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Las muestras devueltas indican volcanismo en la Luna hace 120 millones de años
Bi-Wen Wang1,2, Qian W L Zhang1, Yi Chen1
1State Key Laboratory of Lithospheric and Environmental Coevolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China.
Science (New York, N.Y.)
|September 5, 2024
Resumen
La actividad volcánica lunar persistió mucho más tarde de lo que se pensaba, con cuentas de vidrio volcánico que datan de hace 123 millones de años. Esto sugiere que el reciente volcanismo lunar puede estar relacionado con el enriquecimiento localizado del manto de elementos generadores de calor.
Área de la Ciencia:
- Geología lunar
- Geoquímica
- Cosmoquímica
Sus antecedentes:
- Extensa evidencia geológica apunta a la antigua actividad volcánica lunar.
- La duración y la persistencia del vulcanismo lunar siguen siendo inciertas.
- Los vidrios volcánicos, formados por fuentes de magma, son indicadores clave de erupciones pasadas.
Objetivo del estudio:
- Para investigar la edad de la actividad volcánica lunar.
- Para analizar las perlas de vidrio volcánico de las muestras de la misión Chang'e-5.
- Para entender las implicaciones del reciente volcanismo en la composición del manto lunar.
Principales métodos:
- Análisis de aproximadamente 3000 cuentas de vidrio de muestras de suelo lunar.
- Identificación del origen volcánico basado en la textura, la composición química y los isótopos de azufre.
- La datación con uranio y plomo de las perlas de vidrio volcánico.
Principales resultados:
- Se identificaron tres cuentas de vidrio volcánico de las muestras de Chang'e-5.
- La datación con uranio-plomo reveló que las cuentas se formaron hace 123 ± 15 millones de años.
- Se midieron grandes cantidades de elementos de tierras raras y torio en las cuentas.
Conclusiones:
- El volcanismo lunar persistió mucho más tarde de lo estimado anteriormente.
- El reciente volcanismo lunar puede estar asociado con el enriquecimiento localizado del manto de elementos generadores de calor.
- Los hallazgos proporcionan nuevos conocimientos sobre la evolución térmica de la Luna.
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