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La subducción del agua de mar controla la composición de gases nobles pesados del manto
Greg Holland1, Chris J Ballentine
1School of Earth, Atmosphere and Environmental Sciences, The University of Manchester, Oxford Road, Manchester M13 9PL, UK. g.holland@manchester.ac.uk
Nature
|May 12, 2006
Resumen
Los gases nobles del manto de la Tierra revelan los secretos de la adquisición volátil planetaria. Subducción de agua de mar y sedimentos, no es un proceso.
Área de la Ciencia:
- * Geoquímica y Ciencias Planetarias.
Sus antecedentes:
- * La composición volátil del manto terrestre ofrece pistas sobre la formación y evolución de los planetas.
- * Los gases nobles (He, Ne, Ar, Kr, Xe) en el manto tienen composiciones isotópicas vinculadas a fuentes solares, atmosféricas y radiogénicas.
- * Estudios anteriores corrigieron los gases nobles del manto para la contaminación atmosférica y de la corteza.
Objetivo del estudio:
- * Para investigar el origen de los gases nobles pesados (Ar, Kr, Xe) en el manto de la Tierra.
- * Para probar la hipótesis de una "barrera de subducción" de un gas noble.
- * Para explicar la composición elemental e isotópica de los gases nobles del manto y el agua.
Principales métodos:
- * Análisis de las composiciones elementales e isotópicas de gases nobles en el gas magmático de CO2 derivado del manto.
- * Corrección por contribuciones de gases nobles atmosféricos, de aguas subterráneas y de la corteza terrestre.
- * Modelización del reciclaje de gases nobles y agua a través de la subducción.
Principales resultados:
- * Los gases no radiogénicos pesados nobles en el manto muestran una similitud elemental con el agua de mar.
- * La subducción de sedimentos influenciados por el agua de mar explica la mayoría de Ar, Kr y Xe no radiogénicos en el manto.
- * La subducción representa aproximadamente el 50% del contenido de agua del manto.
- * El reciclaje mejorado del material subducido explica las variaciones en los basaltos derivados de las plumas.
Conclusiones:
- * Se cuestiona el concepto de una "barrera de subducción" de un gas noble.
- * La subducción de sedimentos y agua de mar es el mecanismo principal que controla la composición de gases nobles del manto.
- * Este proceso contribuye significativamente al contenido de agua del manto e influye en la composición de las plumas del manto.
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