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- Title
Astronomical tuning of the Aptian stage and its implications for age recalibrations and paleoclimatic events.
- Authors
Leandro, C. G.; Savian, J. F.; Kochhann, M. V. L.; Franco, D. R.; Coccioni, R.; Frontalini, F.; Gardin, S.; Jovane, L.; Figueiredo, M.; Tedeschi, L. R.; Janikian, L.; Almeida, R. P.; Trindade, R. I. F.
- 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. The Early Cretaceous Aptian stage represents an interval of major dramatic climate changes, but there is no consensus on its lower boundary age. Here, the authors present an astro-chronological framework that offers new age constraints on the onset and duration of Aptian ocean anoxic events and the 'cold snap', among other significant climatic events.
- Subjects
CLIMATE change; AGE of onset; CYCLOSTRATIGRAPHY; PERMIAN-Triassic boundary
- Publication
Nature Communications, 2022, Vol 13, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-022-30075-3