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Publication Detail
A simple method for in-situ U-Th-He dating
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Journal Article
  • Authors:
    Vermeesch P, Sherlock SC, Roberts NMW, Carter A
  • Publication date:
    15/02/2012
  • Pagination:
    140, 147
  • Journal:
    Geochimica et Cosmochimica Acta
  • Volume:
    79
  • Status:
    Published
  • Print ISSN:
    0016-7037
Abstract
This paper presents a significantly simplified method for in-situ U-Th-He dating removing the need to know any absolute concentrations. This is done by calculating the normalised U, Th, and He concentrations of a conventionally dated calibration standard from its measured Th/U ratio and known U-Th-He age, and scaling these concentrations to the raw U, Th, and He signals of the sample. The Th/U ratio of the standard can be determined from its measured 208Pb/ 206Pb ratio, removing the need to use NIST glass as a reference material. We introduce an LA-ICP-MS-based method to correct for variable ablation depths between the standard and the unknown, using the strength of the ablated 29Si signal. Finally, we propose a pseudo-depth profile method to assess the effects of compositional zoning on the accuracy of in-situ U-Th-He data. The effectiveness of the proposed method has been demonstrated on three samples of gem-quality Sri Lanka zircon, which yield ages that are in agreement with previously published conventional U-Th-He measurements. © 2011 Elsevier Ltd.
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