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Historia de la acreción volátil de los planetas terrestres y sus implicaciones dinámicas
1Ecole Normale Supérieure de Lyon, Université Claude-Bernard Lyon 1, and CNRS, 46 allée d'Italie, 69007 Lyon, France. albarede@ens-lyon.fr
Nature
|October 30, 2009
Resumen
La Tierra y la Luna adquirieron agua mucho después de su formación a partir de asteroides húmedos, crucial para la tectónica de placas y la vida. Este suministro de agua alcanzó su punto máximo 100 millones de años después del aislamiento del Sistema Solar.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- La geoquímica es la geoquímica.
- Astrobiología Astrobiología.
Sus antecedentes:
- Los planetas terrestres, incluyendo la Tierra y la Luna, fueron inicialmente agotados en componentes volátiles debido a procesos de acreción.
- La formación de la Luna a través de un impacto gigante probablemente dejó a la proto-Tierra y la Luna en un estado en gran parte anhidro.
Objetivo del estudio:
- Para investigar la hipótesis de que la Tierra y la Luna adquirieron volátiles, particularmente agua, mucho más tarde en su historia.
- Para explorar el momento y la fuente de la entrega volátil en etapa tardía al Sistema Solar interior.
- Evaluar las implicaciones de este suministro de agua para el surgimiento de la tectónica de placas y la vida en la Tierra.
Principales métodos:
- Análisis de las cronologías U-Pb (uranio-plomo) y I-Xe (yodo-xenón).
- Interpretación de datos isotópicos para limitar el tiempo de los eventos de entrega volátiles.
Principales resultados:
- La datación U-Pb e I-Xe indica un pico en el suministro de agua aproximadamente 100 millones de años después del aislamiento del Sistema Solar.
- Esta acreción volátil tardía sugiere que la Tierra y la Luna fueron inicialmente una formación seca posterior a la Luna.
Conclusiones:
- La acreción tardía de material húmedo de más allá del cinturón de asteroides es un mecanismo plausible para la adquisición de agua de la Tierra.
- La introducción de agua en el manto de la Tierra probablemente desencadenó la tectónica de placas, un factor clave para el surgimiento de la vida.
- Este modelo de entrega volátil puede aplicarse a Venus, pero parece menos exitoso para Marte.
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