Naslov
The Kimmeridgian Tidal-Bar Calcarenite Facies in Western Istria (Western Croatia)

Autori
Tišljar, Josip ; Velić, Ivo

Izvornik
Facies (0172-9179) 17 (1987); 277-284

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

Ključne riječi
Microfacies; Tidal-bar facies; Biocalciarenite; Biocalcirudite; Emersion; Carbonate platform; Western Istria; Croatia; Upper Jurassic (Kimmeridgian)
(Microfacies; Tidal-bar facies; Biocalciarenite; Biocalcrudite; Emersion; Carbonate platform; Western Istria; Croatia; Upper Jurassic (Kimmeridgian))

Sažetak
The Upper Jurassic shallowmarine limestones of western Istria are composed of three main facies: 1. peloid packstone/grain-stone deposited in a shallow subtidal environment; 2. oolitic coated bioclastic calcarenite and 3. mudstone with desiccation cracks, originating in a near-shore environment ranging from shallow subtidal to supratidal or meteoric vadose zone. The calcarenite facies is characterized by thickbedded to massive bioclastic grainstones/rudstones with cross-bedding and, at places, also large symmetrical wave ripples. It is composed of well-sorted tangential ooids and variable amounts of large coated bioclasts of Cladocoropsis and other hydrozoans, corals, pachydont bivalves and test of benthic foraminifers. Almost all the larger bioclasts are coated by micrite envelopes. The Kimmeridgian grainstone/rudstone facies in Western Istria has been interpreted as tidal bar and winnowed carbonate sands.

Izvorni jezik
Engleski

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