Naslov
Coarsening-Upward Cycles - Sedimentary Signature of the Sea-Level Changes

Autori
Bucković, Damir

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

Izvornik
2. hrvatski geološki kongres / Vlahović, Igor ; Biondić, Ranko - Zagreb : Hrvatski geološki institut, 2000

Skup
2. hrvatski geološki kongres

Mjesto i datum
Cavtat, Hrvatska, 17.05.2000. - 20.05.2000

Vrsta sudjelovanja
Poster

Vrsta recenzije
Domaća recenzija

Ključne riječi
coarsening-upward cycles; sea-level changes; carbonate platforms

Sažetak
During Mesozoic greenhouse periods (VEEVERS, 1990), amplitudes of the eustatic fourth-to-fifth-order sea-level changes were less than 10 metres (GROTZINGER, 1986; TUCKER, 1993). As the fair-weather wave-base on carbonate platforms in geological past was positioned at an average depth of five metres (TUCKER & WRIGHT, 1990), each fourth-to-fifth order sea level oscillation could lead to "emergence" of the sea bottom (with average depth of 10 m) above the fair-weather wave base. This way sedimentary conditions changed periodically from low energy subtidal to higher energy subtidal, what consecutively and periodically changed the limestone structural types from muddy to more grainy ones. Depending upon the third-order sea level changes, during periods of no local tectonic movements, in platform sedimentary environments, these sea level changes could produce successions of coarsening-upward cycles with grainy peloid-bioclastic or ooid upper member.

Izvorni jezik
Engleski

Znanstvena područja
Geologija

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