Carbon and oxygen isotope ratios from Barranco de Cavila sections (Barremian, Early Cretaceous; Subbetic Domain, Southeast Spain)

Résumé

The data of two sections studied in the Barremian (Early Cretaceous) of the Subbetic Domain (SE Spain) are shown here together with a detailed log showing the bed number and the biostratigraphic scheme. The samples were collected with a geologist hammer in May 2016. The average sample distance is 0.07 m and was kept as constant as possible using a Jacob's staff to ensure the detection of all the Milankovitch cycles applying Fast Fourier Transforms and related methods (e.g. multi-taper). The lithology is composed of marl-limestone alternations deposited in a (hemi-)pelagic setting. Observed fauna is composed of ammonites, radiolarians, foraminifera, calcareous nannofossils and scarce belemnites, bivalves, gastropods, brachiopods and irregular echinoids. The biostratigraphy scheme is provided in the detailed logs and is based on Tethyan ammonite and calcareous nannofossils. The interval studied of Barranco de Cavila section (38°3'10'' N; 1°53'20'' W) covers from the Late Barremian (Vandenheckii Zone) to the Early Aptian (Forbesi Zone). Carbon and oxygen isotope ratios were measured with a Wahlen VG Prism II mass spectrometer. The mass spectrometer was calibrated with three NBS standards, Nos. 18, 19 and 20