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Evolución de las rocas aluviales forzadas por las primeras plantas terrestres

William J McMahon¹, Neil S Davies²

¹Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, UK.

Science (New York, N.Y.)

|March 3, 2018

Resumen

Las plantas terrestres aumentaron dramáticamente la cantidad de lodo en la Tierra. Este estudio muestra que la proporción de roca de barro aumentó después de que la vegetación evolucionó, impactando la historia y el clima de la Tierra.

Área de la Ciencia:

Ciencias de la Tierra
Paleontología
Sedimentología

Sus antecedentes:

Las mudrocks son archivos cruciales de la historia de la Tierra, que influyen en la química del océano y el clima.
La comprensión de la formación de rocas de barro es clave para reconstruir entornos pasados.

Objetivo del estudio:

Investigar el vínculo entre la evolución de las plantas terrestres y la proporción de lodo retenido en la tierra.
Para cuantificar los cambios en la deposición de rocas de barro a lo largo de la historia de la Tierra.

Principales métodos:

Análisis de datos estratigráficos de 704 formaciones aluviales que abarcan los períodos Arcaico a Carbonífero.
Comparación de las proporciones de roca de barro en depósitos sedimentarios antes y después de la evolución de las plantas terrestres.

Principales resultados:

Un aumento significativo en la proporción de lodo retenido en la tierra se produjo después de la evolución de las plantas terrestres.
Esta oleada de rocas de barro comenzó en el período Ordovícico-Silúrico.
El aluvión post-vegetación contiene, en promedio, 1,4 órdenes de magnitud más roca de barro que el aluvión pre-vegetación.

Conclusiones:

La evolución de la vegetación alteró fundamentalmente la producción de lodo y el flujo de sedimentos de los continentes.
Este cambio en la deposición de rocas de barro ha tenido un profundo impacto a largo plazo en la química del océano y la regulación del clima.

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