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Las terrazas de los ríos del Cámbrico y las crestas en el centro de Australia: ¿las formas de relieve más antiguas y
Science (New York, N.Y.)
|August 15, 1986
Resumen
Los sedimentos fluviales en los antiguos paleovalles australianos revelan restos de terrazas que datan del período cámbrico. Estas formas de relieve proporcionan información sobre la historia geológica de la provincia de Davenport y sus antiguas superficies.
Área de la Ciencia:
- Geología Geología Geología.
- Paleontología Paleontología.
- La sedimentología sedimentológica.
Sus antecedentes:
- La provincia de Davenport en el centro de Australia presenta la superficie de Ashburton, una formación geológica significativa.
- Las paleovalleys incrustadas en esta superficie contienen sedimentos fluviales que forman restos de terrazas.
Objetivo del estudio:
- Para determinar la edad y el origen de los sedimentos fluviales y las formas de relieve asociadas en la provincia de Davenport.
- Para entender la evolución geológica de la superficie de Ashburton y las paleovalleys.
Principales métodos:
- Análisis sedimentológico de depósitos fluviales.
- Correlación estratigráfica de los remanentes de las terrazas con las capas que contienen fósiles marinos.
- Cartografía geológica de la superficie de Ashburton y de los paleovalles.
Principales resultados:
- Los restos de terrazas en los paleovalles conservan las cimas de deposición originales y probablemente han estado subaéreas desde su formación.
- Los fósiles marinos encontrados en sedimentos conformes con depósitos fluviales indican una edad cámbrica para las terrazas.
- La superficie de Ashburton está fechada en el Cámbrico o antes.
Conclusiones:
- Las terrazas fluviales representan un evento de deposición del Cámbrico dentro de paleovalles cortados en la superficie de Ashburton más antigua.
- Los hallazgos establecen una edad mínima para la superficie de Ashburton y proporcionan una línea de tiempo para la evolución del paisaje en la región.
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