RT journal article
T1 New Evidence for an Episode of Accelerated Environmental Change in the Late Barremian: Geochemical and Paleontological Records from the Subbetic Basin (Western Tethys)
A1 de Gea, Ginés A.
A1 Castro, José Manuel
A1 Company, Miguel
A1 O'Dogherty Luy, Luis Carlos
A1 Sandoval, José
A1 Quijano, María Luisa
A1 Sequero, Cristina
A1 Froehner, Sandro
A1 Aguado, Roque
A2 Ciencias de la Tierra
K1 paleoenvironments
K1 early cretaceous
K1 calcareous nannofossils
K1 C-isotopes
K1 elements
K1 biomarkers
K1 Taxy EEC
AB We investigate a new event of accelerated environmental change that was recorded during the late Barremian in the pelagic Subbetic Basin (Western Tethys). Two pelagic sections have been studied using a multi-proxy approach based on C-isotope stratigraphy and a high-resolution quantitative study of nannofossil assemblages, along with major and trace elements and biomarkers. Our results provide a detailed biostratigraphy and C-isotope stratigraphy, and outline the paleoenvironmentalconditions recorded during the early stages of the Taxy Episode. A disturbance has beenidentified in the C-isotope record, called the IFeNE (Intra-Feradianus negative C-excursion), which is coeval with environmental and biotic changes that predate the well-known ISNE (Intra-Sarasini negative C-excursion). The combined analysis of nannofossil associations, C-isotopes, major and trace elements, and biomarker distributions indicates a separate episode of warming heralding the ISNE, resulting in the acceleration of the hydrological cycle and a consequent increase in continentalinputs and the fertilization of surface waters. The origin of the Taxy Episode (the IFeNE and ISNE) has been related to orbital factors (high-eccentricity cycles), and to a global increase in volcanism, probably related to the early phases of the Ontong Java Plateau.
PB MDPI
SN 2076-3263
YR 2024
FD 2024
LK http://hdl.handle.net/10498/35278
UL http://hdl.handle.net/10498/35278
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 11-nov-2026