Podrobnosti záznamu

Název
    Record of sea-level fall in shallow-water hemipelagic strata: case study and numerical modelling
Autor
    Laurin, Jiří
    Vodrážka, Radek
Jazyk
    anglicky
Typ dokumentu
    článek v periodiku
Zdrojový dokument - seriál
    Terra Nova
Svazek/č.
    Roč. 22, č. 2
Strany
    7
Rok
    2010
Výraz tezauru
    BOHEMIAN CRETACEOUS BASIN, WESTERN INTERIOR USA, CYCLES, PARASEQUENCES, STRATIGRAPHY, DEPOSITION, SEQUENCES, MARINE
Klíčové slovo
    Case
    Fall
    Hemipelagic
    Modelling
    Numerical
    Record
    Sea-level
    Shallow-water
    Strata
    Study
Abstrakt (anglicky)
   Hemipelagic rhythmites of the Bohemian Cretaceous Basin and two-dimensional numerical modelling of coexisting hemipelagic and siliciclastic depositional systems reveal important details on hemipelagic sequence stratigraphy. Lowstand systems tracts of c.400 ka sequences are marked by distinct (up to 100 ka) phase lags between maxima in bottom shear stress (omission surfaces) and maxima in siliciclastic deposition (mudstone intercalations) in the shallowest zone of this hemipelagic setting. Importantly, sediment redistribution caused by local differences in bathymetry induces up to 100 ka shifts in lithological markers, thus changing the hemipelagic expression of sea-level falls. Both results underscore the frequently neglected fact that lithological and geochemical data on siliciclastic fluxes (e.g. quartz contents, Ti/Al) provide nonlinear proxies of eustatic and relative sea-level changes. Hemipelagic records of climatic and orbital forcings can be markedly distorted in phases and mag
   nitudes.
Přispěvatel
    Česká geologická služba
Kód přispěvatele
    ČGS (RIV)
Zdrojový formát
    R
Datum importu
    15. 10. 2014