6533b837fe1ef96bd12a1f7d

RESEARCH PRODUCT

Astrochronology of the Valanginian stage from GSSP candidates and hypostratotype.

subject

description

Valanginian; Astrochronology; Gamma-ray spectrometry; Weissert event; Paraná-Etendeka; International audience; The Valanginian Stage currently displays no radiometric age, which severely hampers palaeoceanographic reconstructions for this time interval. An astrochronology of the Valanginian Stage using the stable 405-kyr eccentricity cycle was performed on biostratigraphically well-calibrated standard sections from the Vocontian Basin (southeastern France). High-resolution gamma-ray spectrometry signals were obtained from orbitally driven marl-limestone alternations from five sections in the basin, and they display the same long-term trends. The spectral analyses present the pervasive record of the 405-kyr eccentricity cycle together with precession, obliquity, and 2.4-Myr eccentricity. Based on the identification of the 405-kyr eccentricity cycle, the duration of the Valanginian Stage is assessed at 5.08 Myr. Since the Weissert Event appears to be ~3 Myr older than the onset of the Paraná-Etendeka Large Igneous Province activity, a link between these events is unlikely. We therefore propose, following Gröcke et al. (2005) and Westermann et al. (2010), that continental organic carbon storage and carbonate platform demise are responsible for the onset of the δ13C positive excursion. In addition, a stronger obliquity control appears in the O. (O.) nicklesi and C. furcillata subzones. This may be linked to the limited production of polar ice suggested for this time interval.