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Issue 7, 2015
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An in situ technique for (U–Th–Sm)/He and U–Pb double dating

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Abstract

We report on a new laser-based technique for rapid, quantitative and automated in situ double dating (U–Pb and (U–Th–Sm)/He) of minerals, for applications in geochronology, thermochronology and geochemistry. In situ laser microanalysis offers several advantages over conventional bulk crystal methods in terms of spatial resolution, productivity, and safety. This new approach/methodology utilizes an interoperable and integrated suite of analytical instruments including a 193 nm ArF excimer laser system, quadrupole ICP-MS, quadrupole helium mass spectrometry system and swappable flow-through and ultra-high vacuum analytical chambers. We describe the analytical protocols for zircon analysis including grain mounting in Teflon, parameters for parent and daughter isotopic measurement, and standard development, and provide a freeware application for determining (U–Th–Sm)/He ‘pairwise’ ages from analytical data. The in situ double dating method described is applied to the Ellendale lamproite pipe and country rocks, Western Australia and successfully replicates conventional U–Pb and (U–Th–Sm)/He age variations determined previously by conventional techniques.

Graphical abstract: An in situ technique for (U–Th–Sm)/He and U–Pb double dating

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Publication details

The article was received on 13 Mar 2015, accepted on 01 Jun 2015 and first published on 01 Jun 2015


Article type: Paper
DOI: 10.1039/C5JA00085H
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J. Anal. At. Spectrom., 2015,30, 1636-1645
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    An in situ technique for (U–Th–Sm)/He and U–Pb double dating

    N. J. Evans, B. I. A. McInnes, B. McDonald, M. Danišík, T. Becker, P. Vermeesch, M. Shelley, E. Marillo-Sialer and D. B. Patterson, J. Anal. At. Spectrom., 2015, 30, 1636
    DOI: 10.1039/C5JA00085H

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