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Sandrine Péron¹, Sujoy Mukhopadhyay¹

¹Department of Earth and Planetary Sciences, University of California Davis, Davis, CA 95616, USA.

Science (New York, N.Y.)

|June 16, 2022

Resumen

Marte temprano incorporó volátiles condríticos, evidenciados por los isótopos de criptón en el meteorito Chassigny. Marte también.

Área de la Ciencia:

Ciencias planetarias
Cosmoquímica
Geoquímica de los isótopos

Sus antecedentes:

Los elementos volátiles en los planetas terrestres a menudo se atribuyen a la acreción en etapa tardía de los meteoritos condríticos.
Marte ofrece información sobre las primeras entregas volátiles durante la formación del Sistema Solar.

Objetivo del estudio:

Para investigar el origen de los volátiles en el interior y la atmósfera de Marte.
Para probar las hipótesis con respecto al momento de la entrega volátil condrítica frente a la adquisición de gas solar.

Principales métodos:

Medición de los isótopos de criptón en el meteorito marciano Chassigny, que representa el interior de Marte.
Comparación de las firmas isotópicas entre el interior marciano y la atmósfera.

Principales resultados:

El meteorito Chassigny exhibe proporciones de isótopos de criptón condrítico, lo que indica la incorporación temprana de volátiles condríticos en Marte.
El criptón atmosférico marciano muestra proporciones de isótopos de tipo solar, distintas del interior.
El criptón atmosférico se atribuye a la acreción de gas de la nebulosa solar después de la formación del manto pero antes del cierre de la nebulosa.

Conclusiones:

Los volátiles interiores de Marte se adquirieron temprano, en consonancia con la acreción condrítica.
La distintiva firma de criptón de la atmósfera marciana refuta la desgasificación o la fraccionamiento desde el interior.
La entrega volátil condrítica probablemente precedió a la adquisición de gas solar, lo que desafía los modelos convencionales.

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