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La suba saturación de vapor en el basalto primitivo de la cordillera oceánica media y el contenido volátil del manto
Alberto E Saal1, Erik H Hauri, Charles H Langmuir
1Lamont-Doherty Earth Observatory, Columbia University, Palisades, New York 10964, USA. asaal@ldeo.columbia.edu
Nature
|October 9, 2002
Resumen
Este estudio analizó el contenido volátil pre-eruptivo en basaltos de la cordillera oceánica media, revelando nuevos conocimientos sobre la Tierra.
Área de la Ciencia:
- La geoquímica es la geoquímica.
- Volcanología Volcanología.
- Ciencias de la Tierra Ciencias de la Tierra Ciencias de la Tierra
Sus antecedentes:
- El análisis volátil en sistemas magmáticos informa la composición del manto terrestre y los impactos de desgasificación magmática en la química oceánica y atmosférica.
- La mayoría de las lavas erupcionadas se desgasifican a presión atmosférica, perdiendo las firmas volátiles primarias debido a la baja solubilidad del magma.
Objetivo del estudio:
- Para determinar el contenido sub-saturado de sustancias volátiles pre-eruptivas de los basaltos de la cordillera oceánica media del centro de propagación intra-transformación de Siqueiros.
- Establecer nuevas restricciones sobre las abundancias y comportamientos volátiles dentro del manto superior.
Principales métodos:
- Análisis del contenido volátil en un conjunto de basaltos de la cordillera oceánica media.
- Investigar las correlaciones entre los volátiles y los oligoelementos refractarios en magmas insaturados.
Principales resultados:
- Se ha informado de un contenido sub-saturado de sustancias volátiles pre-eruptivas para los basaltos de Siqueiros de la cordillera oceánica media.
- Estableció nuevas restricciones sobre las abundancias de dióxido de carbono, agua, flúor, azufre y cloro en las fuentes normales de basalto de la cordillera oceánica media.
- Utilizó el comportamiento del dióxido de carbono y las relaciones CO2 / Nb y CO2 / Cl para estimar el dióxido de carbono y el cloro primitivos.
Conclusiones:
- La suba saturación en los magmas pre-eruptivos permite la preservación de las firmas volátiles primarias.
- Los datos proporcionan mejores estimaciones para el contenido y el comportamiento volátil del manto.
- Historias de desgasificación y contaminación restringidas de las crestas oceánicas medias a través del análisis volátil.
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