Nickel Isotope Variations in Terrestrial Silicate Rocks and Geological Reference Materials Measured by MC-ICP-MS
Nickel Isotope Variations in Terrestrial Silicate Rocks and Geological Reference Materials Measured by MC-ICP-MS
复制标题
DOI：
10.1111/j.1751-908x.2013.00209.x
复制
发表时间：
2013-09-01
影响因子：
3.8
通讯作者：
Fouquet, Yves
中科院分区：
文献类型：
--
作者：
Gueguen, Bleuenn;Rouxel, Olivier;Fouquet, Yves
虽然初步研究已证明镍同位素可用于宇宙化学和作为潜在的生物标志，但对陆地火成岩和沉积岩以及矿床的镍同位素组成仍然知之甚少。我们的贡献有四个方面：（a）详细说明镍同位素测定的分析程序，（B）测定各种地质参考材料的镍同位素组成，（c）相对于镍同位素参考材料NIST SRM 986评估块状硅酸盐地球的同位素组成，（d）报告岩浆岩和矿床中质量相关的镍同位素分馏范围。通过两阶段色谱程序纯化后，通过MC-ICP-MS测量Ni同位素比，并使用双尖峰校正方法校正仪器质量偏差。测量精度（平均值的两个标准误差）在0.02和0.04千分之一之间，NIST SRM 986的中间测量精度为0.05千分之一（2s）。岩浆岩和地幔岩的Ni-60/58值在-0.13至+0.16 ‰之间，表明平均BSE成分为+0.05 ‰。锰结核（Nod A1; P1）、页岩（SDO-1）、煤（CLB-1）和金属污染土壤（NIST SRM 2711）显示正值，范围为+0.14至+1.06ppm，而科马提岩中富含镍的硫化物则为-0.10至-1.03ppm。
Although initial studies have demonstrated the applicability of Ni isotopes for cosmochemistry and as a potential biosignature, the Ni isotope composition of terrestrial igneous and sedimentary rocks, and ore deposits remains poorly known. Our contribution is fourfold: (a) to detail an analytical procedure for Ni isotope determination, (b) to determine the Ni isotope composition of various geological reference materials, (c) to assess the isotope composition of the Bulk Silicate Earth relative to the Ni isotope reference material NIST SRM 986 and (d) to report the range of mass-dependent Ni isotope fractionations in magmatic rocks and ore deposits. After purification through a two-stage chromatography procedure, Ni isotope ratios were measured by MC-ICP-MS and were corrected for instrumental mass bias using a double-spike correction method. Measurement precision (two standard error of the mean) was between 0.02 and 0.04 parts per thousand, and intermediate measurement precision for NIST SRM 986 was 0.05 parts per thousand (2s). Igneous- and mantle-derived rocks displayed a restricted range of Ni-60/58 values between -0.13 and +0.16 parts per thousand, suggesting an average BSE composition of +0.05 parts per thousand. Manganese nodules (Nod A1; P1), shale (SDO-1), coal (CLB-1) and a metal-contaminated soil (NIST SRM 2711) showed positive values ranging between +0.14 and +1.06 parts per thousand, whereas komatiite-hosted Ni-rich sulfides varied from -0.10 to -1.03 parts per thousand.