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Cronometría de niobio-zirconio y desarrollo temprano del sistema solar
Maria Schönbächler1, Mark Rehkämper, Alex N Halliday
1Institute of Isotope Geology and Mineral Resources, ETH Zürich, 8092 Zürich, Switzerland. maria@erdw.ethz.ch
Science (New York, N.Y.)
|March 2, 2002
Resumen
La desintegración del niobio-92 (92Nb) proporciona información sobre los primeros procesos del sistema solar. Una nueva investigación indica que la relación inicial del sistema solar 92Nb/93Nb era baja (<3 x 10(-5)), lo que desafía las altas estimaciones anteriores e impacta en los modelos de diferenciación planetaria.
Área de la Ciencia:
- Cosmoquímica es la cosmoquímica.
- La astrofísica nuclear es una astrofísica nuclear.
- Ciencias planetarias Ciencias planetarias.
Sus antecedentes:
- La desintegración del niobio-92 (92Nb) al zirconio-92 (92Zr) con una vida media de 36 millones de años ofrece un cronómetro para la nucleosíntesis y los primeros eventos del sistema solar.
- Estudios previos sugirieron una alta abundancia inicial de 92Nb/93Nb en el sistema solar, que potencialmente podría exceder 10−3.
Objetivo del estudio:
- Para determinar la relación inicial 92Nb/93Nb del sistema solar.
- Reevaluar las implicaciones para el momento de la diferenciación inicial de la Tierra.
Principales métodos:
- Análisis de los isócronos internos del niobio-zirconio (Nb-Zr).
- Utilizando muestras de meteoritos: la condrita común Estacado (H6) y la mesosiderita Vaca Muerta.
Principales resultados:
- Los isócronos de Nb-Zr tanto de Estacado como de Vaca Muerta producen consistentemente una relación inicial de 92Nb/93Nb de aproximadamente 10...-5).
- Esto implica que la relación inicial del sistema solar fue inferior a 3 x 10 (−5).
Conclusiones:
- La relación 92Nb/93Nb inicial del sistema solar fue significativamente más baja de lo propuesto anteriormente.
- Esta relación más baja sugiere que la diferenciación inicial de la Tierra puede no haber requerido un período prolongado, como algunos modelos habían indicado.
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