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Simulation of the Planetary Interior Differentiation Processes in the Laboratory
Published on: November 15, 2013
Magnetita en CI Meteoritos carbonáceos: origen por actividad acuosa en una superficie planetesimal
Resumen
La magnetita en los meteoritos carbonáceos probablemente se formó en su cuerpo progenitor, no en la nebulosa solar temprana. Este hallazgo vuelve a fechar el meteorito.
Área de la Ciencia:
- Cosmoquímica es la cosmoquímica.
- Ciencias planetarias Ciencias planetarias.
- La mineralogía es la Mineralogía.
Sus antecedentes:
- La magnetita en los meteoritos carbonáceos CI exhibe características inconsistentes con la formación en la nebulosa solar primitiva.
- Los escenarios de formación alternativos, como la mineralización secundaria en los cuerpos madre de los meteoritos, requieren una investigación.
Objetivo del estudio:
- Para determinar el origen de la magnetita que se encuentra en los meteoritos carbonáceos CI.
- Reevaluar las implicaciones cronológicas de la datación de meteoritos basada en la formación de magnetitos.
Principales métodos:
- Análisis de la composición y morfología de la magnetita en meteoritos carbonáceos de CI.
- Datamiento de yodo-xenón (I-Xe) de las muestras de magnetita analizadas.
Principales resultados:
- La composición y morfología de la magnetita observada sugieren fuertemente un origen secundario.
- La formación en el cuerpo progenitor del meteorito es una explicación más plausible que la condensación nebulosa.
Conclusiones:
- La edad de yodo-xenón de esta magnetita data de la mineralización secundaria en un planeta muy pequeño.
- Esta edad no representa la época de condensación primaria en la nebulosa solar.
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