Document Detail

Stability of atmospheric CO2 levels across the Triassic/Jurassic boundary.
MedLine Citation:
PMID:  11395765     Owner:  NLM     Status:  PubMed-not-MEDLINE    
The Triassic/Jurassic boundary, 208 million years ago, is associated with widespread extinctions in both the marine and terrestrial biota. The cause of these extinctions has been widely attributed to the eruption of flood basalts of the Central Atlantic Magmatic Province. This volcanic event is thought to have released significant amounts of CO2 into the atmosphere, which could have led to catastrophic greenhouse warming, but the evidence for CO2-induced extinction remains equivocal. Here we present the carbon isotope compositions of pedogenic calcite from palaeosol formations, spanning a 20-Myr period across the Triassic/Jurassic boundary. Using a standard diffusion model, we interpret these isotopic data to represent a rise in atmospheric CO2 concentrations of about 250 p.p.m. across the boundary, as compared with previous estimates of a 2,000-4,000 p.p.m. increase. The relative stability of atmospheric CO2 across this boundary suggests that environmental degradation and extinctions during the Early Jurassic were not caused by volcanic outgassing of CO2. Other volcanic effects-such as the release of atmospheric aerosols or tectonically driven sea-level change-may have been responsible for this event.
L H Tanner; J F Hubert; B P Coffey; D P McInerney
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Nature     Volume:  411     ISSN:  0028-0836     ISO Abbreviation:  Nature     Publication Date:  2001 Jun 
Date Detail:
Created Date:  2001-06-07     Completed Date:  2001-07-19     Revised Date:  2003-10-30    
Medline Journal Info:
Nlm Unique ID:  0410462     Medline TA:  Nature     Country:  England    
Other Details:
Languages:  eng     Pagination:  675-7     Citation Subset:  -    
Department of Geography and Geosciences, Bloomsburg University, Bloomsburg, Pennsylvania 17815, USA.
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Comment In:
Nature. 2002 Jan 24;415(6870):386-7; author reply 388   [PMID:  11807542 ]
Nature. 2002 Jan 24;415(6870):387-8   [PMID:  11807543 ]

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