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Zona de transición del manto hidroso indicada por la ringwoodita incluida dentro del diamante
D G Pearson1, F E Brenker2, F Nestola3
1Department of Earth and Atmospheric Sciences, 1-26 Earth Sciences Building, University of Alberta, Edmonton, Alberta T6G 2E3, Canada.
Nature
|March 14, 2014
Resumen
La zona de transición del manto profundo de la Tierra puede contener agua significativa. Los investigadores encontraron evidencia de ringwoodita rica en agua en un diamante brasileño, lo que confirma que la zona es localmente hidráulica.
Área de la Ciencia:
- La geoquímica es la geoquímica.
- La mineralogía es la Mineralogía.
- Sismología Sismología Sismología.
Sus antecedentes:
- Se teoriza que la zona de transición de la Tierra (410-660 km de profundidad) es un gran depósito de agua.
- Los polimorfos de olivino de alta presión (wadsleyita, ringwoodita) pueden almacenar una cantidad significativa de agua.
- Los datos geofísicos sobre la hidratación de la zona de transición siguen siendo controvertidos.
Objetivo del estudio:
- Proporcionar evidencia directa de la presencia terrestre de polimorfas de olivino de alta presión. para proporcionar evidencia directa de la presencia terrestre de polimorfas de olivino de alta presión. para proporcionar evidencia directa de la presencia terrestre de polimorfas de olivino de alta presión. para proporcionar evidencia directa de la presencia terrestre de polimorfas de olivino de alta presión. para proporcionar evidencia directa de la presencia terrestre de polimorfas de olivino de alta presión. para proporcionar evidencia directa de la presencia terrestre de polimorfas de olivino de alta presión.
- Para investigar el contenido de agua de la zona de transición de la Tierra.
Principales métodos:
- Difracción de rayos X por difracción de rayos X.
- La espectroscopia de Raman es una espectroscopia de Raman.
- La espectroscopia infrarroja es una espectroscopia de infrarrojos.
- Análisis de una inclusión de diamante de Juína, Brasil.
Principales resultados:
- La primera evidencia terrestre de ringwoodita, una polimorfa de olivino a mayor presión.
- La inclusión de ringwoodita es rica en agua (aprox. 1% en peso).
- La preservación de la ringwoodita indica una zona de transición hidráulica.
Conclusiones:
- Se ha confirmado que la zona de transición de la Tierra es localmente hidráulica.
- Este hallazgo apoya el papel de una zona de transición hidrosa en el magmatismo y la tectónica de placas.
- Algunas kimberlitas probablemente se originan en esta región del manto profundo.
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