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La carbonatita primaria se derrite desde la corteza oceánica profundamente subducida
M J Walter1, G P Bulanova, L S Armstrong
1Department of Earth Sciences, University of Bristol, Queen's Road, Bristol BS8 1RJ, UK. m.j.walter@bris.ac.uk
Nature
|August 1, 2008
Resumen
Las inclusiones de diamantes revelan que las fusiones de carbonatita, originadas en la corteza oceánica subducida, se forman en lo profundo del manto de la Tierra. Estos antiguos fundidos influyen en la geoquímica y la geodinámica del manto durante miles de millones de años.
Área de la Ciencia:
- La geoquímica es la geoquímica.
- La mineralogía es la Mineralogía.
- Petrología Petrología.
- La geodinámica es la geodinámica.
Sus antecedentes:
- La fusión parcial en el manto de la Tierra genera diversidad geoquímica en las rocas volcánicas.
- Los reservorios geoquímicos del manto y los procesos geodinámicos están vinculados a las composiciones de fusión primarias.
- Las inclusiones minerales en los diamantes ofrecen información sobre los procesos del manto profundo.
Objetivo del estudio:
- Para identificar la composición de carbonatita primaria y evolucionada se funde en el manto.
- Para vincular los reservorios geoquímicos del manto con los procesos geodinámicos utilizando inclusiones de diamantes.
- Para entender el papel de la corteza subducida en la evolución del manto.
Principales métodos:
- Petrología experimental petrología experimental.
- Análisis geoquímico de las inclusiones minerales en los diamantes.
- Cálculos de la abundancia de los oligoelementos.
Principales resultados:
- Las inclusiones de minerales de silicato en los diamantes de Juina se cristalizan a partir de carbonatito fundido.
- Las inclusiones de fusión indican la fusión de la corteza oceánica carbonatada en las profundidades de la zona de transición.
- Las inclusiones de granate registran la cristalización de fundidos evolucionados que se asemejan a las carbonatitas primitivas.
Conclusiones:
- Los fundidos de carbonatita derivados de la corteza subducida son agentes significativos de la transferencia de masa química en el manto.
- Estas fusiones dejan una huella química duradera en el manto superior y en la zona de transición.
- Las inclusiones de diamantes proporcionan evidencia crucial para los procesos del manto profundo y las interacciones entre la corteza y el manto.
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