Sr isotopic data of Holocene glauconitic pellets suggest a twofold glauconitization process that is strongly linked to the detrital clay minerals from surrounding mud which act as precursors until the K2O content of the glauconitic material reaches 4%. Above that, a detectable sea-water influence becomes progressively predominant. The process seems to start with a dissolution-crystallization reaction in equilibrium with the precursor, which is followed by a maturation process in isotopic equilibrium with sea-water Sr, while the K2O content increases further. This chemical evolutionary process may also occur for other types of clay minerals.

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