LA-ICP-MS/MS†富稀土古近系辉钼矿Re-Os原位年代学

IF 3.1 2区化学 Q2 CHEMISTRY, ANALYTICAL

Journal of Analytical Atomic Spectrometry Pub Date : 2025-04-23 DOI:10.1039/D5JA00030K

Stijn Glorie, Jay M. Thompson, Sarah E. Gilbert and A. Kate Souders

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引用次数: 0

摘要

LA-ICP-MS/MS的原位Re-Os地质年代学先前通过将Os与CH4或N2O反应气体反应来证明。然而，在这两种反应中，有一小部分Re母同位素也会发生反应，这可能导致187Re对187o产生明显的等压干扰，特别是对于没有放射成因生长的年轻样品。在这里，我们提出了一个实验室间比较，并比较了三种反应气体混合物（CH4 + H2 + He， N2O和N2O + He），旨在对宾厄姆峡谷和亨德森矿床的古近系（66-23 Ma）辉钼矿进行可靠的测年。CH4与H2气体混合反应灵敏度最高，而N2O和He气体缓冲Re反应。综合考虑，采用N2O + He反应气体的分析方法最适合测定古近系辉钼矿年龄，Bingham的年龄精度为2.6%，Henderson的年龄精度为5.8%。对于年龄较大的>；1 Ga辉钼矿，CH4 + H2 + He可以给出相对较好的年龄精度。

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In situ Re–Os geochronology of Re-rich Palaeogene molybdenite by LA-ICP-MS/MS†

In situ Re–Os geochronology by LA-ICP-MS/MS was previously demonstrated by reacting Os with CH₄ or N₂O reaction gasses. However, for both reactions, a minor proportion of the Re parent isotope also reacts, potentially leading to significant isobaric interferences of ¹⁸⁷Re on ¹⁸⁷Os, especially for young samples with little radiogenic in-growth. Here we present an interlaboratory comparison and compare three reaction gas mixtures (CH₄ + H₂ + He, N₂O and N₂O + He) with the aim to robustly date Palaeogene (66–23 Ma) molybdenite from the Bingham Canyon and Henderson deposits. CH₄ mixed with H₂ gas gives the highest sensitivity, while N₂O and He gas buffer Re reaction. On balance, the analytical method involving N₂O + He reaction gas is most suitable for dating Palaeogene molybdenite, resulting in age precision of 2.6% for Bingham and 5.8% for Henderson. For older, >1 Ga molybdenite, CH₄ + H₂ + He may give comparatively better age precision.