Open Access
Table 1
K-Ar ages of glauconites. Age calculations are based on the decay and abundance constants from Steiger and Jäger (1977). Analyzed grains were in situ unweathered glauconite without contamination of micas.
| Sample number | Lab. sample | Weight molten (g) | K2O (wt.%) | 40Ar* (%) | 40Ar* (1014at/g) | Age ± 2 (Ma) |
|---|---|---|---|---|---|---|
| GL-CRA (I) | lab 1658 | 0.02117 | 5.730 | 71.05 | 2.744 | 54.4 ± 0.8 |
| GL-CRA (II) | lab 1659 | 0.02226 | 5.730 | 67.47 | 2.696 | 53.6 ± 0.8 |
| GL92-A64 (I) | lab 1666 | 0.03230 | 6.630 | 81.75 | 3.095 | 53.1 ± 0.8 |
| GL92-A64 (II) | lab 1672 | 0.02226 | 6.630 | 78.33 | 3.121 | 52.8 ± 0.7 |
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