Abstract
Deposits of natural volcanogenic-sedimentary zeolites have been found for the first time within the Kempendyai depression located in the south-west of the Vilyui synecline (Siberian platform). Zeolitebearing rocks occur in 5-13-m-thick layers and are confined to Upper Devonian and Lower Carboniferous sediments that make up the flanks of salt-dome structures. The content of the clinoptilolite-heulandite group minerals in these layers is 70-98%. The rest of the rock (2-30%) consists of quartz, feldspars, biotite, clay minerals, and carbonates. The zeolitic rocks have formed as a result of volcanic glass transformation and belong to a volcanogenic-sedimentary late-diagenetic type.
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