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

IF 3.1 2区 化学 Q2 CHEMISTRY, ANALYTICAL
Stijn Glorie, Jay M. Thompson, Sarah E. Gilbert and A. Kate Souders
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引用次数: 0

Abstract

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.

LA-ICP-MS/MS†富稀土古近系辉钼矿Re-Os原位年代学
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。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
6.20
自引率
26.50%
发文量
228
审稿时长
1.7 months
期刊介绍: Innovative research on the fundamental theory and application of spectrometric techniques.
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