Contrasted morphologies of the Western and Eastern Piedmonts of the Mt Lofty Ranges, South Australia

Resumen

La cadena montañosa del Monte Lofty es un horst que se originó en dos etapas. Su margen oeste se desarrolló como parte del “Shatter Belt” de Australiadel Sur durante la separación de Australia y la Antártida. El golfo de San Vicente se originó en esa época. Aunque recurrentes en el tiempo, los levantamientos tectónicos se inician esencialmente al inicio del Eoceno y con el mayor ascenso al final del Cenozoico. Por el contrario, el margen fallado del este es al final el Mioceno Medio. Por otra parte, mientras el piedemonte y las zonas levantadas del oeste se vieron afectadas por los cambios del nivel del mar durante el Cenozoico tardío, y lo que ello implicó en el comportamiento de los ríos, el sector este fue protegido de esos cambios por la gran masa de calizas del Mioceno que rellenan la cuenca Murray, inmediatamente al este. Por tanto, el piedemonte oeste está dominado por abanicos aluviales mientras que el del este es complejo, con depresiones de pie de escarpe bien desarrolladas, formas exhumadas y campos de dunas en algunos sectores.
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Biografía del autor/a

Charles Rowland Twidale

,
University of Adelaide
School of Earth and Environmental Sciences. Geology and Geophysics. University of Adelaide, G. P. O. Box 498, Adelaide, South Australia 5005, Australia.
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