loading page

Astronomical calibration of the Ocean Anoxic Event 1b and its implications for the cause of mid-Cretaceous events: a multiproxy record
  • +11
  • João Mauricio Figueiredo Ramos,
  • Jairo Francisco Savian,
  • Daniel Ribeiro Franco,
  • Milene Freitas Figueiredo,
  • Fabrizio Frontalini,
  • Rodolfo Coccioni,
  • Carolina Gonçalves Leandro,
  • Martino Giorgioni,
  • Paula H. C. P. Vidal,
  • Gabriella Fazio,
  • Luigi Jovane,
  • Nadia Sabatino,
  • Ricardo IF Trindade,
  • Leonardo Tedeschi
João Mauricio Figueiredo Ramos
Petrobras

Corresponding Author:[email protected]

Author Profile
Jairo Francisco Savian
Universidade Federal do Rio Grande do Sul
Author Profile
Daniel Ribeiro Franco
Coordenação de Geofísica, Observatório Nacional
Author Profile
Milene Freitas Figueiredo
Petrobras
Author Profile
Fabrizio Frontalini
DiSPeA, Urbino University
Author Profile
Rodolfo Coccioni
Università degli Studi di Urbino, IT
Author Profile
Carolina Gonçalves Leandro
Universidade Federal do Rio Grande do Sul
Author Profile
Martino Giorgioni
Universidade de Brasilia
Author Profile
Paula H. C. P. Vidal
Universidade de Brasília
Author Profile
Gabriella Fazio
National Observatory
Author Profile
Luigi Jovane
Universidade de Sao Paulo
Author Profile
Nadia Sabatino
Istituto per lo studio degli Impatti Antropici e Sostenibilità in ambiente marino (IAS-CNR), Palermo, Italy
Author Profile
Ricardo IF Trindade
Universidade de Sao Paulo
Author Profile
Leonardo Tedeschi
Centro de Pesquisas e Desenvolvimento Leopoldo Américo Miguez de Mello, Petrobras Petróleo Brasileiro S.A
Author Profile

Abstract

Cyclostratigraphic analyses were performed on magnetic susceptibility (MS), and elemental Ti and Fe series along the upper Aptian-lower Albian interval of the Poggio le Guaine (PLG) core, a Cretaceous pelagic succession in the Umbria-Marche Basin (central Italy). This interval represents one the most detailed and complete sedimentary archives and records oceanic perturbations associated with Oceanic Anoxic Event (OAE) 1b. The MS, Ti and Fe orbital control indicates a timespan of 2.68 Myr for OAE 1b event (114.10 to 111.34 Ma) and short eccentricity cycles played a key role, in controlling the amount of detrital input from weathering during monsoonal periods. Our chronostratigraphic study also provides age of 114.09 Ma for 113/Jacob, 113.25 Ma for Kilian, 112.67 Ma as a central age of the Monte Nerone cluster, 111.70 Ma for Urbino and 111.37 Ma for Leenhardt subevents, and a timespan of ~20 kyr for 113/Jacob, 70 kyr for Kilian, 670 kyr for Monte Nerone cluster, 60 kyr for Urbino and 60 kyr for Leenhardt levels. This study provides compelling evidence of the enormous potential C-isotope stratigraphy as tie points for cyclostratigraphic studies and as a valuable way to evaluate diachronism of bioevents. The organic-rich levels encompassing OAE 1b event has particular characteristics resulting from the combination of warm climate triggered by volcanic CO2 input, heavy precipitation, intense weathering and rapid marine transgressions, which leads the oceanic-atmospheric perturbations, acting as amplifiers of orbital forcings paleoclimate changes, resulting in deoxygenation and carbon burial during OAE 1b.
01 Feb 2024Submitted to ESS Open Archive
02 Feb 2024Published in ESS Open Archive