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Las mediciones de abundancia elemental de Chandrayaan-3 APXS en la latitud alta lunar
Santosh V Vadawale1, N P S Mithun2, M Shanmugam2
1Physical Research Laboratory (PRL), Ahmedabad, India. santoshv@prl.res.in.
Nature
|August 21, 2024
Resumen
La India
Área de la Ciencia:
- Geología lunar y ciencias planetarias.
- Análisis elemental in situ de cuerpos extraterrestres.
Sus antecedentes:
- La composición del regolito lunar es clave para comprender la formación y evolución de la Luna.
- Los estudios anteriores de composición elemental se limitaron a las regiones ecuatoriales y de latitudes medias.
- Las mediciones in situ de misiones anteriores proporcionaron datos de latitudes medias.
Objetivo del estudio:
- Informar las primeras mediciones de abundancia de elementos in situ de las regiones lunares de latitudes altas del sur.
- Para analizar la composición del terreno lunar cerca del sitio de aterrizaje de Chandrayaan-3.
- Para proporcionar la verdad de fondo para las observaciones de teledetección.
Principales métodos:
- Utilizó el experimento de espectrómetro de rayos X de partículas alfa (APXS) a bordo del rover Pragyan.
- Se realizaron 23 mediciones in situ en las cercanías del sitio de aterrizaje de Chandrayaan-3.
- Se analizaron las abundancias elementales, centrándose en los indicadores de anortosita ferrosa (FAN) y material máfico.
Principales resultados:
- El terreno lunar en la región de latitudes altas del sur es compositivamente uniforme.
- La composición primaria es la anortosita ferrosa (FAN), indicativa de la cristalización del océano de magma lunar (LMO).
- El aumento de magnesio en relación con el calcio sugiere la presencia de material máfico mixto.
Conclusiones:
- La composición elemental de la región de latitudes altas del sur lunar es principalmente anortosita ferrosa con mezcla de material máfico.
- La uniformidad de composición en esta región se confirma en varias decenas de metros.
- Estos hallazgos ofrecen una verdad fundamental valiosa para interpretar los datos de teledetección de las regiones polares lunares.
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