Sulfur isotope fractionation in pyrite during laser ablation: Implications for laser ablation multiple collector inductively coupled plasma mass spectrometry mapping
Sulfur isotope fractionation in pyrite during laser ablation: Implications for laser ablation multiple collector inductively coupled plasma mass spectrometry mapping
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激光烧蚀过程中黄铁矿中的硫同位素分馏：激光烧蚀多收集器电感耦合等离子体质谱图的影响
DOI：
10.1016/j.chemgeo.2016.12.037
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发表时间：
2017-02
期刊：
影响因子：
3.9
通讯作者：
Cook Nigel J
中科院分区：
文献类型：
--
作者：
Zhu Zhi Yong;Jiang Shao Yong;Ciobanu Cristiana L;Yang Tao;Cook Nigel J
本研究报告的详细评估如何操作的关键参数影响测量硫同位素使用激光烧蚀多接收器电感耦合等离子体质谱（LA-MC-ICP-MS）。用193 nmArF准分子激光器在不同激光参数条件下分析黄铁矿时，观察到硫同位素分馏，δ 34 S分馏可达2‰。为了理解在测量黄铁矿中S同位素时激光参数影响S同位素分馏的原因，使用扫描电子显微镜（SEM）和透射电子显微镜（TEM）技术来表征黄铁矿烧蚀过程中形成的碎片，即，相的形态和物种形成。结果表明，黄铁矿分解为球状硫铁矿（FeS）和围绕硫铁矿的富硫絮团。由于不同激光参数下产生的陨硫铁球和絮状物的比例不同，测得的δ 34 S值也不同。用LA-（四极杆）-ICP-MS通过直接比较56 Fe与32 S的每秒计数（CPS）比率来评估硫铁矿和S的比例。与黄铁矿相比，天然磁黄铁矿没有分解过程，磁黄铁矿碎屑的粒度几乎是黄铁矿的10倍（磁黄铁矿约5 μm，而黄铁矿< 1 μm）。因此，使用激光烧蚀可能会发生黄铁矿的偏差分析，尽管使用高光栅速度可以最小化这个问题。最后，本文给出了一个利用高栅格速度进行硫同位素填图的实例，扩展了原位硫同位素分析技术的应用范围。这里的结果进行的设置需要获得准确的LA-MC-ICP-MS硫同位素图的黄铁矿的选择的影响。
This study reports a detailed evaluation of how key parameters of operation influence the measurement of sulfur isotopes using laser ablation multiple collector inductively coupled plasma mass spectrometry (LA-MC-ICP-MS). Sulfur isotopes are observed to display a fractionation up to 2‰ δ34S during analysis of pyrite with different laser parameters using a 193 nm ArF excimer laser. In order to understand why the laser parameters affect S isotope fractionation when measuring S isotopes in pyrite, Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM) techniques were used to characterize debris formed during the ablation of pyrite, i.e., morphology and speciation of phases. The results show that pyrite decomposes to two phases: ball-like troilite (FeS) and a sulfur-rich floc-like agglomeration surrounding the troilite. The measured δ34S values vary due to the different proportions of troilite balls and the floc-like material generated under different laser parameters. The proportion of troilite and S was evaluated with a LA-(Quadrupole)-ICP-MS through direct comparison of the counts per second (CPS) ratio of56Fe to32S. In contrast to pyrite, natural pyrrhotite shows no decomposition process and the particle size of the debris from pyrrhotite is nearly 10 times larger than that of pyrite (~ 5 μm for pyrrhotite compared to < 1 μm for pyrite). Therefore, a biased analysis of pyrite may happen using laser ablation although this problem can be minimized using high raster velocity. Last but not least, we provide a case study of S isotope mapping using high raster velocity, which extends the application of thein-situS isotope analysis technique. The results here carry implications for the choice of settings needed to obtain accurate LA-MC-ICP-MS S-isotope maps of pyrite.
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影响因子：
3.9
作者：
Craddock, Paul R.;Rouxel, Olivier J.;Bach, Wolfgang
通讯作者：
Bach, Wolfgang
影响因子：
7.4
作者：
G. Gillson;D. J. Douglas;J. Fulford;Kenneth Halligan;S. Tanner
通讯作者：
G. Gillson;D. J. Douglas;J. Fulford;Kenneth Halligan;S. Tanner
影响因子：
5
作者：
D. Rumble;T. Hoering;J. Palin
通讯作者：
D. Rumble;T. Hoering;J. Palin
影响因子：
0.5
作者：
Zijie Yan;Ruqiang Bao;C. Dinu;Yong Huang;A. Caruso;D. Chrisey
通讯作者：
Zijie Yan;Ruqiang Bao;C. Dinu;Yong Huang;A. Caruso;D. Chrisey
影响因子：
5
作者：
Ding, T;Valkiers, S;Krouse, R
通讯作者：
Krouse, R