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Sulfur and Chlorine in Late Cretaceous Deccan Magmas and Eruptive Gas Release

Self, Stephen ; Blake, Stephen ; Sharma, Kirti ; Widdowson, Mike ; Sephton, Sarah

Science (American Association for the Advancement of Science), 2008-03, Vol.319 (5870), p.1654-1657 [Periódico revisado por pares]

Washington, DC: American Association for the Advancement of Science

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Título:
Sulfur and Chlorine in Late Cretaceous Deccan Magmas and Eruptive Gas Release
Autor: Self, Stephen ; Blake, Stephen ; Sharma, Kirti ; Widdowson, Mike ; Sephton, Sarah
Assuntos: Aerosols ; Basalt ; Basaltic lavas ; Chlorine ; Crystalline rocks ; Crystallography ; Crystals ; Degasification ; Earth sciences ; Earth, ocean, space ; Exact sciences and technology ; Gases ; Geochemistry ; Glass ; Igneous and metamorphic rocks petrology, volcanic processes, magmas ; Inclusions ; Lava ; Scientific Concepts ; Selvage ; Soil and rock geochemistry ; Sulfur ; Volcanoes
É parte de: Science (American Association for the Advancement of Science), 2008-03, Vol.319 (5870), p.1654-1657
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Descrição: Large-volume pāhoehoe lava flows erupted 67 to 65 million years ago, forming the Deccan Traps, India. The impact of these flood basalt eruptions on the global atmosphere and the coeval end-Cretaceous mass extinction has been uncertain. To assess the potential gas release from this volcanism, we measured sulfur and chlorine concentrations in rare glass inclusions inside crystals and on glassy selvages preserved within lavas. Concentrations range from ~1400 parts per million of S and 900 parts per million of Cl in inclusions down to a few hundred parts per million in the lava. These data indicate that eruptions of Deccan lavas could have released at most 0.103 weight % of S, yielding up to 5.4 teragrams of SO₂ per cubic kilometer of lava. A more conservative estimate is 0.07 weight % of S and 0.04 weight % of Cl, yielding 3.5 teragrams of SO₂ and 1 teragram of HCl for every cubic kilometer of lava erupted. The flows were very large in volume, and these results imply that huge amounts of S and Cl gases were released. The environmental impact from even individual eruptions during past flood basalt activity was probably severe.
Editor: Washington, DC: American Association for the Advancement of Science
Idioma: Inglês

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Sulfur and Chlorine in Late Cretaceous Deccan Magmas and Eruptive Gas Release

Self, Stephen ; Blake, Stephen ; Sharma, Kirti ; Widdowson, Mike ; Sephton, Sarah

Washington, DC: American Association for the Advancement of Science

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