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Sedimentación pelágica de la aragonita: su importancia geoquímica
Science (New York, N.Y.)
|February 27, 1981
Resumen
La aragonita representa al menos el 12% del flujo mundial de carbonato de calcio hacia las profundidades marinas. Esta aragonita, junto con calcita alta en magnesio, puede ayudar a neutralizar el dióxido de carbono oceánico.
Área de la Ciencia:
- Geología marina Geología marina.
- Oceanografía La oceanografía es la oceanografía.
- Biogeoquímica La biogeoquímica es la bioquímica.
Sus antecedentes:
- El fondo del mar profundo recibe carbonato de calcio de fuentes pelágicas y bentónicas.
- Comprender las contribuciones relativas de la aragonita y la calcita es crucial para el ciclo del carbono marino.
- El dióxido de carbono antropogénico en los océanos plantea un desafío ambiental significativo.
Objetivo del estudio:
- Para cuantificar el flujo pelágico de la aragonita en relación con la calcita en el fondo del mar profundo.
- Para investigar los orígenes del material calcáreo que llega a las profundidades del océano.
- Evaluar el papel potencial de los carbonatos derivados de aguas poco profundas en la neutralización del CO2 oceánico.
Principales métodos:
- Análisis cuantitativo por difracción de rayos X de muestras de sedimentos.
- Recolección de muestras de trampas de sedimentos en el Océano Atlántico abierto.
- Análisis de muestras del poco profundo Rio Grande Rise.
Principales resultados:
- El flujo de aragonita constituye al menos el 12% del flujo total de carbonato de calcio a nivel mundial.
- Se detectó calcita alta en magnesio, lo que sugiere contribuciones de organismos bentónicos de aguas poco profundas.
- El transporte lateral de carbonatos de aguas poco profundas puede representar un mínimo del 12% del flujo total.
Conclusiones:
- La aragonita es un componente importante del flujo de carbonato de calcio de aguas profundas.
- Las fuentes bentónicas y planctónicas de aguas poco profundas contribuyen al material calcáreo de aguas profundas.
- La disolución de la aragonita transportada y la calcita con alto contenido de magnesio puede mitigar el CO2 antropogénico.
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