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Laboratory-determined Phosphorus Flux from Lake Sediments as a Measure of Internal Phosphorus Loading

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Descubriendo el ciclo de fósforo de Ediacaran

Matthew S Dodd^1,2,3,4,5, Wei Shi^1,3, Chao Li^6,7,8

¹State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu, China.

|May 31, 2023

Resumen

Los niveles de fósforo oceánico aumentaron durante la excursión Ediacaran Shuram, impulsando el aumento de oxígeno. Esto sugiere factores externos como la intemperie del sulfato, no sólo ciclos internos, la oxigenación controlada del océano Ediacaran.

Área de la Ciencia:

Geoquímica
Paleoceanografía
Biogeoquímica

Sus antecedentes:

El fósforo es un nutriente clave que controla los niveles de oxígeno oceánico.
El Período Ediacariano vio aumentos propuestos en el fósforo marino vinculados al aumento del oxígeno.
El ciclo del fósforo durante este tiempo crítico sigue siendo poco conocido.

Objetivo del estudio:

Reconstruir las concentraciones de fósforo oceánico durante la excursión Ediacaran Shuram (SE).
Investigar los impulsores de la oxigenación oceánica durante este período.
Comprender la relación entre el fósforo, los isótopos de carbono y los niveles de oxígeno.

Principales métodos:

Análisis del fosfato asociado al carbonato (CAP) de seis secciones globales.
Reconstrucción de las concentraciones de fósforo oceánico.
Aplicación de un modelo biogeoquímico cuantitativo

Principales resultados:

Se observaron aumentos pulsantes en las concentraciones de fósforo oceánico durante el SE.
El modelo sugiere la liberación de fósforo por la oxidación de la materia orgánica y el desgaste de la tierra.
Se encontraron concentraciones equivalentes de fósforo durante diferentes niveles de anoxia en todo el SE.

Conclusiones:

Los estímulos externos, como la intemperie de sulfato, probablemente controlaron la oxigenación del océano de Ediacaran.
Los ciclos de fósforo y oxígeno pueden haber sido desacoplados, a diferencia del océano moderno.
Esto proporciona información sobre el aumento prolongado de los niveles de oxígeno atmosférico.

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