Assessing orbital vs. volcanic control on carbon cycle during the Early Cretaceous

• Autores: Martinez, Mathiew; Aguirre Urreta, María Beatriz; Lescano, Marina; Dera, Guillaume; Omarini, Julieta; Tunik, Maisa; Frederichs, Tomas; Pälike, Heiko; O'Dogherty, Luis; Aguado, Roque; Company, Miguel; Sandoval, José
• Año de publicación: 2021
• Idioma: inglés
• Tipo de recurso: documento de conferencia
• Materia: Ciencias Exactas y Naturales; Orbital; Volcanic; Carbon; Ciencias Exactas y Naturales
• Institución: Universidad Nacional de Río Negro

Fil: Martinez, Mathiew. Univ. Rennes, Géosciences Rennes, Vandoeuvre-les-Nancy, France.
Fil: Aguirre Urreta, María Beatriz. Instituto de Estudios Andinos Don Pablo Groeber, CONICET & Universidad de Buenos Aires. Buenos Aires, Argentina
Fil: Lescano, Marina. Instituto de Estudios Andinos Don Pablo Groeber, CONICET & Universidad de Buenos Aires. Buenos Aires, Argentina
Fil: Dera, Guillaume. Géosciences Environnement Toulouse (GET), Université Paul Sabatier Toulouse. Toulouse, France
Fil: Omarini, Julieta. Universidad Nacional de Río Negro. Instituto de Investigación en Paleobiología y Geología. Río Negro, Argentina.
Fil: Tunik, Maisa. Universidad Nacional de Río Negro. Instituto de Investigación en Paleobiología y Geología. Río Negro, Argentina.
Fil: Frederichs, Tomas. Center for marine Environmental Sciences, Leobener Strasse 8, Universität Bremen. Germany.
Fil: Pälike, Heiko. Center for marine Environmental Sciences, Leobener Strasse 8, Universität Bremen. Germany.
Fil: O'Dogherty, Luis. Departamento Ciencias de la Tierra, Universidad de Cádiz, Spain.
Fil: Aguado, Roque. Departamento de Geología y CEACTEMA, Universidad de Jaén, Campus Científico-Tecnológico de Linares. Spain.
Fil: Company, Miguel. Departamento de Estratigrafía y Paleontología, Universidad de Granada, Spain.
Fil: Sandoval, José. Departamento de Estratigrafía y Paleontología, Universidad de Granada, Spain.
The interval from the Valanginian to the Barremian stages (137–121 Ma; Early Cretaceous) is punctuated by several episodes of environmental changes, accompanied by shifts in weathering intensity on the continents and changes in the Tethyan neritic carbonate production. We synthetize here the astrochronology of two recent studies performed in the Neuquén basin, Vocontian Basin and Subbetic Domain (Aguirre-Urreta et al., 2019; Martinez et al., 2020), anchored to CA-ID-TIMS U-Pb ages, which conclusions have been included in the Geologic Time Scale 2020 (Gale et al, in press). We applied this time scale to a compilation of carbon-isotope ratio from belemnites and proxies of detrital supply in the Tethyan area (Vocontian Basin and Subbetic Domain). From this compilation, we show that the episodes of environmental changes are paced by a 2.4-Myr cycle and, with a lower amplitude, a 1.2-Myr cycle. In addition, the new time scale shows the synchronicity between the Weissert Event and the Parana-Etendeka Large Igneous Province. In the series of carbon-isotope ratios measured on belemnite rostra, the amplitude of the 2.4-Myr cycle is twice higher during the Valanginian than in the Late Barremian and three times higher than in the Hauterivian and Early Barremian, suggesting that the activity of the Parana-Etendeka Large Igneous Province amplified the initial orbital forcing to trigger the environmental changes observed during the Mid-Valanginian.