Table DR5. Weathering history and landscape evolution of Western Ghats (India) from ⁴⁰Ar/³⁹ Ar dating of supergene K–Mn oxides

Analytical results obtained for each irradiated and dated cryptomelane grains analysed using laser energy (in power %) of the spectrometer Argus VI.The concentrations (in molar volume, V) of ³⁶Ar, ³⁷Ar, ³⁸Ar, ³⁹Ar and ⁴⁰Ar with their respective 1σ error are provided for each step heating. The amount of ⁴⁰Ar* (%), of ³⁹Ar released (% ³⁹Ar) and the K/Ca ratio (derived from ³⁹Ar/³⁷Ar) are also given, and also the sample parameters and the irradiation constants. Finally, this table show ratios ⁴⁰Ar*/³⁹Ark used to determine the corresponding apparent ages with their associated 2σerror. The different J-Factor values are also provided for each irradiated grains.