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Agua en los meteoritos SNC: evidencia de una hidrosfera marciana
H R Karlsson1, R N Clayton, E K Gibson
1Planetary Science Branch, National Aeronautics and Space Administration, Johnson Space Center, Houston, TX 77058.
Science (New York, N.Y.)
|March 13, 1992
Resumen
El agua que se encuentra en los meteoritos marcianos (SNCs) es extraterrestre. El análisis de isótopos de oxígeno revela depósitos distintos, lo que sugiere que Marte puede carecer de tectónica de placas, un factor clave para mantener separadas las composiciones de agua y roca.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- La geoquímica es la geoquímica.
- Astrobiología Astrobiología.
Sus antecedentes:
- Se cree que los meteoritos Shergotty-Nakhla-Chassigny (SNC) se originaron en Marte.
- Estos meteoritos contienen cantidades significativas de agua (0,04-0,4% en peso).
- Determinar el origen y la naturaleza de esta agua es crucial para comprender la historia marciana.
Objetivo del estudio:
- Para investigar el origen del agua dentro de los meteoritos SNC.
- Para determinar si el agua está en equilibrio isotópico con su roca anfitriona.
- Para inferir implicaciones para los procesos geológicos en el cuerpo progenitor, potencialmente Marte.
Principales métodos:
- Análisis isotópico de oxígeno del agua y la roca anfitriona dentro de los meteoritos SNC.
- Comparación de las firmas isotópicas para distinguir entre agua terrestre y extraterrestre.
- Evaluación del equilibrio isotópico entre las diferentes reservas planetarias.
Principales resultados:
- Se confirmó que una parte del agua en los meteoritos SNC era extraterrestre.
- Se descubrió que esta agua extraterrestre estaba fuera del equilibrio isotópico de oxígeno con la roca anfitriona.
- Esto indica la formación de dos reservas isotópicas de oxígeno distintas (litosfera e hidrosfera).
Conclusiones:
- Los meteoritos SNC contienen agua extraterrestre que no ha interactuado isotópicamente con la roca huésped.
- La presencia de distintos depósitos isotópicos de oxígeno litosféricos e hidrosféricos sugiere una falta de mezcla generalizada.
- Si Marte es el cuerpo padre, esta falta de equilibrio puede atribuirse a la ausencia de tectónica de placas.
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