Anoxic events in the Early Cretaceous succession of Pădurea Craiului. Correlation and comparison with other Carpathian areas
Published:January 01, 2013
D. C. Papp, I. Cociuba, 2013. "Anoxic events in the Early Cretaceous succession of Pădurea Craiului. Correlation and comparison with other Carpathian areas", Isotopic Studies in Cretaceous Research, A.-V. Bojar, M. C. Melinte-Dobrinescu, J. Smit
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Major fluctuations in carbon-isotope composition (−2.8 to +5.4‰), as well as in oxygen-isotope composition (−10.2 to −2.1‰), are documented for Hauterivian–Albian shallow-water platform carbonate deposits in Pădurea Craiului (Apuseni Mountains, Romania). A composite carbon- and oxygen-isotope curve reveals the OAE1a and OAE1b as the main oceanic anoxic events (OAEs). Black shales or organic-rich levels, generally associated with such events, are poorly developed in Pădurea Craiului, testifying to slightly different responses to the carbon cycle perturbation between shallow- and deep-water environments. Palaeotemperatures of about 16–35 °C can be envisaged for the Late Hauterivian and Barremian in Pădurea Craiului, similar to those inferred from belemnite stable-isotope data from the Bersek Quarry (Gerecse Mountains, Hungary). For the Early Aptian interval, the δ13C variation pattern in Pădurea Craiului is similar to that documented in the Rochovica section from the Slovak Western Carpathians, developed in a deeper-water environment, although the interval of variation in Pădurea Craiului corresponds better to other shallow-water environment sections in the western Tethys.
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Isotopic Studies in Cretaceous Research
The Cretaceous was a period characterized by very warm climate, oceanic anoxic and oxic events and enhanced volcanic activity. The end of the Cretaceous is punctuated by a well-documented asteroid impact and the extinction of, among other groups, the dinosaurs. This volume elucidates various aspects of Cretaceous marine and continental environmental conditions. The articles in this book present a broad range of interdisciplinary contributions, which are grouped into sections on marine environments(including anoxic and oxic events, volcanism and the Cretaceous–Palaeocene boundary); mixed marine–freshwater environments and continental records. The isotopic data are combined with further geochemical, palaeontological, lithological and mineralogical proxies. The interdisciplinary approach offered here gives a solid investigation base for this fascinating period. There are examples from Europe, Asia, South and North America, and from the Early Cretaceous to the Cretaceous–Paleogene boundary.