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La geofísica. Deformación por capas en el orógeno de Taiwan
1Department of Geosciences, National Taiwan University, Taipei, Taiwan.
Resumen
La formación de montañas implica movimientos complejos de la corteza. Japón
Área de la Ciencia:
- Geofísica, tectónica y geología estructural
Sus antecedentes:
- El empuje de la corteza continental durante la formación de montañas en los márgenes convergentes es un tema de debate.
- Comprender los mecanismos de deformación dentro de los orógenos es crucial para la investigación de la tectónica de placas.
Objetivo del estudio:
- Para investigar la estructura sísmica tridimensional anisotrópica de Taiwán.
- Para aclarar los procesos de deformación y las capas de la corteza en una zona de colisión continental importante.
Principales métodos:
- Empleado tomografía anisotrópica sísmica tridimensional.
- Se analizó la propagación de ondas sísmicas para inferir la orientación y la deformación del tejido subterráneo.
Principales resultados:
- Se observó un patrón de deformación de dos capas en la corteza de Taiwán.
- La corteza superior exhibe deformación por compresión relacionada con la colisión.
- La corteza inferior muestra una deformación de corte paralela a la convergencia, atribuida a la placa euroasiática subducente.
Conclusiones:
- El orógeno de Taiwán muestra un claro modelo de deformación de dos capas.
- La subducción juega un papel crítico en la formación del cinturón montañoso de Taiwán, impulsado por el hundimiento de la litosfera del manto.
- La anisotropía sísmica revela la compleja interacción entre los procesos de colisión y subducción.
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