Naslov
Naslage s analcimom u Poljanskoj (Slavonija, sjeverna Hrvatska)
(Analcime bearing deposits in Poljanska, Slavonia, Northern Croatia)

Autori
Šćavničar, Stjepan ; Krkalo, Eugen ; Šćavničar, Biserka ; Halle, Radovan ; Tibljaš, Darko

Izvornik
Rad JAZU, Razred za prirodne znanosti (0351-3297) 404 (1983), 19; 137-169

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
analcim; zeoliti; dolomit; Poljanska; Slavonija
(analcime; zeolite; dolomite; Poljanska; Slavonia)

Sažetak
Analcime bearing deposits of the Helvetian in Poljanska (southern Papuk, S1avonia) have been investigated. They are developed in two horizons, named »productive horizons« because of their use in cement industry. They have a hybrid composition, owing to the mixture of carbonate sediments (dolomite), pyroclastic and volcanoclastic material of the neighbouring volcanoes and terrigenous detritus derived from older crystalline rocks of the Slavonian mountains. Among different sedimentary members one could determine penecontemporary dolomicrites, miscellaneous pelites (shales, dolomitic marls), tuffs, tuffites and tuffaceous sandstones - all containing analcime crystals as an important component, dispersed or in aggregates. Frequently, monomineral layers or laminae of analcime are formed and interstratified among different sedimentary members. Microscopic, X-ray and chemical investigations suggest that analcime was formed by alteration of volcanic glass, as well as the other silicates, in the shallow water of an unsheltered saline alcaline , lake, under conditions of increased aridity and closure of the lake.

Izvorni jezik
Hrvatski

Znanstvena područja
Geologija

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