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首页> 外文期刊>Chemical geology >In situ LA-ICPMS U-Pb dating of cassiterite without a known-age matrix-matched reference material: Examples from worldwide tin deposits spanning the Proterozoic to the Tertiary
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In situ LA-ICPMS U-Pb dating of cassiterite without a known-age matrix-matched reference material: Examples from worldwide tin deposits spanning the Proterozoic to the Tertiary

机译：在没有已知的矩阵匹配的参考资料的情况下，在没有已知的矩阵匹配的参考资料的情况下，来自跨国型罐头的例子

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摘要

Cassiterite (SnO2), a main ore mineral in tin deposits, is suitable for U-Pb isotopic dating because of its relatively high U/Pb ratios and typically low common Pb. We report a LA-ICPMS analytical procedure for U-Pb dating of this mineral with no need for an independently dated matrix-matched cassiterite standard. LA-ICPMS U-Th-Pb data were acquired while using NIST 612 glass as a primary non-matrix-matched standard. Raw data are reduced using a combination of Iolite (TM) and other off-line data reduction methods. Cassiterite is extremely difficult to digest, so traditional approaches in LA-ICPMS U-Pb geochronology that utilize well-characterized matrix-matched reference materials (e.g., age values determined by ID-TIMS) cannot be easily implemented. We propose a new approach for in situ LA-ICPMS dating of cassiterite, which benefits from the unique chemistry of cassiterite with extremely low Th concentrations (Th/U ratio of 10(-4) or lower) in some cassiterite samples. Accordingly, it is assumed that Pb-208 measured in cassiterite is mostly of non-radiogenic originit was initially incorporated in cassiterite during mineral formation, and can be used as a proxy for common Pb. Using Pb-208 as a common Pb proxy instead of Pb-204 is preferred as Pb-204 is much less abundant and is also compromised by Hg-204 interference during the LA-ICPMS analyses.
机译：锡沉积物的主要矿石矿物质（SnO2），适用于U-Pb同位素约会，因为其相对高的U / Pb比率和通常低常见的Pb。我们举报了这种矿物质的U-Pb约会的La-ICPMS分析程序，无需独立日期矩阵匹配的卡西捷标准。使用NIST 612玻璃作为主要非矩阵匹配标准的同时获取LA-ICPMS U-TH-PB数据。使用IOLITE（TM）和其他离线数据减少方法的组合减少了原始数据。 Cassiterite非常难以消化，因此在La-ICPMS U-PB地形学中使用良好表征的基质匹配参考资料（例如，由ID-Tims确定的年龄值）的传统方法不能轻易实现。我们提出了一种新的达到咔王景观的新方法，这些方法是在一些咔缕赛样品中具有极低的浓度（Th / U比率）的单独化学性化学。因此，假设在烧结霉中测量的PB-208大多是非辐射性原始的，最初在矿物质形成期间最初掺入Cassiterite中，并且可以用作普通Pb的代理。使用PB-208作为公共PB代理代替PB-204是优选的，因为PB-204不太浓度并且在La-ICPMS分析期间由HG-204干扰损害。

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