Naslov
Planktonic foraminiferal turnover and sedimentation at the Middle/Late Eocene boundary (North Adriatic, Croatia)

Autori
Premec-Fuček, Vlasta ; Hernitz Kučenjak, Morana ; Slavković, Renata

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

Izvornik
Abstracts book of the 22nd IAS Meeting of Sedimentology / Vlahović, Igor - Zagreb : Hrvatski geološki institut, 2003, 163-163

Skup
22nd IAS Meeting of Sedimentology

Mjesto i datum
Opatija, Hrvatska, 17.09.2003. - 19.09.2003

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Nije recenziran

Ključne riječi
planktonic foraminifera; Middle/Late Eocene boundary; North Adriatic; Croatia

Sažetak
Deep exploration well Istra more-5 was situated in northern part of Adriatic Sea, at southeast edge of Venetian basin. Middle to Late Eocene deposits, drilled in this exploration well, are presented by monotonous hemipelagic sediments of silty marls occasionally intercalated with silts or fine grained sandstones. These marls contain rich and well preserved planktonic foraminiferal fauna. Plankton/benthos ratio and lithological characteristic of the sediments indicate sedimentation in open deep sea environment. High diversity values in all three associa-tions suggest oligotrophic marine conditions with normal salinity. Planktonic assemblage in P14 Zone is dominated by spinose and muricate individuals indicating warm climate. At the Middle/Late Eocene boundary muricate tropical species become extinct, indicating cooling and were replaced by cooler mid to high-latitude fauna domi-nated by Subbotina angiporoides, S. linaperta and non- spinoze Turborotalia species. Above the boundary, in P15 Zone best adapted species were large globigerinids and nonspinose Turborotalids, but increasing number of spinose species ang globigerinathekids suggest something warmer climate again.

Izvorni jezik
Engleski

Znanstvena područja
Geologija

POVEZANOST RADA