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    YBCs sanidine: A new standard for 40Ar/39Ar dating

    Access Status
    Fulltext not available
    Authors
    Wang, F.
    Jourdan, Fred
    Lo, C.
    Nomade, S.
    Guillou, H.
    Zhu, R.
    Yang, L.
    Shi, W.
    Feng, H.
    Wu, L.
    Sang, H.
    Date
    2014
    Type
    Journal Article
    
    Metadata
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    Citation
    Wang, F. and Jourdan, F. and Lo, C. and Nomade, S. and Guillou, H. and Zhu, R. and Yang, L. et al. 2014. YBCs sanidine: A new standard for 40Ar/39Ar dating. Chemical Geology. 388: pp. 87-97.
    Source Title
    Chemical Geology
    DOI
    10.1016/j.chemgeo.2014.09.003
    ISSN
    0009-2541
    School
    Department of Applied Geology
    URI
    http://hdl.handle.net/20.500.11937/40275
    Collection
    • Curtin Research Publications
    Abstract

    The 40Ar/39Ar dating technique is based on neutron fluence monitors (standards). Recent investigation demonstrates that currently used standards are not as homogenous as believed and new standards are needed (Philips and Matchan, 2013). In this study, we report a new sanidine standard, YBCs, collected from a phonolite at Yabachi in Tibet, China, for single-grain 40Ar/39Ar dating. Aliquots were distributed to four international laboratories for analysis and intercalibration. The results show that YBCs crystals are homogenous in K content, 40Ar*/39ArK (F-value) and age at the single grain level. The standard deviations of the F-value and age have small ranges from 0.29% to 0.53% and from 0.42% to 0.52%, respectively. These show that YBCs is a suitable standard for 40Ar/39Ar geochronology. The calibrated age of YBCs is 29.286 ± 0.206 Ma, or neglecting the error in the decay constant, 29.286 ± 0.045 Ma. Finally, the intercalibration factors (which allow direct comparison between standards) between YBCs and FCs, GA1550, ACs and HB3gr are calculated as: R YBCs/FCs = 1.044296 ± 0.003968, R YBCs/GA1550 = 0.291261 ± 0.001148 R YBCs/ACs = 24.443066 ± 0.068432 and R YBCs/HB3gr = 0.020312 ± 0.000885. These values can be used to compare YBCs with other standards directly.

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