globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2015.04.011
论文题名:
Geochemical consequences of intense pulse-like degassing during the onset of the Central Atlantic Magmatic Province
作者: Paris G.; Donnadieu Y.; Beaumont V.; Fluteau F.; Goddéris Y.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2016
卷: 441
起始页码: 74
结束页码: 82
语种: 英语
英文关键词: Carbon system ; Central atlantic magmatic province (CAMP) ; GEOCLIM ; Mass extinction ; Numerical modeling ; Triassic-jurassic boundary (TJB)
英文摘要: The Triassic-Jurassic boundary (TJB) is marked by one of the five largest mass extinctions of the Phanerozoic and the eruption of a large igneous province: the Central Atlantic Magmatic Province (CAMP). The TJB is characterized by a carbonate production crisis, by negative excursions in the carbon isotopic ratio of buried organic matter, and by successive peaks in atmospheric CO2. Here we use the numerical model GEOCLIM to explore the possible connections between the CAMP emplacement and the observed carbon cycle perturbations. Different degassing scenarios linked to the CAMP eruption are explored. We show that the emission of realistic amounts of CO2 that follow a geologically constrained degassing scenario as short-term peaks (less than 10 ka) leads to successive decrease in carbonate production, as observed in the geological record. We also calculate the evolution of carbon isotopes and show that our model reproduces the amplitude of the isotopic excursion with a volcanic degassing of CO2 characterized by a carbon isotopic composition of -20‰. Such low values could be associated to carbon pools of light isotopic composition located at the transition zone [Cartigny, P. 2010, Earth and Planetary Science Letters, v. 296, p. 329-339] and not necessarily to biogenic methane release. Finally, the model predicts a succession of short-term CO2 rises, with an amplitude in close agreement with available proxy-based reconstructions. © 2015 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68664
Appears in Collections:过去全球变化的重建

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作者单位: Laboratoires des Sciences du Climat de l'Environnement, CNRS-CEA, CEA Saclay, Orme des merisiers, Bât. 701, Gif-sur-Yvette cedex, France; Institut français du pétrole, 1 4 rue Bois-Préau, 92, Rueil-Malmaison, France; Institut de Physique du Globe, UMR 7154, Sorbonne Paris Cité, 1 rue Jussieu, Paris cedex 05, France; UFR des Sciences de la Terre, De l'Environnement et des Planètes, Université Paris 7, Sorbonne Paris Cité, 35 rue Hélène Brion, Paris cedex 13, France; Géosciences Environnement Toulouse, CNRS-Université de Toulouse III, 14 Avenue E. Belin, Toulouse, France; Geological and Planetary Science Division, MC 131-24, Pasadena, CA, United States

Recommended Citation:
Paris G.,Donnadieu Y.,Beaumont V.,et al. Geochemical consequences of intense pulse-like degassing during the onset of the Central Atlantic Magmatic Province[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2016-01-01,441
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