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Continúa la elevación de la meseta de Colorado por el descenso litosférico convectivo de estilo de delaminación
A Levander1, B Schmandt, M S Miller
1Earth Science Department, Rice University, Houston, Texas 77005-1892, USA. alan@rice.edu
Nature
|April 29, 2011
Resumen
La meseta de Colorado es la meseta de Colorado.
Área de la Ciencia:
- La geofísica es la geofísica.
- La tectónica es la tectónica.
- La geodinámica es la geodinámica.
Sus antecedentes:
- La meseta de Colorado, una región de gran altitud en América del Norte, carece de una deformación significativa, por lo que su mecanismo de elevación no está claro.
- Las provincias circundantes experimentaron deformación por compresión y extensión, a diferencia de la meseta internamente estable.
- Las teorías anteriores sugirieron el equilibrio isostático, pero no pudieron explicar la elevada elevación sostenida de la meseta.
Objetivo del estudio:
- Para investigar la estructura litosférica profunda debajo de la meseta de Colorado.
- Comprender los procesos geodinámicos responsables de la elevación de la meseta y su gran elevación.
- Para vincular las características geológicas de la superficie, como la incisión del Gran Cañón, a los procesos profundos de la Tierra.
Principales métodos:
- Tomografía sísmica y análisis de la función del receptor para obtener imágenes de estructuras subterráneas.
- Integración de datos petrológicos y geoquímicos.
- Análisis del vulcanismo basáltico del Plioceno y las tasas de incisión del Gran Cañón.
Principales resultados:
- Identificación de una anomalía profunda y de alta velocidad debajo de la meseta de Colorado centro-oeste que se extiende a más de 200 km de profundidad.
- Las imágenes sísmicas revelan una interfaz de inmersión desde la corteza inferior a una profundidad de 70-90 km, con un Moho elevado.
- Interpretación de estas características como evidencia de la delaminación en curso de la corteza inferior y la litosfera.
Conclusiones:
- El levantamiento de la meseta de Colorado y el magmatismo asociado son impulsados por fundimientos litosféricos profundos.
- Los eventos de subducción pasados hidrataron y debilitaron el manto tectosférico del Proterozoico.
- La infiltración magmática en el Cenozoico desencadenó el descenso y la remoción litosférica, elevando progresivamente la meseta durante millones de años.
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