Abstract
The Anatolian Tertiary and especially the Neogene have some geological series with analcime as the principal rock-forming mineral. Sedimentation basins receiving material in suspension and in solution permit the authigenesis of analcime dolomite, calcite and opal(C-T). Analcimes formed by hydrothermal alteration on the ocean floor, after the pillow lava and diabasic dyke complexes of ophiolites, can form a source of detrital analcime when they are on the continental medium. Continental alteration of the pillow lavas and diabasic dykes permits the formation of solutions suitable in composition for analcime authigenesis. Analcimes formed in these environments are particularly related to the silica content of these media. Principal clay minerals formed with analcimic formations are smectites and (14 s—14 c) mixed layers. Illite, chlorite and corrensite are also present in smaller quantities.
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