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El depósito profundo del manto hidráulico proporciona evidencia de reciclaje de la corteza antes de hace 3.300

Alexander V Sobolev^1,2, Evgeny V Asafov³, Andrey A Gurenko⁴

¹Université Grenoble Alpes, Université Savoie Mont Blanc, Institute Science de la Terre (ISTerre), CNRS, IRD, IFSTTAR, Grenoble, France. alexander.sobolev@univ-grenoble-alpes.fr.

|July 17, 2019

Resumen

Agua en las profundidades de la Tierra

Área de la Ciencia:

Geoquímica y Geofísica
Dinámica del manto
La evolución temprana de la Tierra

Sus antecedentes:

El agua tiene un impacto significativo en las propiedades del manto, influyendo en la fusión y la convección.
El seguimiento del agua revela el reciclaje de materiales superficiales en el manto profundo, crucial para comprender la geodinámica global.
Las komatiitas, originadas por el derretimiento de alto grado del manto, son indicadores clave de la composición del manto profundo y el contenido de agua.

Objetivo del estudio:

Investigar la presencia y el origen del agua en el manto primitivo de la Tierra.
Para determinar si los depósitos profundos y hidratados del manto existían desde la era palearquea.
Para rastrear el reciclaje de la litosfera alterada por el agua de mar en el manto profundo.

Principales métodos:

Análisis de las relaciones deuterio-hidrógeno (D/H) en las inclusiones de fusión dentro de las comatiitas antiguas.
Análisis geoquímico de las inclusiones fundidas de komatiita, incluido el contenido de agua, cloro y plomo.
Comparación de las composiciones isotópicas con los depósitos de superficie, el manto típico y la corteza oceánica alterada.

Principales resultados:

Las comatiitas antiguas (3.300 millones de años) muestran firmas de isótopos de hidrógeno que indican agua en sus fuentes de manto.
Estos hallazgos confirman la existencia de un depósito de manto hídrico profundo desde al menos la era paleoarquea.
La composición isotópica sugiere que la litosfera alterada por el agua de mar, deshidratada durante la subducción, fue reciclada en el manto profundo.

Conclusiones:

Un depósito profundo de manto hidratado ha persistido en el interior de la Tierra desde hace al menos 3.600 millones de años.
La alteración del agua de mar y la subducción de la litosfera en el manto profundo ocurrieron hace 3.300 millones de años.
Este reciclaje temprano influyó en la composición del manto profundo y su contenido de agua.

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