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Impacto de la formación de arcillas autigénicas en el ciclo de elementos traza marinos

Stefan C Löhr¹, April N Abbott², Andre Baldermann³

¹School of Physics, Chemistry and Earth Sciences, Adelaide University, Adelaide, SA, Australia. stefan.loehr@adelaide.edu.au.

Nature communications

|February 20, 2026

Resumen

La formación de arcillas autigénicas marinas impacta significativamente el ciclo de elementos traza oceánicos. Estas arcillas actúan como sumideros y fuentes de elementos, influyendo en la química del agua de mar más de lo que se entendía previamente.

Área de la Ciencia:

Geoquímica
Geología Marina
Oceanografía

Sus antecedentes:

El ciclo de elementos traza oceánicos es crucial para la vida marina.
El papel de la formación de arcillas autigénicas en este ciclo no se comprende bien.

Objetivo del estudio:

Investigar el impacto de las arcillas verdes autigénicas en el ciclo de elementos traza oceánicos.
Cuantificar el papel de las arcillas autigénicas como sumideros o fuentes de elementos traza.

Principales métodos:

Análisis de conjuntos de datos completos de elementos traza y principales de arcillas verdes autigénicas (serie Fe-esméctita y glauconita).
Comparación de la composición elemental entre arcillas autigénicas y sus precursores detríticos.

Principales resultados:

Las arcillas autigénicas son deficientes en elementos como Cu, Ba, REE, Nb, Ti y Al, liberándolos en el agua de mar.
Las arcillas autigénicas son ricas en elementos como B, Fe, Cs, K, Mg, Rb, Be, Cr, V, Zn, Co, Sc y Ga, lo que indica la absorción del agua de los poros.
Los patrones de REE y la composición isotópica de Nd se heredan de precursores detríticos, mostrando controles de disolución-recristalización.

Conclusiones:

La formación de arcillas autigénicas es un proceso clave que controla los presupuestos de elementos traza oceánicos.
La autigénesis representa un término de sumidero o fuente significativo, previamente subestimado, para numerosos elementos traza en el océano.

Palabras clave:

arcillas autigénicas elementos traza ciclo oceánico química del agua de mar tierras raras isótopos de neodimio

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