This study explains the relations between the depositional environment of a zeolitic tuff unit and its diagenesis. It gives new ideas of the juvenile phreatomagmatic origin of the zeolitic unit with its bentonitic cap rock, and finds that the diagenetic alteration of the volcanic ash deposition in a hot hydrologic system is penecontemporaneous and not epigenetic. | Geology and diagenesis of a zeolitic Foça tuff unit deposited in a Miocene phreatomagmatic lacustrine environment (western Anatolia)
