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El flujo tardío de fluidos en un asteroide primitivo revelado por los isótopos de Lu-Hf en Ryugu
Tsuyoshi Iizuka1, Takazo Shibuya2, Takehito Hayakawa3
1Department of Earth and Planetary Science, The University of Tokyo, Tokyo, Japan. iizuka@eps.s.u-tokyo.ac.jp.
Nature
|September 10, 2025
Resumen
Los asteroides carbonáceos primitivos muestran evidencia de flujo de fluidos más de mil millones de años después de su formación. Esto sugiere que los asteroides entregaron más agua a la Tierra de lo estimado previamente.
Área de la Ciencia:
- * Ciencias planetarias
- * Astroquímica
- * Geoquímica
Sus antecedentes:
- * Los asteroides carbonáceos son restos primitivos del sistema solar temprano, que potencialmente pueden llevar volátiles a la Tierra.
- * Las muestras de asteroides Ryugu ofrecen información sobre las primeras interacciones fluido-roca.
- * El destino a largo plazo del agua dentro de los asteroides no se entiende bien.
Objetivo del estudio:
- * Para investigar la actividad de fluidos a largo plazo en asteroides carbonosos.
- * Comprender las implicaciones para el suministro de agua a los planetas terrestres.
Principales métodos:
- * Análisis de las sistemáticas de desintegración de 176Lu-176Hf en muestras de Ryugu.
- * Interpretación de la movilización de lutecio como evidencia de flujo tardío de fluidos.
Principales resultados:
- * La evidencia encontrada para el flujo de fluido en un asteroide carbonoso más de 1 mil millones de años después de su formación.
- * Flujo tardío de líquido probablemente provocado por un evento de impacto que causa el derretimiento y la fractura del hielo.
- * Esto contrasta con la actividad fluida limitada anterior impulsada por la desintegración radiactiva.
Conclusiones:
- * Los asteroides carbonosos podrían retener cantidades significativas de agua durante períodos prolongados.
- * Los impactos de asteroides pueden facilitar la migración de fluidos en etapa tardía.
- * El potencial de suministro de agua de planetesimales carbonosos a la Tierra puede ser subestimado por un factor de dos a tres.
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