Naslov
Fossils and microfacies of Bellerophon Formation from the Vojsko Plateau

Autori
Sremac, Jasenka ; Jurkovšek, Bogdan ; Aljinović, Dunja ; Kolar Jurkovšek, Tea

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, ostalo

Izvornik
Međunarodni znanstveni skup 100-ta obljetnica rođenja akademkinje Vande Kochansky-Devidé/International scientific meeting 100th birth anniversary of Vanda Kochansky-Devidé, full member of Academy. Knjiga sažetaka / Abstracts / Mauch Lenardić, Jadranka ; Hernitz Kučenjak, Morana ; Premec Fućek, Vlasta ; Sremac, Jasenka - Zagreb : Hrvatska akademija znanosti i umjetnosti (HAZU), 2015, 78-79

ISBN
978-953-347-023-8

Skup
Međunarodni znanstveni skup 100-ta obljetnica rođenja akademkinje Vande Kochansky-Devidé/International scientific meeting 100th birth anniversary of Vanda Kochansky-Devidé, full member of Academy

Mjesto i datum
Zagreb, Hrvatska, 09.04.2015. - 11.04.2015

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Domaća recenzija

Ključne riječi
fossils; microfacies; Late Permian; Bellerophon Formation; Slovenia

Sažetak
Late Permian Bellerophon Formation in Western Slovenia is exposed at the Vojsko plateau. It is ca. 130 m thick sequence composed of dolomites and limestones. The uppermost limestone interval is particularly interesting due to the sponge buildups situated just below the Permian/Triassic boundary. Small sponge biolithites represent a local facies variety within the bioclastic wackestones and packstones. Generally, three microfacies types appear within these deposits: Facies A: sponge bafflestone with large chambered demosponges (Colospongia, Amblysiphonella), smaller Demospongea and Calcarea. Sponges are preserved in situ but fine skeleton microstructure is partly destroyed by recrystallization (SREMAC et al., 2014). Facies B: packstone composed of bioclastic material and large biomicrite lithoclasts or coated bioclasts. Bioclasts are irregularly shaped and poorly sorted. Fossil fragments are more diverse than in the Facies C (echinoderms, foraminifers, algae, brachiopods and gastropods). Algal lithoclasts are particularly common. These sediments were probably deposited close to the sponge buildups. Facies C: packstone/wackestone limestone type composed mainly of echinoderm fragments and foraminifers. Brachiopod shells, bivalves and algal fragments are rarely present. Micritic matrix is often intensively recrystallized and dolomitized. These deposits indicate a lagoonal or shallow marine restricted environment, away from sponge buildups. Sponge fragments are generally scarce in Facies B and C, which confirms their limited occurrence and quick burial. The whole sequence was deposited on a shallow inner shelf/ramp in equatorial part of the Western Palaeotethys. Sedimentary basin was partly isolated from the main ocean currents, which enabled the survival of sensitive filter feeders during the stress events at the Guadalupian/Lopingian Boundary and in the Late Permian.

Izvorni jezik
Engleski

Znanstvena područja
Geologija

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