Climatic ups and downs in a disturbed Jurassic world

Journal article
(Original article)


Publication Details

Author(s): Dera G, Brigaud B, Monna F, Laffont R, Puceat E, Deconinck JF, Pellenard P, Joachimski M, Durlet C
Journal: Geology
Publisher: Geological Society of America
Publication year: 2011
Volume: 39
Pages range: 215-218
ISSN: 0091-7613


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.



FAU Authors / FAU Editors

Joachimski, Michael Prof. Dr.
Lehrstuhl für Geologie (Exogene Dynamik)


External institutions
French Alternative Energies and Atomic Energy Commission (CEA)
Université Bourgogne Franche-Comté


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.

BibTeX: 

Last updated on 2018-09-08 at 15:38