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Tectónica de placas hace 2.500 millones de años: evidencia en kolar, en el sur de la India
Science (New York, N.Y.)
|March 10, 1989
Resumen
El Cinturón de Esquistos Kolar Arcaico en la India revela distintos terrenos geológicos. La evidencia sugiere que la tectónica de placas estaba activa en la Tierra ya hace 2.500 millones de años.
Área de la Ciencia:
- Geología Geología Geología.
- La tectónica es la tectónica.
- Ciencias de la Tierra Ciencias de la Tierra Ciencias de la Tierra
Sus antecedentes:
- El Cinturón de Esquistos Kolar Arcaico en el sur de la India es una zona de sutura compleja.
- Cuenta con múltiples gneiss y terranes anfibolitos con historias geológicas únicas.
Objetivo del estudio:
- Para investigar la historia de la acumulación del cinturón de esquisto de Kolar.
- Determinar el momento de la yuxtaposición de terrane y sus implicaciones para la tectónica de la Tierra temprana.
Principales métodos:
- Análisis de los elementos incompatibles y las características isotópicas de los anfibolitos.
- Cartografía geológica y análisis estructural del cinturón de esquisto de Kolar.
Principales resultados:
- Los anfibolitos de diferentes lados del cinturón muestran firmas geoquímicas distintas, lo que indica diversas fuentes de manto.
- La yuxtaposición de los terrenos se produjo entre hace 2530 y 2420 millones de años debido a la compresión y el corte.
Conclusiones:
- La historia de acreción del cinturón de esquisto de Kolar es comparable a los márgenes convergentes modernos.
- Esto sugiere que la tectónica de placas estaba operativa en la Tierra hace 2.500 millones de años.
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