Variability of magmatic and cosmogenic 3He in Ethiopian river sands of detrital pyroxenes: Impact on denudation rate determinations

Using the measured cosmogenic 3He, we calculate basin-averaged denudation rates of 70 ± 20 and 57 ± 5 mm kyr− 1, for the Mile and for the Tekeze river, respectively. These values are coherent with long-term denudation rates previously proposed from low-temperature thermochronology.