Climatic ups and downs in a disturbed Jurassic world

Dera G, Brigaud B, Monna F, Laffont R, Puceat E, Deconinck JF, Pellenard P, Joachimski M, Durlet C (2011)

Publication Type: Journal article, Original article

Publication year: 2011

Journal

Geology Geological Society of America

Publisher: Geological Society of America

Book Volume: 39

Pages Range: 215-218

DOI: 10.1130/G31579.1

Abstract

The tropical, warm, and equable climate of the Jurassic world is regularly challenged by geoscientists, especially since oxygen isotopes (δ18O) of fossil hardparts have been used to reconstruct the paleotemperature history of seawater. By applying the innovative "SiZer" (significant zero crossings of the derivatives) statistical approach to a newly compiled δ18O database for the Jurassic, we demonstrate the occurrence of major and multiscale δ18O changes mainly related to climate disturbances. For the first time, two long-term anomalies in δ18O are identified during the Toarcian and the Late Jurassic, in conjunction with intensive volcanism in large igneous provinces. These results support a strong influence of repeated volcanic pulses on the modulation of pCO2, temperatures, and polar ice cap volumes over protracted periods. At shorter time scales, 13 relatively rapid (0.5-1 m.y.) and significant warming and cooling events are identified, the causes of which include transient fluctuations in greenhouse gas concentrations related to still-debated mechanisms. © 2011 Geological Society of America.

Authors with CRIS profile

Michael Joachimski Lehrstuhl für Geologie (Exogene Dynamik)

Involved external institutions

Université Bourgogne Franche-Comté FR France (FR) French Alternative Energies and Atomic Energy Commission (CEA) FR France (FR)

How to cite

APA:

Dera, G., Brigaud, B., Monna, F., Laffont, R., Puceat, E., Deconinck, J.-F.,... Durlet, C. (2011). Climatic ups and downs in a disturbed Jurassic world. Geology, 39, 215-218. https://dx.doi.org/10.1130/G31579.1

MLA:

Dera, Guillaume, et al. "Climatic ups and downs in a disturbed Jurassic world." Geology 39 (2011): 215-218.

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