

关键词： stable Nd isotopic ratio; TODGA resin column; C-SSBIN; MC-ICP-MS; geological reference materials

期刊名称：GEOSTANDARDS AND GEOANALYTICAL RESEARCH （ 影响因子：4.343； 五年影响因子：4.888 ）

ISSN： 1639-4488

年卷期：

页码：

收录情况： SCI

摘要： Here, we report the stable Nd isotopic compositions of twenty-seven widely available geological reference materials (RMs) including silicates, sediments, soils and carbonates. Nd was purified from geological samples using a single TODGA resin column. The Nd isotopic ratios were determined via MC-ICP-MS using the combined standard-sample bracketing and internal normalisation method. The (long-term) intermediate measurement precision of delta Nd-146/144 values relative to the reference material JNdi-1 was greater than 0.030 parts per thousand (2s). Measurements of five previously analysed RMs yielded delta Nd-146/144 values that were consistent with those obtained using the double-spike method. The igneous rocks showed minimal variations in their delta Nd-146/144 values, which ranged from -0.039 parts per thousand to +0.015 parts per thousand. The sediments displayed large stable Nd isotopic fractionations ranging from -0.099 parts per thousand to +0.057 parts per thousand, implying differences in their sources. The soil RMs showed a range of -0.093 parts per thousand to -0.010 parts per thousand, likely owing to complex geological processes such as the degree of chemical weathering. The sedimentary rock dolomite had the heaviest delta Nd-146/144 values at +0.147 +/- 0.032 parts per thousand (2s, n = 3). Of the analysed RMs, the delta Nd-146/144 values of thirteen of them are being reported for the first time. The datasets presented here should play fundamental role in quality assurance and allow for universal comparisons for stable Nd isotope systematics.

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