Podrobnosti záznamu

Název
    Magnetic susceptibility and spectral gamma logs in the Tithonian-Berriasian pelagic carbonates in the Tatra Mts (Western Carpathians, Poland): Palaeoenvironmental changes at the Jurassic/Cretaceous boundary
Autor
    Grabowski, J.
    Hejnar, J.
    Koptíková, Leona
    Krzemiński, L.
    Pszczółkowski, A.
    Schnabl, Petr
    Schnyder, J.
    Sobien, K.
Jazyk
    anglicky
Typ dokumentu
    článek v odborném periodiku
Zdrojový dokument - seriál
    Cretaceous Research
Svazek/č.
    Roč. 43, June 2013
Strany
    s. 1-17
Rok
    2013
Poznámky
    Rozsah: 17 s. : E
Předmětová kategorie
    Berriasian
    Gamma-ray spectrometry
    magnetic susceptibility
    palaeoenvironmental trends
    Tithonian
Klíčové slovo
    Boundary
    Carbonates
    Carpathians
    Changes
    Gamma
    Jurassic/Cretaceous
    Logs
    Magnetic
    Mts
    Palaeoenvironmental
    Pelagic
    Poland
    Spectral
    Susceptibility
    Tatra
    Tithonian-Berriasian
    Western
Abstrakt (anglicky)
   Upper Tithonian-Berriasian pelagic carbonates in the Central Western Carpathians, Tatra Mts (southern Poland), with well-established bio- and magnetostratigraphy, provide excellent possibilities of testing magnetic and geochemical methods as proxies of palaeoenvironmental changes in the Western Tethys at the Jurassic/Cretaceous boundary. Magnetic susceptibility (MS), field spectral gamma-ray (GRS) as well as CaCO3, total organic carbon (TOC), and elemental analyzes were performed in the PoŚrednie III section. MS reveals very good negative correlation with CaCO3 content as well as positive correlation with Al, Zr, Ti and other lithogenic elements and therefore it might be interpreted as a proxy of a detrital input into the basin.
   Abrupt MS variations correlate well with relative sea-level changes and indicate regressive intervals (MS highs) in the upper Tithonian/lowermost Berriasian (M20r to M19n2n) and upper Berriasian (M16n) and transgressive interval (MS low) in the lower to middle Berriasian (M18r to M17r). Long-term MS variations might be linked to a palaeoclimatic-controlled enhanced continental runoff. Geochemical data (P, Th/U, Mn, Cd, Ni, Mo and TOC content) point to a productivity increase and a slight oxygen deficiency in the lower and middle Berriasian, which corresponds to MS low values and typical calpionellid limestone sedimentation. Timing of major palaeoenvironmental turnovers might be correlated also with general palaeoclimatic trends in the Western Tethys and Western Europe: cooling in the late Tithonian followed by a temperature increase throughout the Berriasian and an important humidity increase in the middle Berriasian (M17n).
Přispěvatel
    AV ČR Brno, Geologický ústav
Kód přispěvatele
    AV ČR, GLÚ
Zdrojový formát
    U
Datum importu
    23. 10. 2014