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Aceleración de la convergencia India-Eurasia mediante subducción de sedimentos de margen pasivo
Hao Zhou1, Jiashun Hu2,3, Luca Dal Zilio4,5
1Department of Earth and Space Sciences, Southern University of Science and Technology, Shenzhen, China.
Nature
|November 7, 2024
Resumen
La rápida convergencia India-Eurasia se aceleró hace unos 65 millones de años debido a la subducción de sedimentos del margen pasivo indio. Este evento geológico limitó la colisión inicial a hace aproximadamente 60 millones de años.
Área de la Ciencia:
- Geología
- La geofísica
- Geoquímica
Sus antecedentes:
- La convergencia acelerada entre las placas indias y euroasiáticas hace unos 65 millones de años (Ma) es un evento geológico complejo.
- Las explicaciones anteriores enfrentaron incertidumbre con respecto a la historia tectónica y las fuerzas que influyen en la velocidad de las placas.
Objetivo del estudio:
- Para explicar el rápido aumento en la tasa de convergencia India-Eurasia alrededor de 65 Ma.
- Para investigar el papel de la subducción de sedimentos en esta aceleración.
Principales métodos:
- Análisis geoquímico (isótopos y oligoelementos) de las rocas magmáticas del Ganges.
- Modelado geodinámico para simular efectos de subducción de sedimentos.
- Análisis de la contribución del sedimento fundido a las fuentes del manto.
Principales resultados:
- Se observó una mayor contribución del derretimiento de sedimentos terrígenos a la fuente del manto de las rocas magmáticas de Ganges alrededor de 65 Ma.
- Los experimentos numéricos indicaron que la subducción de sedimentos gruesos (más de 1 km) podría estimular una mayor convergencia y extensión de la corteza.
- La aceleración de la convergencia se correlaciona con la llegada de sedimentos derivados del margen pasivo.
Conclusiones:
- La rápida aceleración de la convergencia India-Eurasia se explica por la subducción de sedimentos del margen pasivo del norte de la India.
- La colisión inicial entre la India y Eurasia se limita a aproximadamente 60 millones de años.
- Las aceleraciones temporales en las tasas de subducción pueden ser comunes durante las etapas finales del ensamblaje continental.
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