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La subducción de la corteza rica en carbonatos impulsa los ciclos profundos de carbono y cloro

Chunfei Chen¹, Michael W Förster^2,3, Stephen F Foley^2,3

¹School of Natural Sciences, Macquarie University, North Ryde, New South Wales, Australia. chfchen2016@hotmail.com.

|August 9, 2023

Resumen

Las rocas ricas en carbonato subducidas en el manto profundo reciclan efectivamente el carbono y el cloro, influyendo en la habitabilidad de la Tierra y la composición del manto desde el Mesoproterozoico. Este proceso explica las antiguas características geológicas y los depósitos del manto.

Área de la Ciencia:

Geoquímica
Petrología
Ciencias planetarias

Sus antecedentes:

Los flujos de carbono y cloro entre el manto y la atmósfera son vitales para la habitabilidad planetaria.
Se pensó que la pérdida de líquido de las losas de subducción impedía la entrega de carbono y cloro en el manto profundo.

Objetivo del estudio:

Para investigar el destino del carbono y el cloro durante la subducción.
Para entender su papel en el ciclo profundo del carbono y la evolución del manto.

Principales métodos:

Petrología experimental de alta presión.
Análisis de las rocas de la corteza rica en carbonatos y de los fundidos de carbonatita hidratada.

Principales resultados:

La mayoría de los carbonatos (> 75% en peso) sobreviven a la desvolatilización y a la fusión en losas de subducción.
KCl y NaCl se cristalizan de los fundidos, secuestrando el cloro en los sólidos residuales.
La subducción de rocas ricas en carbonato recicla eficazmente el carbono y el cloro en el manto profundo.

Conclusiones:

La subducción de rocas ricas en carbonato ha impulsado el ciclo profundo del carbono desde el Mesoproterozoico.
Este proceso condujo a la disminución del CO2 atmosférico y la formación de depósitos de manto enriquecidos.
La subducción óptima de carbono y cloro puede explicar las edades de los diamantes eclogíticos y la formación de la fuente del manto HIMU.

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