Combining surface exposure dating and burial dating from paired cosmogenic depth profiles. Example of El Límite alluvial fan in Huércal-Overa basin (SE Iberia)

• Combined surface exposure and burial dating provides robust minimum and maximum ages.
• It also provides constraints for the exhumation rate and sediment residence time.
• Results suggest that El Límite alluvial fat was deposited in the Late Pleistocene.
• El Límite sediments were reworked due to the activity of the South-AMF.

Cosmogenic nuclide depth-profiles are used to calculate the age of landforms, the rates at which erosion has affected them since their formation and, in case of deposits, the paleo-erosion rate in the source area. However, two difficulties are typically encountered: 1) old deposits or strongly affected by cosmogenic nuclide inheritance often appear to be saturated, and 2) a full propagation of uncertainties often yields poorly constrained ages. Here we show how to combine surface-exposure-dating and burial-dating techniques in the same profile to get more accurate age results and to constrain the extent of pre-depositional burial periods. A 10Be–26Al depth-profile measured in an alluvial fan of SE Iberia is presented as a natural example.