Abstract
Abstract 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 δ 13 C 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.
Published Version
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