Timing of weathering-induced alteration and manganese deposits in Western Australia:  evidence from K/Ar and 40Ar/39Ar dating

McDougall, Ian; Chivas, A

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Timing of weathering-induced alteration and manganese deposits in Western Australia: evidence from K/Ar and 40Ar/39Ar dating

Date

1999

Authors

McDougall, Ian

Chivas, A

Publisher

Economic Geology Publishing Company

Abstract

Under particular climatic conditions, tetravalent K-Mn oxides can be formed during terrestrial chemical weathering of Mn ores. In this study the results of K/Ar and 40Ar/ 39Ar dating of weathering-related K-Mn oxides (mainly cryptomelane (K,Ba)Mn 8O 16 ·