Título:	Assessing orbital vs. volcanic control on carbon cycle during the Early Cretaceous
Autor(es):	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
Fecha de publicación:	1-ago-2021
Revista:	EGU General Assembly
Resumen:	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.
URI:	http://rid.unrn.edu.ar/handle/20.500.12049/8249
Identificador DOI:	https://doi.org/10.5194/egusphere-egu21-11871
Aparece en las colecciones:	Objetos de conferencia

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