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Venas de carbonato brillante en el asteroide (101955) Bennu: Implicaciones para la historia de la alteración acuosa
H H Kaplan1,2, D S Lauretta3, A A Simon4
1NASA Goddard Space Flight Center, Greenbelt, MD, USA. hannah.kaplan@nasa.gov.
Science (New York, N.Y.)
|October 9, 2020
Resumen
El asteroide Bennu
Área de la Ciencia:
- Ciencias planetarias
- Astrogeología
- La evolución temprana del sistema solar
Sus antecedentes:
- La composición de los asteroides y las conexiones de los meteoritos revelan la geología temprana del Sistema Solar.
- El asteroide cercano a la Tierra Bennu es un asteroide carbonoso.
- Los meteoritos de condrita carbonácea muestran evidencia de alteración acuosa.
Objetivo del estudio:
- Para analizar datos espectrales de la región del cráter Nightingale de Bennu.
- Para investigar la composición de las venas brillantes observadas en las rocas de Bennu.
- Para entender los primeros procesos geológicos en los asteroides.
Principales métodos:
- Análisis espectral de la región del cráter Nightingale en el asteroide Bennu.
- Imágenes de las rocas para identificar las características de la superficie.
- Interpretación de las características de absorción espectral y las características visuales.
Principales resultados:
- Se detectó una característica de absorción infrarroja distinta de alrededor de 3,4 micrómetros en la región del cráter Nightingale.
- Se observaron venas brillantes de un metro de largo y centímetros de espesor en las rocas de Bennu.
- Estas venas se interpretan como depósitos potenciales de carbonato.
Conclusiones:
- La presencia de venas de carbonato sugiere una alteración hidrotermal a gran escala en el cuerpo principal de Bennu.
- El flujo y la deposición de fluidos se produjeron a escalas de kilómetros durante períodos prolongados.
- Esto indica la alteración hidrotermal del sistema abierto de asteroides carbonáceos en el Sistema Solar temprano.
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