Article (Scientific journals)
Did a Katian Large Igneous Province trigger the Late Ordovician glaciation ? A hypothesis tested with a carbon cycle model
Lefebvre, Vincent; Servais, Thomas; François, Louis et al.
2010In Palaeogeography, Palaeoclimatology, Palaeoecology, 296, p. 310-319
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Keywords :
Ordovician; Hirnantian glaciation; Carbon cycle modelling
Abstract :
[en] The Ordovician is known as a period with high temperatures and high sea levels and a cooling event at the end of the period, leading to the Hirnantian glaciation and the !rst of the ‘big !ve’ mass extinctions of marine life. The cause of this cooling event remains unclear. Several authors correlate it with a drop in atmospheric pCO2 to a threshold permitting the ice accumulation on the Gondwana supercontinent. However, what are the reasons of the atmospheric pCO2 decrease? Here, we follow the hypothesis initiated by Barnes (2004) that an Ordovician superplume event occurred during the Middle to Late Ordovician. Such an event would not only have a large impact on the Ordovician biodiversi!cation (Barnes, 2004) but it would also be responsible for the climatic upheaval during the Late Ordovician by the emplacement of a low latitudinal continental basaltic province that had an impact on the atmospheric pCO2. There is no direct evidence of a superplume event or of basaltic traps and the present study is therefore a hypothetical modelling approach where we demonstrate with a numerical box model, including carbon, alkalinity and phosphorus cycles coupled with a 1D climate model (energy balance model-EBM) (François and Walker,1992), that such a scenario allows to explain both the mid-Ashgill (Katian) global warming event, known as the Boda Event (Fortey and Cocks, 2005), and the subsequent Late Ordovician (Hirnantian) glaciation. Because silicate weathering is enhanced upon warm and wet climate, we try to constrain the size and the latitudinal emplacement of the basaltic province leading to a suf!cient consumption of atmospheric pCO2 to the threshold proposed by Herrmann et al. (2004 a, b) to initiate a glaciation on Gondwana.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Lefebvre, Vincent
Servais, Thomas
François, Louis  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Modélisation du climat et des cycles biogéochimiques
Averbuch, Olivier
Language :
English
Title :
Did a Katian Large Igneous Province trigger the Late Ordovician glaciation ? A hypothesis tested with a carbon cycle model
Publication date :
2010
Journal title :
Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN :
0031-0182
eISSN :
1872-616X
Publisher :
Elsevier Science, Amsterdam, Netherlands
Volume :
296
Pages :
310-319
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 27 May 2010

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