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La sistemática de isótopos Ru y W en los basaltos de las islas oceánicas revela fugas en el núcleo

Nils Messling¹, Matthias Willbold², Leander Kallas²

¹Department for Geochemistry and Isotope Geology, Georg-August-Universität Göttingen, Göttingen, Germany. nilsmessling@gmail.com.

|May 21, 2025

Resumen

Las anomalías de isótopos de rutenio (Ru) en los basaltos hawaianos sugieren que el material del núcleo ha alcanzado la superficie de la Tierra. Esto proporciona evidencia de la interacción núcleo-manto, una huella digital largamente buscada del interior profundo de la Tierra.

Área de la Ciencia:

Geoquímica
Geoquímica de los isótopos
Ciencias planetarias

Sus antecedentes:

Se cree que las plumas del manto transportan material desde el núcleo de la Tierra.
Las interpretaciones anteriores se basaban en pruebas indirectas, que carecían de una huella digital definitiva.
Los metales preciosos como el rutenio (Ru) están concentrados en el núcleo y agotados en el manto.

Objetivo del estudio:

Para investigar las anomalías del isótopo de rutenio (Ru) en los basaltos de las islas oceánicas.
Utilizar isótopos de Ru como un nuevo marcador para la interacción núcleo-manto.
Para confirmar o refutar la presencia de material de núcleo en las plumas del manto.

Principales métodos:

Análisis de las variaciones de isótopos de rutenio (Ru) (ε100Ru) en los basaltos hawaianos.
Medición de las proporciones de isótopos no radiogénicos de tungsteno (W).
Comparación de las firmas isotópicas con el manto ambiental y las composiciones del núcleo.

Principales resultados:

Los basaltos hawaianos exhiben un ε100Ru más alto que el manto ambiental.
Los datos combinados de isótopos Ru y W indican una contribución principal a las fuentes de basalto.
La sistemática isotópica es consistente con el arrastre del núcleo o la adición de óxidos derivados del núcleo.

Conclusiones:

Los isótopos de rutenio (Ru) sirven como un nuevo y poderoso marcador para la interacción núcleo-manto.
Los basaltos hawaianos proporcionan evidencia convincente de que el material del núcleo llega a la superficie a través de las plumas del manto.
Los hallazgos apoyan modelos que implican la transferencia directa o indirecta de material central en el manto.

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