Land-surface evolution at the continental time-scale: An example from interior Western Australia

Physics

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Scientific paper

The interior plateau of Western Australia in the Wiluna—Meekatharra area is in part an exhumed pre-Permian surface of low relief and to that extent of Gondwana age. A lateritic duricrust on interfluvial remnants of an Old Plateau surface is probably the outcome of several cycles of weathering and stripping, rather than of a single geomorphic episode. Landforms above the Old Plateau have maintained their relief during this circumdenudation and there is no regional evidence of their isolation by major escarpment retreat. A New Plateau surface has extended by stripping of saprolite and is an etchplain, as also is the Old Plateau under the genesis postulated. The New Plateau cycle was initiated by general drainage rejuvenation whilst lateritic weathering still continued, but its extension was halted through increasing climatic aridity, probably during the Miocene.

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