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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