Astronomical tuning of the Aptian stage and its implications for age recalibrations and paleoclimatic events

C. G. Leandro (), J. F. Savian, M. V. L. Kochhann, D. R. Franco, R. Coccioni, F. Frontalini, S. Gardin, L. Jovane, M. Figueiredo, L. R. Tedeschi, L. Janikian, R. P. Almeida and R. I. F. Trindade
Additional contact information
C. G. Leandro: Universidade Federal do Rio Grande do Sul
J. F. Savian: Universidade Federal do Rio Grande do Sul
M. V. L. Kochhann: Universidade de São Paulo
D. R. Franco: R. General José Cristino, 77
R. Coccioni: Università degli Studi di Urbino “Carlo Bo”
F. Frontalini: Località Crocicchia
S. Gardin: Sorbonne Université–MNHN–CNRS, 4, Place Jussieu
L. Jovane: Universidade de São Paulo
M. Figueiredo: Petrobras Petróleo Brasileiro S.A
L. R. Tedeschi: Petrobras Petróleo Brasileiro S.A
L. Janikian: Universidade Federal de São Paulo, Rua Carvalho de Mendonça, 144
R. P. Almeida: Universidade de São Paulo, Rua do Lago 562
R. I. F. Trindade: Universidade de São Paulo

Nature Communications, 2022, vol. 13, issue 1, 1-12

Abstract: Abstract The Aptian was characterized by dramatic tectonic, oceanographic, climatic and biotic changes and its record is punctuated by Oceanic Anoxic Events (OAEs). The timing and duration of these events are still contentious, particularly the age of the Barremian-Aptian boundary. This study presents a cyclostratigraphic evaluation of a high-resolution multiproxy dataset (δ13C, δ18O, MS and ARM) from the Poggio le Guaine core. The identification of Milankovitch-band imprints allowed us to construct a 405-kyr astronomically-tuned age model that provides new constraints for the Aptian climato-chronostratigraphic framework. Based on the astronomical tuning, we propose: (i) a timespan of ~7.2 Myr for the Aptian; (ii) a timespan of ~420 kyr for the magnetic polarity Chron M0r and an age of ~120.2 Ma for the Barremian−Aptian boundary; and (iii) new age constraints on the onset and duration of Aptian OAEs and the ‘cold snap’. The new framework significantly impacts the Early Cretaceous geological timescale.

Date: 2022
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DOI: 10.1038/s41467-022-30075-3

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