Fleming, Alastair; Summerfield, Michael; Stone, John O; Fifield, L Keith; Cresswell, Richard
Cosmogenic 36Cl concentrations in basalt samples from the Drakensberg escarpment on the SE African passive margin give quantitative estimates of denudation and scarp retreat rates. Over the 104-106 year timespan addressed by these data, the calculated escarpment retreat rate has been 50-95 m Ma-1 and the average summit denudation rate 6 m Ma-1. The scarp retreat rate is an order of magnitude less than previously suggested. The rate of summit lowering is sufficient to prevent the long-term...[Show more]
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