PY20_00783 Project

I+D+i Project, funded by Plan Andaluz de Investigación, Desarrollo e Innovación (PAIDI 2020). Consejería de Transformación Económica, Industria, Conocimiento y Universidades. Junta de Andalucía.

Main researcher contact

+34 953648522 raguado@ujaen.es

Objectives

The results of previous research carried out by the members of the team throughout the Lower Cretaceous led to the proposal of new objectives and scientific challenges in relation to the multidisciplinary study of the interval between the upper part of the Lower Barremian and the Lower Aptian. The main objectives of this project have not been addressed so far by any other international research team 
PY20_00783 Research Project

Events around the Barremian / Aptian boundary

The problematic around the Barremian/Aptian boundary

Currently, the boundary between the Barremian and Aptian Stages (standard chronostratigraphic units) is provisionally located at the base of the CM0r magnetochron, as agreed at the Second International Symposium on Cretacous Stage Boundaries (Brussels, 1995). This designation was made on the basis of the supposed proximity of the lower boundary of CM0r to the first appearance of deshayesitid ammonites (Prodeshayesites), which is considered as the base of the Aptian by ammonite specialists (e.g., Reboulet et al., 2018) . Subsequent investigations have shown that the CM0r base is located within the upper Barremian, being quite below the first appearance of deshayesitids. In addition, the magnetostraigraphic record is very poor in the hemipelagic sections where ammonite stratigraphy has been established, preventing their direct correlation. At this time, it is being discussed by the Aptian Working Group (AWG) of the International Subcommission on Cretaceous Stratigraphy which may be the best event to be used as Barremian / Aptian boundary at a global scale. Several researchers of our team are members of the AWG, hence one of the objectives of the current project is the accurate determination of the events (biological and geochemical) along the upper part of the Barremian and the lower part of the Aptian. This knowlledge will provide the scientific community with the information needed for choosing the most appropriate event to be used as the Barremian / Aptian boundary.
To determine the location of MBE and TE Accurately determine the position of these two episodes of accelerated environmental change (Middle Barremian Episode and Taxy Episode) within the standard chronostratigraphic scale, through integrated biostratigraphic analysis, determination of C and O isotope curves and cyclostratigraphic-astrochronological calibration  To determine the sequence of events (biological and geochemical) around the Barremian / Aptian boundary, in order to provide the scientific community with precise and relevant information for the choice of the most adequate marker for its global definition  To investigate the possible relationships between EECs within the study interval and assess the role that the MBE and TE could have played as precursors of the Early Aptian Oceanic Anoxic Event 1a (OAE 1a)  To determine paleoenvironmental and paleoclimatic conditions associated with each episode of environmental change (EEC), their effects on marine pelagic biota and on primary producers of organic matter (algae, bacteria, marine and terrestrial plants) 
Bco. de Cavila after Martinez et al. (2020). Gorgo a Cerbara after Frau et al. (2018) Bco. de Cavila after Martinez et al. (2020). Gorgo a Cerbara after Frau et al. (2018) Bco. de Cavila after Martinez et al. (2020). Gorgo a Cerbara after Frau et al. (2018)
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