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La configuración continental controla la oxigenación del océano durante el Fanerozoico
Alexandre Pohl1,2, Andy Ridgwell3, Richard G Stockey4
1Department of Earth and Planetary Sciences, University of California, Riverside, Riverside, CA, USA. alexandre.pohl@u-bourgogne.fr.
Nature
|August 17, 2022
Resumen
La deriva continental, no el oxígeno atmosférico, alteró profundamente los niveles de oxígeno oceánico a lo largo del Eón Fanerozoico. Esta investigación revela nuevos conocimientos sobre la evolución de los animales marinos y las causas de su extinción.
Área de la Ciencia:
- Ciencias del Sistema Terrestre
- Paleoceanografía
- Biología marina
Sus antecedentes:
- La evolución y la extinción de los animales marinos están históricamente vinculadas a los niveles de oxígeno disuelto (O2) oceánico.
- Se cree ampliamente que el oxígeno oceánico está controlado principalmente por los niveles de oxígeno atmosférico (pO2).
Objetivo del estudio:
- Para investigar el impacto de la reorganización continental en la oxigenación del océano durante el Eón Fanerozóico.
- Para explorar la relación entre la configuración continental, la circulación oceánica y la evolución de la vida marina.
Principales métodos:
- Utilizó experimentos del modelo del sistema de la Tierra para simular la oxigenación del océano.
- Analizó los efectos de la deriva continental en la circulación global del océano y la distribución de oxígeno.
Principales resultados:
- El reordenamiento continental conduce a variaciones significativas en la oxigenación del océano, desacoplando el océano superior y el bentónico.
- Transiciones de estado identificadas en la circulación oceánica que conducen a la anoxia oceánica profunda del Fanerozoico temprano, incluso a los niveles de oxígeno atmosférico modernos (pO 2).
- La oxigenación del océano oscila durante períodos de miles de años (kyr), independientemente del clima global o de la atmósfera.
Conclusiones:
- La configuración continental juega un papel crucial y previamente no reconocido en la evolución de la biosfera al impulsar los ciclos de oxigenación del océano.
- Los hallazgos desafían la interpretación de los representantes redox marinos y el vínculo directo entre el oxígeno atmosférico y la oxigenación del océano.
- El estudio proporciona un mecanismo para la radiación de metazoos y los patrones de extinción observados en la Era Paleozoica temprana.
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