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El magmatismo de Cryptomare fue registrado hace 4,35 años en el meteorito lunar Kalahari 009 Gyr
Kentaro Terada1, Mahesh Anand, Anna K Sokol
1Department of Earth and Planetary Systems Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan.
Nature
|December 8, 2007
Resumen
La datación por fosfato de un meteorito lunar antiguo revela el volcanismo basáltico temprano. Este estudio sugiere que la Luna es la Luna.
Área de la Ciencia:
- Geología lunar y ciencias planetarias.
- Geocronología y análisis isotópico.
- Procesos volcánicos en los cuerpos celestes.
Sus antecedentes:
- El origen y la evolución de la Luna son debatidos.
- Comprender el momento del magmatismo basáltico de marea lunar es crucial.
- Estudios anteriores carecen de muestras antiguas de basalto marino de Ti muy bajo.
Objetivo del estudio:
- Para determinar la edad del magmatismo basáltico en el meteorito lunar Kalahari 009.
- Para investigar la historia temprana del volcanismo de marea lunar.
- Para identificar muestras de cryptomare. muy bajo en titanio (muy bajo en Ti).
Principales métodos:
- Microsonda iónica U-Pb para la datación de fosfatos.
- Análisis in situ de granos de fosfato dentro de un meteorito lunar.
- Clasificación del meteorito como una breccia de mare-basalto de Ti muy bajo.
Principales resultados:
- Los granos de fosfato en Kalahari 009 arrojaron una edad de 4.35 ± 0.15 mil millones de años.
- Esta edad se interpreta como la edad de cristalización del magma de basalto parental.
- Kalahari 009 representa uno de los más antiguos basaltos de yegua conocidos y una muestra de criptomareas de muy bajo Ti.
Conclusiones:
- El vulcanismo de basalto marino en la Luna se inició hace 4.35 mil millones de años.
- Este volcanismo temprano ocurrió poco después de la formación y diferenciación lunar.
- Los hallazgos apoyan la existencia de criptomareas de muy bajo Ti, consistentes con los datos de teledetección.
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