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La apatita lunar con abundancias volátiles terrestres también es abundante.
Jeremy W Boyce1, Yang Liu, George R Rossman
1Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125-2500, USA. jwboyce@alum.mit.edu
Nature
|July 24, 2010
Resumen
Las rocas lunares, específicamente el basalto 14053, contienen niveles sorprendentes de hidrógeno (H), cloro (Cl) y azufre (S) en la apatita. Estos hallazgos sugieren que la Luna puede ser más rica en volátiles de lo que se creía anteriormente.
Área de la Ciencia:
- La geoquímica es la geoquímica.
- La ciencia lunar es la ciencia lunar.
- Ciencias planetarias Ciencias planetarias.
Sus antecedentes:
- La Luna generalmente se considera agotada en elementos volátiles en comparación con la Tierra.
- La evidencia del vulcanismo explosivo lunar sugiere que algunos magmas exsolvieron fases de vapor ricas en CO.
- Investigaciones anteriores carecían de evidencia inequívoca de hidrógeno (H) indígena en las rocas lunares.
Objetivo del estudio:
- Para investigar el contenido volátil de apatita en etapa tardía en el basalto lunar 14053.3.
- Para comparar las concentraciones volátiles con las que se encuentran en las rocas ígneas terrestres.
- Para evaluar las implicaciones para el inventario volátil de la Luna y la composición del manto.
Principales métodos:
- Se realizaron mediciones cuantitativas de microsondas de iones en muestras de apatita del basalto lunar 14053.3.
- Se analizaron las concentraciones de hidrógeno (H), cloro (Cl) y azufre (S).
- Se consideraron modelos de formación de apatitas (metamórficas y ígneas).
Principales resultados:
- La apatita del basalto lunar 14053 muestra concentraciones de H, Cl y S comparables a las apatitas terrestres.
- El contenido volátil sugiere adición posmagmática o cristalización a partir de un fundido rico en volátiles (aprox. 1600 ppm de H2O y 3500 ppm de Cl).
- Tanto los modelos metamórficos como los ígneos apoyan un inventario volátil significativo en algunos materiales lunares.
Conclusiones:
- Ciertos materiales lunares poseen un inventario volátil similar al de las rocas terrestres.
- Esto desafía la noción de que la Luna está universalmente agotada en volátiles.
- Algunas partes del manto lunar o de la corteza pueden ser más ricas en volátiles de lo que se suponía anteriormente.
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