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Formación y composición de la protocorteza Hadeana de la Tierra
Simon Turner1, Bernard Wood2, Tim Johnson3
1School of Natural Sciences, Macquarie University, Sydney, New South Wales, Australia. simon.turner@mq.edu.au.
Nature
|April 2, 2025
Resumen
La Tierra temprana
Área de la Ciencia:
- Geoquímica
- Ciencias planetarias
- La evolución temprana de la Tierra
Sus antecedentes:
- Los planetas terrestres, incluida la Tierra, formaron una protocorteza temprana de un océano de magma.
- La composición química de esta corteza temprana sigue siendo poco explorada.
- La diferenciación del océano de magma ocurrió después de la formación del núcleo, lo que influyó en la composición de la protocrusta.
Objetivo del estudio:
- Para investigar la composición química de la primera corteza de la Tierra.
- Para determinar si la protocorteza temprana poseía características similares a las de la corteza continental moderna.
- Reevaluar los modelos de la tectónica de placas temprana y la formación de la corteza continental.
Principales métodos:
- Análisis de datos experimentales y cronológicos relacionados con la diferenciación del océano de magma.
- Modelado de la composición química de una protocorteza formada bajo condiciones específicas de la Tierra temprana.
- Comparación de la composición modelada de la protocorteza con la corteza continental promedio actual.
Principales resultados:
- Una protocosta formada después de la extracción del núcleo exhibiría características de oligoelementos incompatibles.
- Estas características se parecen mucho a las de la corteza continental promedio actual.
- La protocorteza de Hadeo probablemente poseía una firma de oligoelementos continentales.
Conclusiones:
- La firma de oligoelementos continentales puede ser una característica primordial de la corteza terrestre.
- La subducción no puede ser el único mecanismo para generar la firma de oligoelementos continentales.
- Este hallazgo desafía los modelos existentes para el inicio de la tectónica de placas y la evolución continental.
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