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La cúpula de Kangmar: un complejo de núcleo metamórfico en el sur de Xizang (Tíbet)
Science (New York, N.Y.)
|December 14, 1990
Resumen
La cúpula de Kangmar en el Tíbet se formó a través de la deformación extensional, similar a los complejos de núcleos metamórficos de América del Norte. Esto sugiere que la extensión juega un papel clave en la evolución del cinturón montañoso, incluso en entornos convergentes.
Área de la Ciencia:
- Geología Geología Geología.
- La tectónica es la tectónica.
- Geología Estructural Geología estructural.
Sus antecedentes:
- El cinturón del norte del Himalaya contiene enigmáticas cúpulas de gneiss.
- El complejo de Kangmar es un ejemplo accesible de estas cúpulas de Gneiss.
- Estas cúpulas se encuentran entre el Gran Himalaya y la sutura Indus-Tsangpo en el sur del Tíbet.
Objetivo del estudio:
- Para analizar la formación estructural de la cúpula Kangmar.
- Para comparar la formación de la cúpula de Kangmar con otros complejos de núcleos metamórficos a nivel mundial.
- Comprender el papel de la deformación extensional en los cinturones de montaña convergentes.
Principales métodos:
- Análisis estructural del complejo metamórfico-igneo de Kangmar.
- Análisis comparativo con complejos de núcleos metamórficos terciarios en la Cordillera norteamericana.
Principales resultados:
- La estructura de la cúpula de Kangmar es el resultado de una deformación extensional.
- A diferencia de sus homólogos norteamericanos, la cúpula de Kangmar se formó en un entorno tectónico convergente.
- Se han documentado complejos de núcleos metamórficos dentro del orógeno del Himalaya.
Conclusiones:
- Los procesos extensivos son significativos en la evolución de los cinturones de montaña por compresión.
- La cúpula de Kangmar proporciona evidencia de extensión dentro del orógeno del Himalaya.
- La formación de la cúpula de Gneiss puede ocurrir en diversos entornos tectónicos.
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