The Oligocene–Miocene transition climate recorded in a lacustrine sequence, Ebro Basin: preliminary insights

Authors

  • Concha Arenas Department of Earth Sciences, University of Zaragoza - Institute for Research on Environmental Sciences of Aragón (IUCA) and GeoTransfer Group
  • Lluís Cabrera Department of Earth and Ocean Dynamics, Geomodels Research Institute and Research Group of Geodynamics and Basin Analysis, Universitat de Barcelona
  • Mª Cinta Osácar Department of Earth Sciences, University of Zaragoza - Institute for Research on Environmental Sciences of Aragón (IUCA) and GeoTransfer Group
  • Luis Valero Department of Earth and Ocean Dynamics, Geomodels Research Institute and Research Group of Geodynamics and Basin Analysis, Universitat de Barcelona
  • Javier Pérez-Rivarés Department of Earth Sciences, University of Zaragoza
  • Joaquín Bastida Unit of Geology, University of Valencia
  • Miguel Garcés Department of Earth and Ocean Dynamics, Geomodels Research Institute and Research Group of Geodynamics and Basin Analysis, Universitat de Barcelona
  • Luis Auqué Department of Earth Sciences, University of Zaragoza
  • Andres Gil Department of Earth Sciences, University of Zaragoza - Institute for Research on Environmental Sciences of Aragón (IUCA) and GeoTransfer Group
  • María J. Gimeno Department of Earth Sciences, University of Zaragoza

DOI:

https://doi.org/10.55407/geogaceta100684

Keywords:

Oligocene–Miocene transition, lacustrine and palustrine carbonates, paleoclimate, δ13C and δ18O, NE Iberia

Abstract

The climate evolution across the Oligocene–Miocene transition has been studied through a 23.5 to 22 Ma succession in the eastern Ebro Basin, dated by magnetostratigraphy. The study is based on the δ13C and δ18O composition coupled with sedimentological analysis of a dominantly lacustrine and palustrine carbonate succession, focusing on the limestone facies. The deposits formed in alluvial plain, saline mud flat, and carbonate lacustrine and palustrine depositional environments. Changes in lake water level and hydrodynamics, and biological processes triggered the formation of distinct carbonate facies, causing isotopic differences among them. The isotopic variations likely reflect changes in the precipitation/evaporation ratio and temperature in the Ebro Basin that might be the regional record of the Mi-1 Glaciation. A change in variability in δ13C and δ18O and an inflection in δ13C mark the Oligocene–Miocene boundary (23.03 Ma). The decrease in δ13C and δ18O variability may correspond to steadier depositional, climatic and hydrological conditions through time.

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Topografía del detal del cráter Gusev (Marte)

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Published

2024-06-29

How to Cite

Arenas, C., Cabrera, L., Osácar, M. C., Valero, . L., Pérez-Rivarés, J. ., Bastida, J. ., Garcés, M. ., Auqué, L. ., Gil, A. ., & Gimeno, M. J. (2024). The Oligocene–Miocene transition climate recorded in a lacustrine sequence, Ebro Basin: preliminary insights. GEOGACETA, 75, 11–14. https://doi.org/10.55407/geogaceta100684

Issue

Vol. 75 (2024): January-June

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Artículos

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Copyright (c) 2024 Concha Arenas Abad, Lluís Cabrera Pérez, Mª Cinta Osácar Soriano, Luis Valero Valero, Javier Pérez Rivarés, Joaquín Bastida Cuairán, Miguel Garcés Crespo, Luis Auqué Sanz, Andres Gil Imaz, María José Gimeno Serrano

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