144854 20260219090927.0 doi 10.55407/geogaceta100684 sideral 139647 ART-2024-139647 spa Arenas, Concha Universidad de Zaragoza (orcid)0000-0002-4212-0524 The Oligocene–Miocene transition climate recorded in a lacustrine sequence, Ebro Basin: preliminary insights 2024 Access copy available to the general public Unrestricted 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. info:eu-repo/grantAgreement/ES/MICINN-AEI/PID2019-106440GB-C21 nfo:eu-repo/grantAgreement/ES/MICINN-AEI/PID2019-106440GB-C22 info:eu-repo/semantics/openAccess by-nc-sa https://creativecommons.org/licenses/by-nc-sa/4.0/deed.es 0.2 2024 0.168 2024 Geology 2024 Q4 0.4 2024 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Cabrera, Lluís Osácar, Mª Cinta Universidad de Zaragoza (orcid)0000-0002-5246-366X Valero, Luis Pérez-Rivarés, Javier (orcid)0000-0002-1802-2115 Bastida, Joaquín Garcés, Miguel Auqué, Luis Universidad de Zaragoza (orcid)0000-0003-1463-1682 Gil, Andres Gimeno, María J. 2000 685 Universidad de Zaragoza Dpto. Ciencias de la Tierra Área Petrología y Geoquímica 2000 280 Universidad de Zaragoza Dpto. Ciencias de la Tierra Área Estratigrafía 2000 120 Universidad de Zaragoza Dpto. Ciencias de la Tierra Área Cristalografía Mineralog. 75 (2024), 11-14 Geogaceta Geogaceta 0213-683X 1488087 http://zaguan.unizar.es/record/144854/files/texto_completo.pdf Versión publicada 3170862 http://zaguan.unizar.es/record/144854/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:144854 articulos driver 2026-02-19-09:00:01 ARTICLE