Age of biostratigraphic horizons within the Ordovician and Silurian systems
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Abstract
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 40Ar/39 Ar total-fusion method, have been reanalysed using the 40Ar/39Ar age-spectrum method. Conventional K-Ar and total-fusion 40Ar/39Ar 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 40Ar/39Ar 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).
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Age of biostratigraphic horizons within the Ordovician and Silurian systems |
| Series title | Geological Society Memoir |
| DOI | 10.1144/GSL.MEM.1985.010.01.10 |
| Volume | 10 |
| Issue | 1 |
| Year Published | 1985 |
| Language | English |
| Publisher | Geological Society of London |
| Contributing office(s) | Eastern Geology and Paleoclimate Science Center |
| Description | 4 p. |
| First page | 89 |
| Last page | 92 |
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