@article{fdi:010066719, title = {{C}ontrasting tectonically driven exhumation and incision patterns, western versus central {N}epal {H}imalaya}, author = {van der {B}eek, {P}. and {L}itty, {C}. and {B}audin, {M}. and {M}ercier, {J}. and {R}obert, {X}avier and {H}ardwick, {E}.}, editor = {}, language = {{ENG}}, abstract = {{A}lthough the {H}imalayan range is classically presented as cylindrical along strike, segmentation of the range in terms of structure, topography, precipitation, and erosion patterns is becoming widely recognized. {T}he potential climatic or tectonic controls on these lateral variations remain controversial. {T}hermokinematic models predict that the geometry of the main {H}imalayan detachment controls the kinematics, exhumation, and topography of the orogen: where the detachment includes a major crustal ramp, the topography shows a steep gradient that focuses orographic precipitation and exhumation, whereas the topography is gentler and exhumation less focused above a flatter detachment. {W}e test this prediction by comparing the patterns of river incision (specific stream power) and long-term exhumation (from apatite fission track thermochronology) in central {N}epal, where a major crustal ramp has been imaged by geophysical methods, with new exploratory data from the remote {K}arnali {R}iver transect in western {N}epal, where a ramp is predicted to be absent or minor. {O}ur results show that both exhumation rates and river incision capacity are significantly higher and focused on the crustal ramp in central {N}epal, whereas they are lower and the pattern is more diffuse in western {N}epal. {T}hese differences support a model in which lateral variations in topography and exhumation are controlled by variations in the geometry of the detachment, and imply that along-strike climatic variations in the {H}imalaya respond to tectonics rather than driving it.}, keywords = {{NEPAL} ; {HIMALAYA}}, booktitle = {}, journal = {{G}eology}, volume = {44}, numero = {4}, pages = {327--330}, ISSN = {0091-7613}, year = {2016}, DOI = {10.1130/g37579.1}, URL = {https://www.documentation.ird.fr/hor/fdi:010066719}, }