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Un meteorito único de los primeros tiempos del Amazonas en Marte: una breccia basáltica rica en agua en el noroeste
Carl B Agee1, Nicole V Wilson, Francis M McCubbin
1Institute of Meteoritics, University of New Mexico, Albuquerque, NM 87131, USA. agee@unm.edu
Science (New York, N.Y.)
|January 5, 2013
Resumen
El meteorito marciano Noroeste de África (NWA) 7034, distinto de los meteoritos SNC, revela un significativo contenido de agua autóctona y isótopos únicos de oxígeno. Este hallazgo sugiere que múltiples depósitos de oxígeno existieron en Marte durante su historia temprana.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- La geoquímica es la geoquímica.
- Análisis de Isótopos Análisis de Isótopos
Sus antecedentes:
- Los meteoritos marcianos proporcionan información sobre la historia geológica y la composición de Marte.
- El grupo SNC (Shergottite, Nakhlite, Chassignite) representa los meteoritos marcianos conocidos.
- Noroeste de África (NWA) 7034 es un meteorito marciano descubierto recientemente con características únicas.
Objetivo del estudio:
- Para analizar las propiedades petrológicas y geoquímicas del meteorito marciano NWA 7034.4.
- Para comparar NWA 7034 con meteoritos SNC conocidos y la composición media de la corteza marciana.
- Para investigar el contenido de agua indígena y los depósitos de isótopos de oxígeno dentro de NWA 7034.4.
Principales métodos:
- Análisis petrológico y geoquímico de NWA 7034.
- Experimentos de calentamiento escalonado para cuantificar el H2O extraterrestre.
- Análisis de isótopos de oxígeno (a granel y agua liberada por calor).
Principales resultados:
- NWA 7034 exhibe características únicas que lo diferencian de los meteoritos SNC.
- El meteorito es una roca cortical geoquímicamente enriquecida, similar a los basaltos marcianos y a la corteza media.
- NWA 7034 contiene agua indígena significativamente más alta (hasta 6000 ppm H2O) que la mayoría de los meteoritos SNC.
- Los valores de isótopos de oxígeno (en masa Δ(17) O = 0.58 ± 0.05‰; agua Δ(17) O = 0.330 ± 0.011‰) sugieren múltiples depósitos de oxígeno en Marte.
Conclusiones:
- NWA 7034 representa un tipo distinto de meteorito marciano, posiblemente de la corteza marciana.
- El alto contenido de agua indica una presencia significativa de agua en la época amazónica temprana de Marte.
- Los distintos valores de isótopos de oxígeno apoyan la hipótesis de múltiples y heterogéneos depósitos de oxígeno en Marte.
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