TY  - THES
A1  - Emberson, Robert
T1  - Chemical weathering driven by bedrock landslides
Y1  - 2016
ER  - 
TY  - JOUR
A1  - Emberson, Robert
A1  - Hovius, Niels
A1  - Galy, Albert
A1  - Marc, Odin
T1  - Oxidation of sulfides and rapid weathering in recent landslides
JF  - Earth surface dynamics
N2  - Bedrock landslides, by excavating deep below saprolite-rock interfaces, create conditions for weathering in which all mineral phases in a lithology are initially unweathered within landslide deposits. As a result, the most labile phases dominate the weathering immediately after mobilisation and during a transient period of depletion. This mode of dissolution can strongly alter the overall output of solutes from catchments and their contribution to global chemical cycles if landslide-derived material is retained in catchments for extended periods after mass wasting.
Y1  - 2016
U6  - https://doi.org/10.5194/esurf-4-727-2016
SN  - 2196-6311
SN  - 2196-632X
VL  - 4
SP  - 727
EP  - 742
PB  - Copernicus
CY  - Göttingen
ER  - 
TY  - JOUR
A1  - Emberson, Robert
A1  - Hovius, Niels
A1  - Galy, Albert
A1  - Marc, Odin
T1  - Chemical weathering in active mountain belts controlled by stochastic bedrock landsliding
JF  - Nature geoscience
N2  - A link between chemical weathering and physical erosion exists at the catchment scale over a wide range of erosion rates(1,2). However, in mountain environments, where erosion rates are highest, weathering may be kinetically limited(3-5) and therefore decoupled from erosion. In active mountain belts, erosion is driven by bedrock landsliding(6) at rates that depend strongly on the occurrence of extreme rainfall or seismicity(7). Although landslides affect only a small proportion of the landscape, bedrock landsliding can promote the collection and slow percolation of surface runoff in highly fragmented rock debris and create favourable conditions for weathering. Here we show from analysis of surface water chemistry in the Southern Alps of New Zealand that weathering in bedrock landslides controls the variability in solute load of these mountain rivers. We find that systematic patterns in surface water chemistry are strongly associated with landslide occurrence at scales from a single hillslope to an entire mountain belt, and that landslides boost weathering rates and river solute loads over decades. We conclude that landslides couple erosion and weathering in fast-eroding uplands and, thus, mountain weathering is a stochastic process that is sensitive to climatic and tectonic controls on mass wasting processes.
Y1  - 2016
U6  - https://doi.org/10.1038/NGEO2600
SN  - 1752-0894
SN  - 1752-0908
VL  - 9
SP  - 42
EP  - +
PB  - Nature Publ. Group
CY  - New York
ER  -