TY  - JOUR
A1  - Roda-Boluda, Duna C.
A1  - Whittaker, Alexander C.
A1  - Gheorghiu, Delia M.
A1  - Rodes, Angel
A1  - D'Arcy, Mitch
T1  - Be-10 erosion rates controlled by transient response to normal faulting through incision and landsliding
JF  - Earth & planetary science letters
N2  - Quantifying erosion rates, and how they compare to rock uplift rates, is fundamental for understanding landscape response to tectonics and associated sediment fluxes from upland areas. The erosional response to uplift is well-represented by river incision and the associated landslide activity. However, characterising the relationship between these processes remains a major challenge in tectonically active areas, in some cases because landslides can preclude obtaining reliable erosion rates from cosmogenic radionuclide (CRN) concentrations. Here, we quantify the control of tectonics and its coupled geomorphic response on the erosion rates of catchments in southern Italy that are experiencing a transient response to normal faulting. We analyse in-situ Be-10 concentrations for detrital sediment samples, collected along the strike of faults with excellent tectonic constraints and landslide inventories. We demonstrate that Be-10-derived erosion rates are controlled by fault throw rates and the extent of transient incision and associated landsliding in the catchments. We show that the low-relief sub-catchments above knickpoints erode at uniform background rates of similar to 0.10 mm/yr, while downstream of knickpoints, erosion removes similar to 50% of the rock uplifted by the faults, at rates of 0.10-0.64 mm/yr. Despite widespread landsliding, CRN samples provide relatively consistent and accurate erosion rates, most likely because landslides are frequent, small, and shallow, and represent the integrated record of landsliding over several seismic cycles. Consequently, we combine these validated Be-10 erosion rates and data from a geomorphological landslide inventory in a published numerical model, to gain further insight into the long-term landslide rates and sediment mixing, highlighting the potential of CRN data to study landslide dynamics. (C) 2018 Elsevier B.V. All rights reserved.
KW  - cosmogenic nuclides
KW  - erosion rates
KW  - normal faults
KW  - incision
KW  - landslides
KW  - transient response
Y1  - 2019
U6  - https://doi.org/10.1016/j.epsl.2018.11.032
SN  - 0012-821X
SN  - 1385-013X
VL  - 507
SP  - 140
EP  - 153
PB  - Elsevier
CY  - Amsterdam
ER  -