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¿El brote de laurentia convirtió Gondwanalandia de adentro hacia afuera?
Science (New York, N.Y.)
|June 7, 1991
Resumen
Las comparaciones geológicas del Proterozoico tardío revelan Laurentia.
Área de la Ciencia:
- Geodinámica y tectónica de placas.
- Paleogeografía y evolución de los supercontinentes.
- Geología Estructural y Tectónica.
Sus antecedentes:
- Los vecinos del Proterozoico tardío de Laurentia incluían Siberia, Australia y la Antártida, el sur de África y Amazonia y el Báltico.
- La fragmentación del supercontinente centrada en Laurentia precedió a la deriva continental y al reensamblaje.
Objetivo del estudio:
- Para reconstruir la configuración paleogeográfica de Laurentia durante el Proterozoico Tardío.
- Para explicar la evolución tectónica y la fragmentación de un supercontinente centrado en Laurentia.
- Para correlacionar los estilos tectónicos con las reconstrucciones paleogeográficas propuestas.
Principales métodos:
- Análisis geológico comparativo de los márgenes continentales.
- Reconstrucción de configuraciones paleogeográficas basadas en pruebas geológicas.
- Análisis de los regímenes tectónicos (clave frente a la subducción-acreción) en relación con los polos de rotación propuestos.
Principales resultados:
- Continentes adyacentes identificados a Laurentia en el Proterozoico Tardío: Siberia, Australia y la Antártida, el sur de África y Amazonia y el Báltico.
- Propuso un modelo de fragmentación de supercontinentes y el posterior colapso de los continentes del sur.
- Vinculó un polo de rotación del mar de Weddell a la tectónica de la llave inglesa observada en los cinturones de tendencia este-oeste y la subducción-acreción en los cinturones de tendencia norte-sur.
- Demostró que las grietas interiores se convirtieron en márgenes externos de Gondwanalandia, mientras que los márgenes exteriores se convirtieron en sin litoral.
Conclusiones:
- El modelo de fragmentación y reensamblaje propuesto proporciona un marco para comprender los eventos tectónicos del Proterozoico Tardío al Paleozoico.
- El polo de rotación del mar de Weddell explica efectivamente los diferentes estilos tectónicos observados en los cinturones móviles panafricanos.
- La evolución de los márgenes continentales durante los ciclos de supercontinentes implica cambios significativos en el entorno tectónico y la posición geográfica.
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