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La evolución geológica de la meseta tibetana
Leigh H Royden1, B Clark Burchfiel, Robert D van der Hilst
1Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 01890, USA. lhroyden@mit.edu
Science (New York, N.Y.)
|August 23, 2008
Resumen
La meseta tibetana es la meseta tibetana.
Área de la Ciencia:
- Geología Geología Geología.
- La tectónica es la tectónica.
- La tectónica de placas es la tectónica de placas.
Sus antecedentes:
- La colisión India-Eurasia inició la formación de la meseta tibetana hace aproximadamente 50 millones de años.
- El acortamiento de la corteza se produjo en el Tíbet occidental y central, con fragmentos litosféricos extrudidos hacia el Pacífico occidental e Indonesia.
- La migración de las trincheras del Pacífico se desaceleró hace 15-20 millones de años, lo que afectó a la extrusión de fragmentos.
Objetivo del estudio:
- Proporcionar un contexto geológico más amplio para la evolución de la meseta tibetana más allá de la colisión India-Eurasia.
- Investigar la relación entre los eventos tectónicos y el desarrollo estructural de la meseta.
- Comprender los mecanismos que impulsan la elevación de la superficie y el engrosamiento de la corteza en el este del Tíbet.
Principales métodos:
- Análisis de la evolución geológica y los procesos tectónicos.
- Interpretación del acortamiento de la corteza y la extrusión de fragmentos de la litosfera.
- Correlación de la migración de las trincheras del Pacífico con la deformación de la meseta.
Principales resultados:
- El acortamiento de la corteza y la extrusión de la litosfera ocurrieron después de la colisión.
- El cese de la rápida migración de la zanja del Pacífico coincidió con una extrusión más lenta.
- El rápido levantamiento de la superficie y el engrosamiento de la corteza en el este del Tíbet resultaron del flujo profundo de la corteza hacia el este.
Conclusiones:
- La evolución de la meseta tibetana está vinculada a eventos tectónicos más amplios más allá de la colisión India-Eurasia.
- El flujo profundo de la corteza terrestre dentro de los canales sísmicos probablemente impulsa la elevación y el engrosamiento del Tíbet oriental.
- Estos procesos marcan una transición al sistema estructural moderno que acomoda la deformación en el Tíbet.
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