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Aumento de la actividad hidrotermal durante las dos últimas terminaciones glaciales
D C Lund1, P D Asimow2, K A Farley2
1Deptartment of Marine Sciences, University of Connecticut, Groton, CT 06340, USA.
Science (New York, N.Y.)
|January 30, 2016
Resumen
El magmatismo de la cresta del océano medio, influenciado por el nivel del mar, puede generar retroalimentación en las capas de hielo. El aumento de la actividad hidrotermal durante las terminaciones glaciales sugiere que el derretimiento del manto promovió la deglaciación.
Área de la Ciencia:
- Ciencias de la Tierra
- Geología
- La oceanografía
Sus antecedentes:
- El magmatismo de la cresta del océano medio es el resultado de la expansión del fondo marino y el derretimiento por descompresión del manto.
- La producción de derretimiento puede ser modulada por cambios en el nivel del mar glacial-interglacial, que potencialmente vinculan el flujo magmático con el tamaño de la capa de hielo.
- Los estudios anteriores carecían de una sincronización precisa para conectar el magmatismo de la cresta con los cambios climáticos del Pleistoceno.
Objetivo del estudio:
- Investigar la relación entre el magmatismo de la cresta oceánica y el cambio climático pasado.
- Para restringir el tiempo de la variabilidad del derretimiento en los sistemas de cordilleras oceánicas.
- Explorar el papel potencial del flujo magmático como mecanismo de retroalimentación en los ciclos glaciales.
Principales métodos:
- Análisis de registros sedimentarios bien fechados de la elevación del Pacífico Este.
- Reconstrucción de los niveles de actividad hidrotermal del pasado.
- Correlación de las anomalías magmáticas con los períodos glaciales e interglaciales.
Principales resultados:
- Los registros sedimentarios revelan una mayor actividad hidrotermal durante las dos últimas terminaciones glaciales.
- La evidencia sugiere que el derretimiento anómalo del manto superior ocurrió durante los máximos glaciales cuando los niveles del mar eran más bajos.
- Las anomalías magmáticas en las cordilleras oceánicas coincidieron con períodos de deglaciación.
Conclusiones:
- Las fluctuaciones del nivel del mar durante los ciclos glaciales influyen en el derretimiento del manto superior y el magmatismo de la cresta oceánica media.
- El magmatismo mejorado durante la deglaciación puede haber contribuido al retroceso de las capas de hielo a través del calor y la liberación de carbono.
- El magmatismo de la cresta del océano medio actúa potencialmente como una retroalimentación negativa en el tamaño de la capa de hielo, influyendo en las transiciones climáticas globales.
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