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La liberación de metano de una cuenca volcánica como mecanismo para el calentamiento global inicial del Eoceno
Henrik Svensen1, Sverre Planke, Anders Malthe-Sørenssen
1Physics of Geological Processes, University of Oslo, PO Box 1048 Blindern, 0316 Oslo, Norway. hsvensen@geo.uio.no
Nature
|June 4, 2004
Resumen
La liberación masiva de metano por la actividad volcánica desencadenó un calentamiento global extremo en la época del Eoceno.
Área de la Ciencia:
- Paleoclimatología Paleoclimatología
- Geología Geología Geología.
- La geoquímica es la geoquímica.
Sus antecedentes:
- La época del Eoceno comenzó con un calentamiento global extremo, evidenciado por los desplazamientos de isótopos de carbono y oxígeno.
- Este calentamiento estaba relacionado con una afluencia rápida y masiva de carbono agotado en el sistema terrestre.
- Las teorías anteriores sugerían la fusión de hidratos de gas, pero carecían de un mecanismo de activación.
Objetivo del estudio:
- Para identificar el desencadenante de la liberación masiva de carbono durante el Eoceno temprano.
- Investigar el papel del vulcanismo en los eventos climáticos del Paleoceno/Eoceno.
Principales métodos:
- Análisis de perfiles de reflexión sísmica de las cuencas de Vøring y Møre.
- Identificación de miles de complejos de respiraderos hidrotermales.
Principales resultados:
- Evidencia de numerosos complejos de respiraderos hidrotermales en el mar de Noruega.
- Correlación de estas características con el límite Paleoceno/Eoceno.
Conclusiones:
- La intrusión de fundidos derivados del manto en sedimentos ricos en carbono probablemente causó la liberación de metano a través de complejos de ventilación.
- Este proceso volcánico proporciona un disparador para el calentamiento global del Eoceno temprano y los cambios asociados al ciclo del carbono.
- Mecanismos similares pueden explicar otros grandes eventos climáticos relacionados con las provincias ígneas.
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