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- W4234861880 abstract "Summary Three samples that have a bearing on the age of horizons within the Ordovician and Silurian systems, two previously dated by the conventional K-Ar method and one by the 40 Ar/ 39 Ar total-fusion method, have been reanalysed using the 40 Ar/ 39 Ar age-spectrum method. Conventional K-Ar and total-fusion 40 Ar/ 39 Ar ages can always be questioned because of the relative ease with which the K-Ar system can be disturbed, either thermally or chemically (i.e. Dalrymple & Lanphere 1969; Clauer et al. 1982). The 40 Ar/ 39 Ar age-spectrum method has the potential for identifying disturbed K-Ar systems (i.e. Berger 1975; Harrison & McDougall 1980). The authors feel that the age-spectrum data from these samples are significant because the previous results for these samples have been questioned in recently proposed Palaeozoic time-scales because of a possible disturbance of the K-Ar isotopic system (i.e. Gale et al. 1979, 1980; Gale 1982)." @default.
- W4234861880 created "2022-05-12" @default.
- W4234861880 date "1985-01-01" @default.
- W4234861880 modified "2023-09-28" @default.
- W4234861880 title "Age of biostratigraphic horizons within the Ordovician and Silurian systems" @default.
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- W4234861880 doi "https://doi.org/10.1144/gsl.mem.1985.010.01.10" @default.
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