This section incorporates the main results obtained during the development of the research project in the form of references to publications in scientific journals or presentations to scientific meetings
PY20_00783 Research Project
New insights into the Barremian–lower Aptian calcareous nannofossils of the Mediterranean Tethys: chronostratigraphic and paleobiogeographic implicationsAguado, R., Company, M., O'Dogherty, L., Sandoval, J., Martinez, M., 2022. Marine Micropaleontology 173, 102114. Open Access. https://doi.org/10.1016/j.marmicro.2022.102114Abstract: A detailed study of calcareous nannofossil assemblages from twelve uppermost lower Barremian–lower Aptian sections in the Subbetic Domain of the Betic Cordillera was performed. Seven new nannofossil species (Crucibiscutum bastetanum, Crucibiscutum gracile, Chiastozygus lamprostauros, Cyclagelosphaera platyaspis, Lithraphidites aichmoides, Lithraphidites pugio, and Rhagodiscus sicutclipeus) are described, one species is emended (Lithraphidites magnus) and the taxonomic concept of the marker species Hayesites irregularis is discussed and clarified. The detailed stratigraphic range of new species, together with those of other relevant taxa, are determined and correlated to standard ammonite biostratigraphy. Age estimates of biostratigraphically relevant calcareous nannofossil biohorizons are calculated using astrochronologically tuned cyclostratigraphic data. Five new calcareous nannofossil subzones are proposed which enhance upper Barremian biostratigraphic resolution at a regional scale and are directly correlated with respect to the standard Tethyan ammonite zonation. Two of the new species described here are used as biostratigraphic markers for the newly proposed subzones. The duration of each subzone is also provided through astrochronological calibration. This study allows the refinement of the calcareous nannofossil zonation for the Mediterranean–Atlantic province of the Tethyan Realm. The implications of these new results are discussed regarding the extant definition and use of the Barremian/Aptian boundary. The morpho-evolutionary trends of selected nannofossil groups are reviewed in relation to the latest Barremian–Aptian paleogeographic changes, showing these were a prominent factor controlling calcareous nannoplankton evolution and biogeographical distribution in the west European-Atlantic region.
Publication on scientific journal
Episodes of accelerated environmental change during and after the early Aptian OAE 1a – insights from a pelagic succession from the western TethysCastro, J.M., Sequero, C., Quijano, M.L., de Gea, G.A, Aguado, R., Lowson, C., Naafs, B.D.A., Pancost, R.D. Under elaboration.Abstract: .
Publication on scientific journal
30/11/2021: Field sampling of sections Bco. de Cavila 2, Río Argos 6 y Arroyo de Gilico.04/12/2021: Field sampling in La Frotera section.20/01/2022: End of calcareous nannofossil quantitative study of smear-slides from the TE interval of the Bco. Cavila2 (high-resolution) and Cortijo del Hielo (mid-resolution) sections.03/02/2022: End of processing (crushing and grinding) of samples for geochemical analytics (δ13Ccarb, δ18Ocarb, δ13Corg, and ICP-mass) from Bco. Cavila 2, Río Argos 6 y Arroyo de Gilico sections.11/02/2022: Field sampling in Carbonero section.18/03/2022: End of calcareous nannofossil quantitative study of smear-slides from the MBE interval of the Arroyo de Gilico section (high-resolution).01/04/2022: ICP results and preliminary biomarker data were obtained for Río Argos 6 section.08/04/2022: End of calcareous nannofossil quantitative study of smear-slides from the TE interval of the La Frontera section.26/04/2022: ICP results and preliminary biomarker data were obtained for Bco. Cavila2 and Arroyo de Gilico sections.19/05/2022: Field sampling of Cjo. del Hielo section (high-resolution).17/06/2022: End of calcareous nannofossil quantitative study of smear-slides from the TE interval of the Río Argos 6 section (high-resolution).17/06/2022: δ13Ccarb and δ18Ocarb results were obtained for Bco. Cavila2 and Río Argos 6 sections.02/07/2022: δ13Corg results were obtained for Río Argos 6 section.08/07/2022: End of processing (crushing and grinding) of samples for geochemical analytics (δ13Ccarb, δ18Ocarb, ICP-mass and TOC) and CaCO3 content from Cortijo del Hielo section. 13/07/2022: Posters and presentations for 11th International Cretaceous Symposium, 12th International Symposium Geochemistry of the Earth’s Surface, and 21th International Sedimentological Congress were composed.
Orbital control of the anoxic events in the Hauterivian and Barremian stages. Martinez, M., Aguado, R., Company, M., Sandoval., J., O'Dogherty, L. 27e Réunion des Sciences de la Terre. Lyon 1-5 Nov 2021. Abstracts, p. 622.
Communications – scientific meetings
First record of a carbon cycle perturbation during the late Barremian: Multiproxy evidence for environmental change (Caravaca, Spain). Sequero, C., Aguado, R., Quijano., M.L., de Gea, G.A., Froehner, S., Company, M., O'Dogherty, L., Castro, J.M. 12th International Symposium Geochemistry of the Earth’s Surface, Zurich 24-29 Jul 2022.Complex environmental perturbations related to the early Aptian OAE 1a – insights from a pelagic succession from the western Tethys (Subbetic Zone, SE Spain). Sequero, C., Castro, J.M., Quijano., M.L., Aguado, R., de Gea, G.A., Naafs, B.D.A., Lowson, C., Pancost, R.D. 21th International Sedimentological Congress, Beijing 22-26 Aug 2022.Geochemical and calcareous nannofossil evidences of two late Barremian episodes of environmental change (SE Spain). Aguado, R., Company, M., Castro, J.M., de Gea, G.A., O'Dogherty, L., Sandoval, J., Quijano, M.L., Martinez, M., Froehner, S., Sequero, C. 11th International Cretaceous Symposium, Warsaw 22-26 Aug 2022.Synchronizing the timing of carbon cycle, volcanism and the pacing of the Earth’s orbit during the Early Cretaceous. Martinez, M., Aguirre-Urreta, M.B., Dera, G., Lescano, M., Omarini, J., Tunik, M., O'Dogherty, L., Aguado, R., Company, M., Bodin, S. 11th International Cretaceous Symposium, Warsaw 22-26 Aug 2022.Registro de dos episodios de cambio ambiental acelerado en el Barremiense superior: evidencias basadas en estratigrafía isotópica y nanofósiles calcáreos. [Record of two episodes of accelerated environmental change in the late Barremian: isotope stratigraphy and calcareous nannofossil evidences]. Aguado, R., Company, M., Sandoval, J., O'Dogherty, L., Martinez, M., Castro, J.M., de Gea, G.A. XXXVII Jornadas de la Sociedad Española de Paleontología, Cuenca 5-8 Oct 2022.Respuesta biótica y geoquímica al evento hipertermal del Aptiense inferior (OAE1a). Sondeo de Cau (Prebético de Alicante, España). [Geochemical and biotic response to the Early Aptian hyperthermal event (OAE 1a). The Cau Core (Prebetic of Alicante, Spain)]. de Gea, G.A., Castro, J.M., Aguado, R., Ruiz-Ortiz, P.A., Nieto, L.M., Quijano, M.L., Sequero, C., Froehner, S. XXXVII Jornadas de la Sociedad Española de Paleontología, Cuenca 5-8 Oct 2022.
Abstracts sent to upcoming scientific meetings
Synchronizing the timing of carbon cycle, volcanism and the pacing of the Earth’s orbit during the Early CretaceousMartinez, M., Aguirre-Urreta, B., Dera, G., Lescano, M., Omarini, J., Tunik, M., O›Dogherty, L., Aguado, R., Company, M., Bodin, S. Submitted to Earh-Science Reviews. Under revision.Abstract: .