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Implicaciones para los ciclos metálicos y volátiles del pH de los fluidos de la zona de subducción

Matthieu E Galvez¹, James A D Connolly¹, Craig E Manning²

¹Earth Sciences Department, Swiss Federal Institute of Technology, CH-8092 Zurich, Switzerland.

|November 18, 2016

Resumen

Los fluidos de la zona de subducción son ligeramente alcalinos, con un pH controlado por la composición de la roca y el contenido volátil. Esto influye en el ciclo global de metales y elementos volátiles en escalas de tiempo geológicas.

Área de la Ciencia:

Ciencias de la Tierra
Geoquímica
La geodinámica

Sus antecedentes:

La química de los fluidos acuosos gobierna los ciclos de los metales y los elementos volátiles de la Tierra.
Las zonas de subducción son entornos críticos para el intercambio químico mediado por fluidos.
La caracterización de la especiación y el pH de los fluidos de la zona de subducción es un desafío científico significativo.

Objetivo del estudio:

Para predecir el equilibrio fluido-roca en las zonas de subducción.
Para vincular la estructura térmica, la mineralogía y los modelos de especiación de fluidos.
Comprender los controles sobre el pH del fluido y sus implicaciones para el ciclo de los elementos.

Principales métodos:

Las predicciones termodinámicas de los equilibrios fluido-roca.
Modelado de la estructura térmica y la mineralogía de la zona de subducción.
Análisis de la especiación fluida bajo diferentes composiciones rocosas.

Principales resultados:

Los fluidos de la zona de subducción en las litologías de la corteza exhiben un pH ligeramente alcalino.
El pH del fluido está modulado por el contenido volátil y de cloro de la roca.
La subducción fría preserva el carbono oxidado; el pH del fluido de la cuña del manto es sensible a la composición de la roca.

Conclusiones:

Las variaciones de pH de los fluidos están relacionadas con la composición de las rocas, la diferenciación intramantílica y la infiltración de fluidos en la corteza.
Los cambios sutiles en la composición de la roca tienen un impacto significativo en el pH del fluido de la cuña del manto.
Existe una retroalimentación entre la química atmosférica y oceánica y la especiación de fluidos de la zona de subducción.

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