Simultaneous determination of sulfur isotopes and trace elements in pyrite with a NanoSIMS 50L
Simultaneous determination of sulfur isotopes and trace elements in pyrite with a NanoSIMS 50L
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使用 NanoSIMS 50L 同时测定黄铁矿中的硫同位素和微量元素
DOI：
10.1039/c7ay01440f
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发表时间：
2017-12
影响因子：
3.1
通讯作者：
Yang Wei
中科院分区：
文献类型：
--
作者：
Zhang Jianchao;Lin Yangting;Yan Jun;Li Jinxiang;Yang Wei
黄铁矿是常见的硫化物矿物，参与了各种成矿、热液和生物活动，其硫同位素比值和微量元素含量及其空间分布在这些事件的过程中被记录下来。建立了利用纳米二次离子质谱（NanoSIMS）同时分析黄铁矿中34S/32S比值和微量元素含量的方法。首先，使用直径为250 nm的7 - 10 pA的Cs+束，通过光栅扫描20 × 20 μ m2至40 × 40 μ m2的区域，获得黄铁矿中S（34 S-）、As（75 As-）、Se（80 Se-）、Cu（63 Cu32 S-）、Au（197 Au-）和Pb（208 Pb32 S-）的图像。然后，通过在2 × 2 μ m2的面积上光栅扫描相同的电流，以斑点分析模式同时测量分区黄铁矿颗粒的各个层的34 S/32 S比值（32 S-通过使用法拉第杯测量，34 S-通过使用电子倍增器测量）和这些微量元素的浓度。用黄铁矿标准品Balmat或Py 1117校正~（34）S/~（32）S比值的基体效应，外部重现性（1SD）<0.5 ‰。利用分带黄铁矿样品中As、Se、Cu、Au和Pb的相对灵敏度因子（RSFs）对微量元素进行了标定。As、CuS、Au和PbS的测定参考标准偏差分别为4.43 ± 0.28、0.36 ± 0.04、0.18 ± 0.03和38.0 ± 15.1。以烂泥沟卡林型金矿黄铁矿为例，分析了黄铁矿的形成过程，揭示了黄铁矿形成的三个主要阶段，每个阶段都有微量元素的微幅振荡分带叠加。该方法在黄铁矿和其他硫化物薄层的同位素和元素研究中具有重要的潜在应用价值。
Pyrite is common sulfide mineral involved in the formation of various ores and hydrothermal and biogenetic activities, and its S isotopic ratios and trace element contents and their spatial distribution have been recorded in the processes of these events. We established simultaneous analyses of 34S/32S ratios and trace element contents of pyrite using nanometer-scale secondary ion mass spectrometry (NanoSIMS). Firstly, the images of S (34S−), As (75As−), Se (80Se−), Cu (63Cu32S−), Au (197Au−) and Pb (208Pb32S−) of pyrite were acquired by rastering areas ranging from 20 × 20 μm2 to 40 × 40 μm2 using a Cs+ beam of 7–10 pA with a diameter of ∼250 nm. Then, the 34S/32S ratios (32S− measured by using a Faraday cup and 34S− measured by using an electron multiplier) and the concentrations of these trace elements of the individual layers of the zoned pyrite grains were simultaneously measured in spot analysis mode, by rastering the same current over an area of 2 × 2 μm2. The 34S/32S ratios were calibrated for matrix effects with pyrite standard Balmat or Py1117, and the external reproducibility (1SD) is <0.5‰. The concentrations of trace elements were calibrated using the relative sensitivity factors (RSFs) of As, Se, Cu, Au and Pb, which were determined from pyrite grains with zoning layers. The determined RSFs of As, CuS, Au and PbS are 4.43 ± 0.28, 0.36 ± 0.04, 0.18 ± 0.03 and 38.0 ± 15.1, respectively. Pyrite from Lannigou Carlin type gold deposits was analyzed as an example, and the results revealed three main episodes of its formation, with each superposed by micron-width oscillation zonings of trace elements. This method has important potential applications in isotopic and elemental investigation of thin layers of pyrite and other sulfides.
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影响因子：
0.9
作者：
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通讯作者：
L. Cabri;G. McMahon
影响因子：
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作者：
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作者：
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B. Bühn;R. Santos;M. Dardenne;Claudinei Gouveia de Oliveira
影响因子：
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