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Frustración de impacto del origen de la vida
1Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena 91125, USA.
Nature
|February 18, 1988
Resumen
El origen de la vida en la Tierra puede definirse por el momento en que los impactos se volvieron menos frecuentes que la escala de tiempo para la abiogénesis. Las fuentes hidrotermales marinas profundas sugieren que la vida podría haber comenzado hace 4.000-4.200 millones de años.
Área de la Ciencia:
- Astrobiología Astrobiología.
- Geología Geología Geología.
- El origen de la vida Estudios sobre el origen de la vida
Sus antecedentes:
- Las épocas Hadeano y Arcaico Temprano se caracterizaron por intensos impactos de asteroides.
- La abiogénesis, el origen de la vida a partir de la materia inorgánica, es un evento clave en la historia de la Tierra.
Objetivo del estudio:
- Para definir el origen de la vida basado en la frecuencia de impacto y las escalas de tiempo de la abiogénesis.
- Para estimar cuándo podría haber ocurrido la abiogénesis en diferentes entornos de la Tierra primitiva.
Principales métodos:
- Analizar los registros de impactos lunares y terrestres para cuantificar el flujo de impacto del Hadeano y el Arcaico Temprano.
- Estimación de los efectos de los procesos relacionados con el impacto en los entornos de abiogénesis propuestos.
- Cálculo del marco de tiempo potencial para la abiogénesis basado en los intervalos de impacto y la idoneidad ambiental.
Principales resultados:
- La abiogénesis podría haber ocurrido ya hace entre 4.000 y 4.200 millones de años en entornos hidrotermales marinos profundos.
- En la superficie de la Tierra, la abiogénesis pudo haber ocurrido hace entre 3.700 y 4.000 millones de años.
- La escala de tiempo para el establecimiento de auto-replicantes proto-organismos es un factor crítico.
Conclusiones:
- El momento del origen de la vida está limitado por la disminución de la frecuencia de los impactos devastadores.
- Los diferentes entornos de la Tierra primitiva, como los respiraderos hidrotermales frente a las ubicaciones de la superficie, ofrecen distintas posibilidades para el momento de la abiogénesis.
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