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La remobilización del carbono de la corteza puede dominar las emisiones de arco volcánico

Emily Mason¹, Marie Edmonds², Alexandra V Turchyn¹

¹Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, UK.

Science (New York, N.Y.)

|July 22, 2017

Resumen

Los datos de isótopos de carbono volcánico revelan que la Tierra

Área de la Ciencia:

Geoquímica
Geoquímica de los isótopos
Volcanología

Sus antecedentes:

El flujo de carbono influye en el clima y la habitabilidad de la Tierra.
Los gases volcánicos son un componente clave del ciclo global del carbono.

Objetivo del estudio:

Para analizar los isótopos de carbono y helio de los arcos volcánicos a nivel mundial.
Para determinar la composición isotópica del carbono de los gases volcánicos.
Para investigar las fuentes de carbono volcánico.

Principales métodos:

Compilación de un conjunto de datos globales para los isótopos de carbono y helio.
Análisis de las composiciones isotópicas de muestras de arco volcánico.
Comparación de los valores de isótopos de gas volcánico con el basalto de la cresta oceánica media.

Principales resultados:

El gas volcánico global promedio tiene una composición isotópica de carbono más pesada (-3,8 a -4,6 ‰) que el basalto de la cresta oceánica (-6,0 ‰).
Los arcos continentales maduros con plataformas de carbonato acreed son los principales emisores de carbono volcánico con mayor δ 13 C.
El reprocesamiento de la piedra caliza de la corteza es una fuente importante de carbono volcánico.

Conclusiones:

Las fuentes de carbono volcánico son más diversas de lo que se suponía anteriormente.
El entierro fraccionado de carbono orgánico puede ser menor y ha variado a lo largo del tiempo geológico.
Los ciclos supercontinentales influyen en las contribuciones de carbono volcánico a la atmósfera.

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