Abstract
The application of microscopic and especially diffractometric methods to the geochemical study of Oligocene lacustrial deposits in north-western Anatolia (Turkey) has enabled us to discover the presence of “analcite” in a vast range of lithologic varieties. It seems to be well established that the neogenesis of this analcite has arisen from the soluble parts of trachytic ash, and especially from the β-albite-rich andesitic ash, in the chemico-detritic muds satiated with confined sodic water. Various geneses have been added to the primary formation of analcite — such as the aggradation of montmorillonites as well as the neoformation of α-albite and of silica formed at different stages of the diagenesis from elements dissolved from the same original volcanic matter. Generally speaking, it appears that the preferential neoformation of any zeolite depends less on the chemical nature of volcanic glass than on relative concentrations of ions and of molecules present at the exact moment zeolite formation begins to take place.
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