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Six natural molybdenite samples from a range of geological settings, containing 10 ppm Re, were analyzed by 70 μm laser ablation spots, and ages were calibrated by analysis of molybdenite pellets.Contrary to our expectation, weighted average ages obtained were in agreement (within 1%) with conventional age determinations, with fairly good precision (from ~ 1 to 5% 2 depending on Re concentration), suggesting limited or essentially nonexistent decoupling within crystals.Two important implications of this result are that decoupling Re-Os is not universal, and that our new analytical protocol is useful both for dating and for studies of decoupling.The benefit of in situ dating compared to conventional dating is, apart from lower cost and time consumption, the possibility of targeting smaller molybdenite crystals (≥ 100 μm) in thin sections and epoxy mounts.By continuing to use this site, you consent to the use of cookies.We use cookies to offer you a better experience, personalize content, tailor advertising, provide social media features, and better understand the use of our services.To learn more or modify/prevent the use of cookies, see our Cookie Policy and Privacy Policy.Rhenium-osmium (Re-Os) dating of two molybdenite samples from the alkali granite and pegmatite of Ambalavayal in northern Kerala (S.

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Initial tests performed by solution analysis guided the development of the LA-ICP-MS/MS-based protocol.

Analysis of pressed particulate pellets of natural molybdenite was used to assess the protocol with respect to detection limits and precision and accuracy of Re-Os ratios.

The first two analytical runs were focused on the analysis of pressed pellets with a 110 μm spot size to evaluate reproducibility within runs and between runs and to evaluate age precision and accuracy.

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In the third run, a range of molybdenite crystals were targeted using 70 μm spot size, in order to evaluate the protocol on natural materials.

With the introduction of ICP tandem mass spectrometry (MS/MS), it has become possible to control a range of isobaric interferences previously out of reach of quadrupole ICP-MS (Bolea-Fernandez et al. Effective separation is possible because the daughter isotope reacts with a reaction gas and is measured in the so-called mass-shift mode, while the parent isotope does not react and is measured on-mass.



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