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El meteorito marciano Tissint: una nueva mirada al interior, la superficie y la atmósfera de Marte
H Chennaoui Aoudjehane1, G Avice, J-A Barrat
1Hassan II University Casablanca, Faculty of Sciences, Géosciences Appliquées à l'Ingénierie et l'Aménagement (GAIA) Laboratory, BP 5366 Maârif, Casablanca, Morocco. chennaoui_h@yahoo.fr
Science (New York, N.Y.)
|October 16, 2012
Resumen
El meteorito de Tissint, una shergotita picrítica agotada, muestra claros signos de desgaste marciano, distinguiéndolo de la contaminación de la Tierra. Su composición y edad de exposición lo vinculan con otros meteoritos marcianos como EETA79001.1.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- La geoquímica es la geoquímica.
- La mineralogía es la Mineralogía.
Sus antecedentes:
- Tissint es el quinto meteorito marciano de caída atestiguado.
- Las shergottitas son una clase importante de meteoritos marcianos.
Objetivo del estudio:
- Para llevar a cabo un estudio integrado de mineralogía, petrología y geoquímica del meteorito de Tissint.
- Para distinguir in situ el clima marciano de la contaminación terrestre.
- Para comparar las características meteorológicas marcianas con las observaciones de naves espaciales.
Principales métodos:
- El análisis mineralógico.
- Análisis petrológico Análisis petrológico
- Análisis geoquímico (incluyendo oligoelementos refractarios, azufre y flúor)
Principales resultados:
- Tissint es una shergotita picrítica empobrecida, similar a la EETA79001A.
- Están presentes vidrios abundantes que contienen atmósfera marciana y olivina altamente magnesiana.
- Componente de la superficie marciana identificado a través de datos de oligoelementos, azufre y flúor.
- Las características meteorológicas marcianas son distintas de la contaminación terrestre.
- La edad de exposición a los rayos cósmicos es de 0,7 ± 0,3 millones de años.
Conclusiones:
- El clima marciano in situ se puede identificar inequívocamente en Tissint.
- Las características meteorológicas marcianas en Tissint se alinean con las observaciones de la nave espacial de Marte.
- Tissint y otras shergottites como EETA79001 pueden haber sido expulsados de Marte en el mismo evento.
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