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Stability of atmospheric CO2 levels across the Triassic/Jurassic boundary.
Nature. 2001 Jun 07; 411(6838):675-7.Nat

Abstract

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.

Authors+Show Affiliations

Department of Geography and Geosciences, Bloomsburg University, Bloomsburg, Pennsylvania 17815, USA. lhtann@sunlink.netNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

11395765

Citation

Tanner, L H., et al. "Stability of Atmospheric CO2 Levels Across the Triassic/Jurassic Boundary." Nature, vol. 411, no. 6838, 2001, pp. 675-7.
Tanner LH, Hubert JF, Coffey BP, et al. Stability of atmospheric CO2 levels across the Triassic/Jurassic boundary. Nature. 2001;411(6838):675-7.
Tanner, L. H., Hubert, J. F., Coffey, B. P., & McInerney, D. P. (2001). Stability of atmospheric CO2 levels across the Triassic/Jurassic boundary. Nature, 411(6838), 675-7.
Tanner LH, et al. Stability of Atmospheric CO2 Levels Across the Triassic/Jurassic Boundary. Nature. 2001 Jun 7;411(6838):675-7. PubMed PMID: 11395765.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Stability of atmospheric CO2 levels across the Triassic/Jurassic boundary. AU - Tanner,L H, AU - Hubert,J F, AU - Coffey,B P, AU - McInerney,D P, PY - 2001/6/8/pubmed PY - 2001/6/8/medline PY - 2001/6/8/entrez SP - 675 EP - 7 JF - Nature JO - Nature VL - 411 IS - 6838 N2 - 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. SN - 0028-0836 UR - https://www.unboundmedicine.com/medline/citation/11395765/Stability_of_atmospheric_CO2_levels_across_the_Triassic/Jurassic_boundary_ L2 - https://doi.org/10.1038/35079548 DB - PRIME DP - Unbound Medicine ER -
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