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Simulation of the Planetary Interior Differentiation Processes in the Laboratory
Published on: November 15, 2013
La cronología absoluta y el procesamiento térmico de los sólidos en el disco protoplanetario solar
James N Connelly1, Martin Bizzarro, Alexander N Krot
1Centre for Star and Planet Formation and Natural History Museum of Denmark, University of Copenhagen, DK-1350 Copenhagen, Denmark. connelly@snm.ku.dk
Science (New York, N.Y.)
|November 3, 2012
Resumen
Las inclusiones ricas en calcio y aluminio (CAI) y las cóndrulas se formaron juntas al principio del sistema solar. Su formación se produjo durante un breve período similar, desafiando las ideas anteriores de una brecha de tiempo.
Área de la Ciencia:
- Evolución cósmica de la evolución cósmica.
- Ciencias planetarias Ciencias planetarias.
- Geocronología Geocronología.
Sus antecedentes:
- La formación de inclusiones ricas en calcio y aluminio (CAI) y cóndrulas son eventos clave en el sistema solar temprano.
- Comprender el momento preciso de estos eventos es crucial para los modelos de evolución del sistema solar.
- Estudios previos sugirieron una brecha cronológica entre el CAI y la formación de la cóndula.
Objetivo del estudio:
- Para determinar las edades absolutas de los CAI individuales y chondrules.
- Para establecer la relación cronológica entre el CAI y la formación de la cóndula.
- Para refinar los modelos de la evolución del disco protoplanetario solar.
Principales métodos:
- Utilizó técnicas de datación de plomo-plomo corregido con U (Pb-Pb).
- Analizó CAIs individuales y cóndrulos de meteoritos primitivos.
- Análisis geocronológico aplicado de alta precisión.
Principales resultados:
- Los CAI se formaron en un estrecho intervalo hace 4567.30 ± 0.16 millones de años.
- La formación de la cóndula se extendió desde hace 4567.32 ± 0.42 a 4564.71 ± 0.30 millones de años.
- La formación de chondrules comenzó simultáneamente con las CAI y continuó durante aproximadamente 3 millones de años.
Conclusiones:
- El estudio refuta una brecha de edad significativa entre los CAI y las chondrulas.
- CAI y la formación de chondrule eran procesos superpuestos y contemporáneos.
- La escala de tiempo observada se alinea con las vidas inferidas del disco solar, lo que sugiere un vínculo con la evolución del disco.
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