Trace element analyses of fluid inclusions using laser ablation ICP-MS
Trace element analyses of fluid inclusions using laser ablation ICP-MS
复制标题
使用激光烧蚀 ICP-MS 对流体包裹体进行微量元素分析
DOI：
10.1016/j.sesci.2017.12.001
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发表时间：
2018-03
期刊：
影响因子：
--
通讯作者：
Jie Li
中科院分区：
文献类型：
--
作者：
Cong-ying Li;Yu-hang Jiang;Yan Zhao;Chan-chan Zhang;Ming-xing Ling;Xing Ding;Hong Zhang;Jie Li
流体包裹体是岩浆作用、成矿作用和流体渗流混合过程中流体-岩石相互作用的物理化学条件的记录。激光烧蚀电感耦合等离子体质谱（LA-ICP-MS）是一种用于微米级小样品现场分析的强大工具。本文报道了LA-ICP-MS方法对流体包裹体的现状分析。LA-ICP-MS分析流体包裹体通常采用NIST SRM玻璃和23na作为外标和内标，尽管23na微测估计的RSD约为20%，甚至更差，但对于大多数ICP-MS来说Na的背景信号较高。利用表征良好的天然流体包裹体，我们展示了RESOlution S-155激光系统分析石英中的流体包裹体并测定微量元素浓度。Resonetics RESOlution S-155激光的优点是其电动Z台可以适应样品高度或样品地形的变化以及样品之间的高度差，这对于分析石英中的流体包裹体非常重要。我们的研究结果表明，激光能量密度为25 J/cm2，激光脉冲重复频率通常在6 ~ 10 Hz之间，以避免石英的裂纹并获得足够的结果。对于LA-ICP-MS分析，35cl含量的不确定度约为40%，因为35cl信号的强度比23na信号的强度低三个数量级。尽管如此，除了23na外，它仍然是流体包裹体分析的有用参考。该技术可以应用于一系列热液地质问题，包括确定成矿盐水的来源和矿床沉积过程，绘制变质和热液流体的省份和路径，以及限制流体-岩石反应和流体混合的影响。
Fluid inclusions are records of the physico-chemical conditions of fluid–rock interactions during magmatism, mineralization and fluid percolation and mixing processes. Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) is a powerful tool forin situanalyses of small samples at micrometer levels. Here we reportin situanalyses of fluid inclusions using LA-ICP-MS method. NIST SRM glasses and23Na are generally used as external and internal standards for LA-ICP-MS analysis of fluid inclusion, respectively, although the RSD of microthermometric estimation of23Na is about 20% and even worse, the background signal of Na is high for most ICP-MS. Using well-characterized natural fluids inclusion, we show that RESOlution S-155 laser system analyze fluid inclusions in quartz and determine the trace element concentrations. Resonetics RESOlution S-155 laser has the advantage of the motorized Z stage can be used to accommodate variation of sample height or sample topography and height difference between samples, which is very important for analyzing the fluid inclusion in quartz. Our results suggest laser energy density is 25 J/cm2, laser pulse repetition rates are commonly between 6 and 10 Hz to avoid the fissuring of quartz and obtain adequate results. For this LA-ICP-MS analysis, uncertainty on35Cl content is around 40% because of intensity of the35Cl signal is three orders of magnitude less intense than the intensity of the23Na signal. Nevertheless, it is still a useful reference for fluid inclusion analyses in addition to23Na. This technique can be applied to a range of hydrothermal geology problems, including determining the origins of ore forming brines and ore deposition processes, mapping metamorphic and hydrothermal fluid provinces and pathways, and constraining the effects of fluid–rock reactions and fluid mixing.
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