Naslov
From (Neo) Tethys to Peritethys:the role of the Priabonian index species Nummulites fabianii from NE Slovenia and N Croatia
(From (Neo) Tethys to Peritethys:the role of the Priabonian index species Nummulites fabianii from NE Slovenmian and N Croatia.)

Autori
Ćosović, Vlasta ; Drobne, Katica

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

Izvornik
Zbornik povezetkov/Book of abstracts / Novak, Matevž ; Rman, Nina - Ljubljana : Geološki zavod, 2018, 102-102

ISBN
978-961-6498-60-9

Skup
5. slovenski geološki kongres

Mjesto i datum
Velenje, Slovenija, 03.10.2018. - 05.10.2018

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Nummulites, Late Eocene, Seaway

Sažetak
The area of NE Slovenia and N Croatia, during the Late Eocene, paleogeographically speaking, was a zone where two regions, epicontinetal Peritethys, a predecessor sea of Paratethys and Mediterranean Tethys, were very close. A few studies about the role of Periadriatic tectonic zone as a seaway or migration route are available. The Priabonian age of deposits in four sections (Povlak, Šoštarica, Ravna gora and Višnjica, Ćosović et al., 2000a, b ; Drobne et al., 2000a, b) is defined by foraminifera (larger benthic, LBF and planktonic) and coccolithophorids. Diversified assemblages composed of LBF (Glomalveolina ungaroi, Sphaerogypsina globula, Nummulites fabianii, N. retiatus, N. incrassatus, Operculina gomezi, O. alpina, Halkyadria minima, Chapmanina gassinensis, Pellatispira madiraszi, Haddonia sp., Discocyclina radians, D. dispansa, Asterocyclina sp.) suggest deposition in euphotic to mesophotic, oligotrophic sea where, occasionally, algal/sea grasses covered sea- bottom. Distribution and diversity of corals, solitary and massive colonial confirmed that. Sediments where parallel (flat tests of discocylinids) and contact imbrications, along with abraded tests (ultimate whorl with minute fissures, test poles are truncated) occur, imply post-mortem transport of empty tests. In solving paleogeographic “puzzle” of the role of area, a presence of reticulate Nummulites, a distinctive group frequently used in biostratigraphy (Serra-Kiel et al., 1998) is important. The relative proportion of the inflate morphologies of N. fabianii test with diameter to thickness (D/T) ratio from 1.1 to 1.5 and flat tests of N. retiatus with D/T ratio from 2.1 to 3.0 indicates different hydrodynamic conditions. Even outer shelf facies recorded by greater proportion of flat nummulitids with parallel-oriented thin discocyclinids and surface dwelling planktonic, allowed foraminiferal migration and possible communication between two regions.

Izvorni jezik
Engleski

Znanstvena područja
Geologija

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