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El rápido cambio en la deriva de la placa australiana registra una colisión con la meseta de Ontong Java
Kurt M Knesel1, Benjamin E Cohen, Paulo M Vasconcelos
1Earth Sciences, The University of Queensland, St Lucia, Queensland, 4072, Australia. k.knesel@uq.edu.au
Nature
|August 8, 2008
Resumen
La meseta de Java Ontong es una meseta de Java.
Área de la Ciencia:
- La geofísica es la geofísica.
- La tectónica de placas es la tectónica de placas.
- Geocronología Geocronología.
Sus antecedentes:
- Las mesetas oceánicas, como la meseta Ontong Java, influyen en los modelos de movimiento de las placas.
- Comprender su historia de subducción es clave para la reorganización de las placas.
- Estudios previos carecían de una sincronización precisa para la colisión de trincheras melanesias de la meseta de Ontong Java.
Objetivo del estudio:
- Para descifrar la historia de colisión entre la meseta de Ontong Java y la placa australiana.
- Para evaluar el impacto de la subducción de la meseta oceánica en el movimiento de las placas.
- Para restringir el momento de la llegada de la meseta de Ontong Java a la zanja melaneciana.
Principales métodos:
- (40) Ar-(39) Ar datación geocronológica de los volcanes de puntos calientes en el este de Australia.
- Análisis de los desplazamientos de las vías de la cadena de montaña submarina en el mar de Tasmania.
- Correlación de datos geocronológicos con modelos de movimiento de placas.
Principales resultados:
- Nuevos datos geocronológicos revelan un vínculo entre la colisión de la meseta de Ontong Java y el movimiento de la placa australiana.
- Se identificó un corto período de reducción del movimiento de las placas hacia el norte (hace 26-23 millones de años).
- Evidencia de una desviación hacia el oeste de la placa australiana durante la entrada de la meseta en la zanja melaneciana.
Conclusiones:
- La colisión de la meseta de Ontong Java con el arco melanesio causó una breve desviación hacia el oeste de la placa australiana.
- Este evento, ocurrido hace 26 millones de años, inició una subducción en dirección suroeste a lo largo del canal de Trobriand.
- Inmensas mesetas oceánicas pueden desencadenar cambios significativos a escala global en los límites de las placas y el movimiento.
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