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Determinar la fuente de un meteorito lunar: implicaciones para la evolución de la Luna
Edwin Gnos1, Beda A Hofmann, Ali Al-Kathiri
1Institut für Geologie, Universität Bern, Baltzerstrasse 1, CH-3012 Bern, Switzerland. gnos@geo.unibe.ch
Science (New York, N.Y.)
|August 3, 2004
Resumen
El meteorito lunar Sayh al Uhaymir 169, rico en elementos de tierras raras, revela cuatro antiguos impactos lunares. Su composición lo vincula con la cuenca Imbrium y el cráter Lalande.
Área de la Ciencia:
- La geoquímica es la geoquímica.
- La ciencia lunar es la ciencia lunar.
- Geología planetaria Geología planetaria.
Sus antecedentes:
- Los meteoritos lunares proporcionan información sobre la composición de la Luna y su historia de impacto.
- El meteorito Sayh al Uhaymir 169 (SAU 169) es una breccia de fusión de impacto con un enriquecimiento elemental inusual.
Objetivo del estudio:
- Para analizar la composición y la sistemática isotópica del meteorito lunar SAU 169.
- Para determinar el historial de impacto registrado por el meteorito.
- Para identificar la región de origen del meteorito en la Luna.
Principales métodos:
- Análisis geoquímico de elementos principales y oligoelementos, incluidos los elementos de tierras raras, torio, uranio y potasio.
- Análisis sistemático de isótopos hasta la fecha de eventos de impacto.
- Comparación de datos de meteoritos con características geológicas lunares y modelos de impacto.
Principales resultados:
- SAU 169 es extremadamente enriquecido en potasio, elementos de tierras raras y fósforo.
- Los datos de isótopos indican cuatro distintos eventos de impacto lunar en aproximadamente 3909 Ma, 2800 Ma, 200 Ma, y <0,34 Ma.
- El meteorito impactó en la Tierra después de 9.7 +/- hace 1.3 mil años.
Conclusiones:
- El componente de breccia de fusión por impacto de SAU 169 puede vincularse con la cuenca de Imbrium.
- La región de origen del meteorito SAU 169 se identifica como el cráter de impacto Lalande.
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