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Origen y evolución de la materia orgánica prebiótica como se deduce del meteorito del lago Tagish
Christopher D K Herd1, Alexandra Blinova, Danielle N Simkus
1Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, Alberta T6G 2E3, Canada. herd@ualberta.ca
Science (New York, N.Y.)
|June 11, 2011
Resumen
Los materiales orgánicos en los meteoritos probablemente se formaron en el espacio y se alteraron en los asteroides. Los fragmentos de meteoritos del lago Tajic muestran que estas alteraciones se correlacionan con la alteración acuosa, formando moléculas prebióticas.
Área de la Ciencia:
- Astrogeología y Astrogeología.
- La geoquímica orgánica es la geoquímica orgánica.
- Cosmoquímica es la cosmoquímica.
Sus antecedentes:
- Los meteoritos de condrita carbonosa contienen materiales orgánicos complejos originados en el medio interestelar o en el disco protoplanetario solar.
- Estos materiales se modifican dentro de los cuerpos progenitores de los asteroides, pero los mecanismos de formación y alteración siguen siendo poco conocidos.
Objetivo del estudio:
- Para investigar las variaciones en la mineralogía, petrología y materia orgánica dentro del meteorito del lago Tagish.
- Para correlacionar estas variaciones con los procesos de alteración acuosa del cuerpo madre.
Principales métodos:
- Análisis sistemático de fragmentos distintos del meteorito del lago Tagish.
- Examen de la mineralogía, la petrología y la materia orgánica soluble e insoluble.
Principales resultados:
- Las variaciones observadas en la composición del meteorito se correlacionan con los indicadores de alteración acuosa en el cuerpo madre.
- La evidencia sugiere que las moléculas prebióticas se formaron durante este proceso de alteración acuosa.
Conclusiones:
- La alteración acuosa en los cuerpos padres de los asteroides juega un papel importante en la modificación del material orgánico de los meteoritos.
- Este proceso puede conducir a la formación de moléculas cruciales para el origen de la vida.
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