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El azufre y el cloro en los magmas de Deccan del Cretácico tardío y la liberación de gas eruptivo
Stephen Self1, Stephen Blake, Kirti Sharma
1Volcano Dynamics Group, Department of Earth and Environmental Sciences, Open University, Milton Keynes MK7 6AA, UK. stephen.self@open.ac.uk
Science (New York, N.Y.)
|March 22, 2008
Resumen
Las antiguas corrientes de lava masivas provienen de la India.
Área de la Ciencia:
- La geoquímica es la geoquímica.
- Volcanología Volcanología.
- Paleoclimatología Paleoclimatología
Sus antecedentes:
- Las trampas del Decán, en la India, se formaron a partir de grandes volúmenes de flujos de lava pāhoehoe hace 67-65 millones de años.
- Los impactos atmosféricos y de extinción de estas erupciones de basalto de inundación siguen siendo inciertos.
Objetivo del estudio:
- Para evaluar la posible liberación de gas por el volcanismo de Deccan Traps.
- Para cuantificar las emisiones de azufre (S) y cloro (Cl).
Principales métodos:
- Se midieron las concentraciones de S y Cl en inclusiones de vidrio y selvages dentro de las lavas de Deccan.
- Calculado potencial de liberación de SO2 y HCl por volumen de lava erupcionada.
Principales resultados:
- Las concentraciones de S de la lava de Deccan oscilaron entre cientos y ~ 1400 ppm; las concentraciones de Cl hasta ~ 900 ppm.
- Las erupciones podrían haber liberado hasta 5,4 Tg SO2/km3 y 1 Tg HCl/km3.
- Las estimaciones conservadoras sugieren 3,5 Tg SO2/km3 y 1 Tg HCl/km3.
Conclusiones:
- Las erupciones de Deccan Traps liberaron cantidades sustanciales de gases S y Cl.
- Es probable que los impactos ambientales graves resultaran de estos eventos masivos de inundación de basalto.
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