Rapid Determination of Trace Element Compositions in Peridotites by LA-ICP-MS Using an Albite Fusion Method
Rapid Determination of Trace Element Compositions in Peridotites by LA-ICP-MS Using an Albite Fusion Method
复制标题
使用钠长石熔融法通过 LA-ICP-MS 快速测定橄榄岩中的痕量元素成分
DOI：
10.1111/ggr.12240
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发表时间：
2019
影响因子：
3.8
通讯作者：
Huang Fang
中科院分区：
文献类型：
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作者：
Zhang Shenyang Y;Zhang Hongluo L;Hou Zhenhui;Ionov Dmitri A;Huang Fang
描述了使用 LA-ICP-MS 测定橄榄岩微量元素组成的快速样品制备程序。将橄榄石粉末与钠长石熔合在钼-石墨组件中以获得均匀的玻璃。熔化过程的最佳条件（在 1500–1550°C 下加热 10–15 分钟，样品与助熔剂的比例为 1:2）受到两种 USGS 参考材料 PCC-1 和 DTS-2B 的熔化实验的限制。 PCC-1 和 DTS-2B 淬火玻璃中第一系列过渡元素 Ba 和 Pb 的质量分数与已发表的数据一致，RSD 在 10% 以内。采用我们的方法和传统溶液 ICP-MS 对来自中国东部的三种尖晶石橄榄岩捕虏体进行了分析。与溶液ICP-MS相比，我们的方法对于大多数元素的相对偏差在10%以内，而对于REE、Ta、Pb、Th和U，相对偏差在20%以内。特别是，挥发性元素（例如，Pb和Zn）保留在玻璃中。与传统的湿化学消化相比，我们的方法更快。其他优点是样品完全融合，特别适用于含有耐酸矿物（尖晶石和金红石）的样品，以及玻璃的长期保存，允许使用微束技术进行无限制的重复测量。同样的方法可用于分析其他地幔岩石，例如榴辉岩和辉石岩。
A rapid sample preparation procedure is described to determine trace element compositions of peridotites using LA‐ICP‐MS. Peridotite powders were fused with albite in a molybdenum–graphite assembly to obtain homogeneous glasses. Best conditions for the fusion procedure (heating at 1500–1550 °C for 10–15 min with a sample‐to‐flux ratio of 1:2) were constrained with melting experiments on two USGS reference materials, PCC‐1 and DTS‐2B. Mass fractions of first series transition elements, Ba and Pb, in quenched glasses of PCC‐1 and DTS‐2B are consistent with published data within 10% RSD. Three spinel peridotite xenoliths from eastern China were analysed following both our method and conventional solution ICP‐MS. Compared with solution ICP‐MS, the relative deviations of our method for most elements were within 10%, while for the REE, Ta, Pb, Th and U, the relative deviations were within 20%. In particular, volatile elements (e.g., Pb and Zn) are retained in the glass. Compared with conventional wet chemistry digestion, our method is faster. Additional advantages are complete sample fusion, especially useful for samples with acid‐resistant minerals (spinel and rutile), and long‐term conservation of glasses allowing unlimited repeated measurements with microbeam techniques. The same approach can be used for analyses of other mantle rocks, such as eclogites and pyroxenites.