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La familia de asteroides Massalia como el origen de las condritas L ordinarias
M Marsset1,2, P Vernazza3, M Brož4
1European Southern Observatory (ESO), Santiago, Chile. mmarsset@eso.org.
Nature
|October 16, 2024
Resumen
La familia de colisiones Massalia es identificada como la fuente de una caída masiva de meteoritos hace 466 millones de años. Este evento probablemente causó una edad de hielo del Ordovícico y está relacionado con las caídas de meteoritos más comunes de hoy.
Área de la Ciencia:
- Impactos cósmicos y paleoclimatología
- Dinámica de asteroides y orígenes de meteoritos
Sus antecedentes:
- La evidencia sugiere una caída masiva de material de condrita L hace ~ 466 millones de años.
- Este evento puede haber desencadenado una edad de hielo del Ordovícico y cambios significativos en la biodiversidad.
- La ruptura de un gran asteroide en el cinturón principal es la causa sospechosa de esta caída.
Objetivo del estudio:
- Para identificar la fuente de la antigua caída de meteoritos de condrita L.
- Para determinar el origen de la clase de meteorito más abundante que cae en la Tierra hoy en día.
Principales métodos:
- Observaciones espectroscópicas de los asteroides.
- Análisis dinámico de las familias de asteroides.
- Comparación con las distribuciones de meteoritos y objetos cercanos a la Tierra.
Principales resultados:
- La familia de colisiones Massalia se identifica como la única fuente plausible.
- La ubicación y las características orbitales de esta familia coinciden con las distribuciones de condritas L.
- El material de esta familia constituye más del 20% de las caídas de meteoritos actuales.
Conclusiones:
- La familia Massalia es responsable del catastrófico evento del meteorito del Ordovícico.
- Esta familia es el origen de los meteoritos más comunes observados hoy en día.
- Comprender esta familia proporciona una visión de la historia del impacto de la Tierra y la biodiversidad.
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