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Fusión por rayos: extrema reducción y inmiscibilidad líquida metal-silicato
Science (New York, N.Y.)
|October 10, 1986
Resumen
Los rayos pueden crear materiales altamente reducidos, incluidos los glóbulos de silicio nativos, al alcanzar temperaturas extremas de más de 2000 K. Estos hallazgos arrojan luz sobre procesos geológicos y anomalías geoquímicas.
Área de la Ciencia:
- La geoquímica es la geoquímica.
- La mineralogía es la Mineralogía.
- Ciencias planetarias Ciencias planetarias.
Sus antecedentes:
- Las fulguritas son materiales vidriosos formados por rayos.
- La reciente fulgurita de Michigan contiene inusuales glóbulos metálicos ricos en silicio nativo.
Objetivo del estudio:
- Investiga los inusuales glóbulos metálicos encontrados en una fulgurita de Michigan.
- Elucidar las condiciones de la formación de fulgurita y los eventos de reducción extrema.
Principales métodos:
- Cálculos termodinámicos para determinar las temperaturas y condiciones de formación.
- Análisis de las fases líquidas metálicas y silicatadas.
Principales resultados:
- La formación requirió temperaturas superiores a 2000 K y condiciones altamente reductoras (buffer SiO2Si).
- Produjo materiales naturales altamente reducidos, incluidos glóbulos de silicio nativos.
- Los líquidos metálicos limpiaron los elementos del grupo del platino.
Conclusiones:
- Los rayos pueden causar una reducción y volatilización extremas.
- Estos procesos pueden explicar algunas anomalías geoquímicas, como las del límite Cretácico-Terciario.
- El rayo terrestre podría contribuir a las anomalías relacionadas con el impacto extraterrestre.
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