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La apatita 4He/3He y (U-Th) /He son pruebas de un antiguo Gran Cañón
1Department of Geological Sciences, University of Colorado at Boulder, Boulder, CO 80309, USA. rebecca.flowers@colorado.edu
Science (New York, N.Y.)
|December 1, 2012
Resumen
El Gran Cañón es el Gran Cañón.
Área de la Ciencia:
- Geología y Geocronología.
- Tectónica y Geomorfología.
Sus antecedentes:
- La edad y la formación del Gran Cañón siguen siendo un tema de debate científico.
- Más de 150 años de investigación han dado lugar a varias hipótesis con respecto a su tallado.
Objetivo del estudio:
- Para fechar con precisión la incisión del Gran Cañón utilizando la termocronometría de apatita (4) He / (3) He.
- Para resolver las controversias que rodean el momento de la formación del cañón.
Principales métodos:
- Análisis de datos de termocronometría de apatita (4) He/(3) He de las rocas del sótano del Gran Cañón.
- Utilizando modelos cinéticos de difusión de helio para interpretar las historias de enfriamiento.
Principales resultados:
- Se obtuvieron historias de enfriamiento consistentes para apatitas del este del Gran Cañón.
- Los datos sugieren que el oeste del Gran Cañón fue excavado a profundidades casi modernas hace aproximadamente 70 millones de años.
Conclusiones:
- El estudio desafía el modelo convencional de la formación del Gran Cañón, lo que sugiere que la talla significativa se produjo mucho antes.
- Los datos termocronométricos proporcionan fuertes restricciones en el historial de enfriamiento e incisión a largo plazo del cañón.
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