Cool episode and platform demise in the Early Aptian: New insights on the links between climate and carbonate production

Bonin A, Puceat E, Vennin E, Mattioli E, Aurell M, Joachimski M, Barbarin N, Laffont R (2016)

Publication Language: English

Publication Status: Published

Publication Type: Journal article, Original article

Publication year: 2016

Journal

Paleoceanography American Geophysical Union (AGU) / Wiley

Book Volume: 31

Pages Range: 66-80

Journal Issue: 1

DOI: 10.1002/2015PA002835

Abstract

The Early Aptian encountered several crises in neritic and pelagic carbonate production, major perturbations in the carbon cycle, and an oceanic anoxic event (OAE1a). Yet the causal links between these perturbations and climate changes remain poorly understood, partly because temperature records spanning the Early Aptian interval are still scant. We present new δO data from well-preserved bivalves from a carbonate platform of the Galve subbasin (Spain) that document a major cooling event postdating most of OAE1a. Our data show that cooling postdates the global platform demise and cannot have triggered this event that occurred during the warmest interval. The warmest temperatures coincide with the time equivalent of OAE1a and with platform biotic assemblages dominated by microbialites at Aliaga as well as on other Tethyan platforms. Coral-dominated assemblages then replace microbialites during the subsequent cooling. Nannoconids are absent during most of the time equivalent of the OAE1a, probably related to the well-known crisis affecting this group. Yet they present a transient recovery in the upper part of this interval with an increase in both size and abundance during the cool interval portion that postdates OAE1a. An evolution toward cooler and drier climatic conditions may have induced the regional change from microbial to coral assemblages as well as nannoconids size and abundance increase by limiting continent-derived input of nutrients.

Authors with CRIS profile

Michael Joachimski Lehrstuhl für Geologie (Exogene Dynamik)

Involved external institutions

Université Bourgogne Franche-Comté FR France (FR) Centre Européen de Recherche et d’Enseignement des Géosciences de l’Environnement (CEREGE) FR France (FR) Universidad de Zaragoza ES Spain (ES) Université Claude Bernard Lyon 1 (UCB) FR France (FR) Badley Ashton & Associates Ltd GB United Kingdom (GB)

How to cite

APA:

Bonin, A., Puceat, E., Vennin, E., Mattioli, E., Aurell, M., Joachimski, M.,... Laffont, R. (2016). Cool episode and platform demise in the Early Aptian: New insights on the links between climate and carbonate production. Paleoceanography, 31(1), 66-80. https://doi.org/10.1002/2015PA002835

MLA:

Bonin, Aurelie, et al. "Cool episode and platform demise in the Early Aptian: New insights on the links between climate and carbonate production." Paleoceanography 31.1 (2016): 66-80.

BibTeX: Download