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Una edad más joven para ALH84001 y su vínculo geoquímico con fuentes de shergotita en Marte
T J Lapen1, M Righter, A D Brandon
1Department of Earth and Atmospheric Sciences, University of Houston, Houston, TX 77204, USA. tjlapen@uh.edu
Science (New York, N.Y.)
|April 17, 2010
Resumen
El meteorito marciano ALH84001, la roca ígnea más antigua de Marte, tiene 4.091 mil millones de años. Su composición sugiere que el Marte primitivo tenía un océano de magma, que influyó en su geología durante miles de millones de años.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- La geoquímica es la geoquímica.
- Geología de Isótopos Geología de Isótopos.
Sus antecedentes:
- El meteorito marciano ALH84001 (ALH) es la roca ígnea marciana más antigua conocida.
- ALH proporciona información crucial sobre la historia temprana de Marte, incluida su evolución geológica y su campo magnético.
Objetivo del estudio:
- Para determinar la edad ígnea precisa del meteorito marciano ALH84001 utilizando datos del isótopo Lu-Hf.
- Para investigar los primeros procesos magmáticos y las características de la fuente del manto de Marte.
Principales métodos:
- Análisis del isótopo lutecio-hafnio (Lu-Hf) de ALH84001.
- Cálculo de las relaciones Lu/Hf y Sm/Nd para la fuente de magma parental.
Principales resultados:
- ALH84001 tiene una edad ígnea de 4.091 ± 0.030 mil millones de años.
- Los datos indican un extenso procesamiento ígneo en un profundo océano de magma.
- La región de origen del manto es similar a la de los meteoritos shergottite más jóvenes.
Conclusiones:
- Marte experimentó un importante procesamiento ígneo a principios de su historia, que probablemente involucró un océano de magma.
- Los procesos ígneos uniformes pueden haber persistido en Marte durante casi 4 mil millones de años.
- El cese de la dinamo y el campo magnético del núcleo de Marte puede estar relacionado con esta actividad ígnea temprana.
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