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Un vínculo entre los grandes eventos de fusión del manto y el crecimiento de los continentes visto en los isótopos de

D G Pearson¹, S W Parman, G M Nowell

¹Northern Centre for Isotopic and Elemental Tracing, Department of Earth Sciences, Durham University, South Road, Durham DH1 4QE, UK. d.g.pearson@durham.ac.uk

|September 14, 2007

Resumen

La corteza continental de la Tierra creció en pulsos, no de forma continua. Una nueva investigación que utiliza isótopos de osmio revela que los eventos de agotamiento del manto coinciden con los picos de formación de la corteza, lo que apoya un modelo de crecimiento pulsado para la corteza de nuestro planeta.

Área de la Ciencia:

La geoquímica es la geoquímica.
Geocronología Geocronología.
Ciencias planetarias Ciencias planetarias.

Sus antecedentes:

El tiempo y los mecanismos de formación de la corteza continental de la Tierra siguen siendo objeto de debate.
La distribución de la edad de la corteza muestra picos, lo que sugiere un crecimiento pulsado o un sesgo de preservación.
El sistema de desintegración del renio-187/osmio-187 (187Re-187Os) rastrea el agotamiento del manto.

Objetivo del estudio:

Para investigar el momento de los eventos de agotamiento del manto.
Para vincular la diferenciación del manto con la formación de la corteza continental.
Para probar modelos pulsados versus continuos de crecimiento de la corteza.

Principales métodos:

Se utilizó la ablación láser para analizar granos de aleación de osmio.
Composiciones cuantificadas de isótopos de osmio para determinar las edades de agotamiento.
Análisis estadístico de las edades de agotamiento de las muestras del manto superior.

Principales resultados:

Las edades de agotamiento del manto se agrupan, no se distribuyen uniformemente.
Los picos de edad de agotamiento identificados se sitúan aproximadamente en 1.2, 1.9 y 2.7 mil millones de años.
Estos eventos de agotamiento del manto se correlacionan con los picos de generación de la corteza continental.

Conclusiones:

Proporciona evidencia para la diferenciación acoplada, global y pulsada entre el manto y la corteza.
Apoya los modelos de crecimiento continental a través del derretimiento episódico y a gran escala del manto.
Destaca el papel del sistema 187Re-187Os en la comprensión de la evolución del manto de la corteza.

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