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Oxigenación del Precámbrico tardío; inicio de la fábrica de minerales de arcilla
Martin Kennedy1, Mary Droser, Lawrence M Mayer
1Department of Earth Science, University of California Riverside, Riverside, CA 92521, USA. martink@mail.ucr.edu
Science (New York, N.Y.)
|February 4, 2006
Resumen
La expansión de la vida animal temprana fue permitida por un aumento en el oxígeno atmosférico, impulsado por el aumento de la deposición de minerales de arcilla. Este proceso, vinculado a la evolución temprana de las plantas terrestres, impulsó el enterramiento de carbono orgánico.
Área de la Ciencia:
- La geoquímica es la geoquímica.
- Paleontología Paleontología.
- La sedimentología sedimentológica.
Sus antecedentes:
- El evento de oxigenación del Precámbrico tardío es crucial para la evolución de la vida animal.
- El enterramiento de carbono orgánico, esencial para la acumulación de oxígeno, está influenciado por los minerales de arcilla en los entornos marinos.
Objetivo del estudio:
- Para investigar el papel de la deposición mineral de arcilla en la oxigenación del Neoproterozoico.
- Explorar el vínculo entre la biota terrestre primitiva y la hipótesis de la "fábrica de minerales de arcilla".
Principales métodos:
- Análisis de la evidencia mineralógica y geoquímica de la era Neoproterozoica.
- Comparación de los orígenes modernos de los minerales de arcilla con los patrones de deposición antiguos.
Principales resultados:
- La evidencia muestra un aumento en la deposición de minerales arcillosos inmediatamente antes de los primeros metazoos.
- Los minerales pedogénicos de arcilla, originarios de suelos biológicamente activos, probablemente aumentaron debido a la biota terrestre temprana.
Conclusiones:
- La expansión de la biota terrestre primitiva mejoró la producción de minerales pedogénicos de arcilla.
- El aumento de la deposición mineral de arcilla facilitó un mayor enterramiento marino de carbono orgánico, apoyando la oxigenación.
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