Zeolites in the Smrekovec volcaniclastic rocks, northern Slovenia


  • Polona Kralj




Volcaniclastics from the Upper Oligocene Smrekovec volcanic complex comprise autoclastic deposits, locally resedimented hyaloclastite deposits, pyroclastic deposits, volcaniclastic debris flow and turbidite ash flow deposits and reworked turbidite ash flow deposits. Particularly coarser-grained rocks underwent changes in mineralogy characterised by the development of zeolites and related new-formed silicate minerals: albite, quartz, chlorite, interlayered chlorite/smectite, prehnite, pumpellyite and sphene. Among zeolites, laumontite is the most widespread mineral; it primarily occurs in veins and as interstitial cement but may also replace volcanic glass, pyrogenetic plagioclases and fine-grained matrix. Other zeolites - heulandite, heulandite-clinoptilolite, analcime, stilbite, yugawaralite and thomsonite are less abundant, and are more localised in occurrence. The formation of zeolites and other new-formed silicate minerals is related to hydrothermal conditions generated by emplacement of high-level intrusive bodies into soft, water-saturated sediments. Kr


How to Cite

Kralj, P. (1997). Zeolites in the Smrekovec volcaniclastic rocks, northern Slovenia. Geologija, 40(1), 247–281. https://doi.org/10.5474/geologija.1997.012




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