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Extensión y acortamiento simultáneos del mioceno en el orógeno himalayo
Science (New York, N.Y.)
|November 27, 1992
Resumen
El sistema de desprendimiento del sur del Tíbet, crucial para la estructura orogénica del Himalaya, estuvo activo hace 19-22 millones de años. Esto indica que la extensión y convergencia de la corteza fueron procesos tectónicos clave del Mioceno.
Área de la Ciencia:
- Geología Geología Geología.
- La tectónica es la tectónica.
- Geocronología Geocronología.
Sus antecedentes:
- El sistema de desprendimiento del sur del Tíbet (STDS) separa el núcleo metamórfico del orógeno del Himalaya de sus capas superiores.
- Su desarrollo está relacionado con las diferencias de energía potencial gravitacional del engrosamiento de la corteza.
Objetivo del estudio:
- Para investigar el tiempo de actividad del STDS utilizando datos geocronológicos.
- Comprender el papel de la extensión y convergencia de la corteza en la tectónica del Mioceno Himalaya.
Principales métodos:
- Análisis geocronológico de muestras de roca del valle de Rongbuk, en el sur del Tíbet.
- Correlación de la actividad de desprendimiento con eventos de engrosamiento de la corteza.
Principales resultados:
- Los datos geocronológicos indican la actividad del segmento STDS entre hace 19 y 22 millones de años.
- Este período coincidió con un significativo engrosamiento de la corteza en niveles estructurales más profundos.
Conclusiones:
- El STDS estuvo activo durante un intervalo del Mioceno de espesamiento sustancial de la corteza.
- La disociación entre la extensión de la corteza superior y la convergencia de la inferior fue significativa en la tectónica del Himalaya.
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