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Estructura de la corteza de la provincia de Yunnan, República Popular China, a partir de perfiles de refracción
Resumen
Los datos de refracción sísmica revelan la composición normal de la corteza continental en la provincia de Yunnan, China. Esto sugiere que los procesos sedimentarios, no la acreción oceánica del arco insular, dieron forma a la región.
Área de la Ciencia:
- La geofísica es la geofísica.
- La tectónica es la tectónica.
- Ciencias de la Tierra Ciencias de la Tierra Ciencias de la Tierra
Sus antecedentes:
- La provincia de Yunnan es tectónicamente activa en el extremo sur del arco Himalaya-Birmania.
- Comprender la estructura de la corteza es clave para descifrar la evolución tectónica regional.
Objetivo del estudio:
- Para definir la estructura de la corteza en la provincia de Yunnan utilizando refracción sísmica.
- Para inferir la composición de la corteza terrestre y la historia evolutiva de la región.
Principales métodos:
- El perfil de refracción sísmica se llevó a cabo en la provincia de Yunnan.
- Análisis de las velocidades de las ondas sísmicas para determinar el grosor y la composición de la corteza.
Principales resultados:
- El grosor de la corteza oscila entre 38 y 46 kilómetros.
- La baja velocidad media de la corteza indica una composición de rocas intrusivas meta-sedimentarias y silícicas.
- Se observó una velocidad anormalmente baja del manto superior en un perfil, lo que sugiere una actividad potencial del manto o una anisotropía sísmica.
Conclusiones:
- La composición de la corteza apoya un modelo evolutivo que involucra procesos sedimentarios en el flanco de la plataforma del Yangtsé.
- Los hallazgos desafían las hipótesis anteriores de acreción de arco de islas oceánicas en esta región.
- Los posibles procesos tectónicos activos o la anisotropía sísmica en el manto superior merecen una mayor investigación.
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