Carbon and oxygen isotope record across Pridoli to Givetian stage boundaries in the Barrandian basin (Czech Republic)

Autor:	Bohdan Křı́bek, Jindřich Hladil, Jana Hladíková
Rok vydání:	1997
Předmět:	chemistry.chemical_classification δ13C δ18O Paleontology chemistry.chemical_element Structural basin Oceanography Isotopes of oxygen chemistry Stage (stratigraphy) Organic matter Carbon Deposition (chemistry) Ecology Evolution Behavior and Systematics Geology Earth-Surface Processes
Zdroj:	Palaeogeography, Palaeoclimatology, Palaeoecology. 132:225-241
ISSN:	0031-0182
Popis:	Carbon and oxygen isotope composition and the chemistry of limestones, clayey limestones and shales were studied across stage boundaries from Pridoli to Givetian in the Barrandian basin. No substantial isotopic shifts were found at the Pragian–Emsian and Emsian–Eifelian boundaries. A gradual shift in δ13C values from −2.6 to +3.6‰ was observed in Pridoli and Lochkovian limestones. This shift is inferred to have been related to a combination of higher productivity, increased deposition of organic matter and shallowing of the basin. The global Kacak–otomari event just below the Eifelian–Givetian boundary is marked by an abrupt change in carbon isotopic values from about 1 to 3‰ in pelagic carbonates. No δ13C shift was found in shallow-water carbonates at the Eifelian–Givetian boundary. High δ18O values up to −1.3‰ in Pragian, Emsian and early Eifelian limestones indicate that the Barrandian basin was relatively isolated from the world ocean during those intervals. Lower δ18O values up to −7.5‰ in late Eifelian limestones may indicate the end of isolation.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::0f009d0f0db2b08607a087de9c9da3ba https://doi.org/10.1016/s0031-0182(97)00062-x Zobrazit plný text záznamu Full Text from ScienceDirect