TY  - JOUR
A1  - Eugster, Patricia
A1  - Thiede, Rasmus Christoph
A1  - Scherler, Dirk
A1  - Stübner, Konstanze
A1  - Sobel, Edward
A1  - Strecker, Manfred
T1  - Segmentation of the Main Himalayan Thrust Revealed by Low-Temperature Thermochronometry in the Western Indian Himalaya
JF  - Tectonics
N2  - Despite remarkable tectonostratigraphic similarities along the Himalayan arc, pronounced topographic and exhumational variability exists in different morphotectonic segments. The processes responsible for this segmentation are debated. Of particular interest is a 30- to 40-km-wide orogen-parallel belt of rapid exhumation that extends from central Nepal to the western Himalaya and its possible linkage to a midcrustal ramp in the basal decollement, and the related growth of Lesser Himalayan duplex structures. Here we present 26 new apatite fission track cooling ages from the Beas-Lahul region, at the transition from the Central to the Western Himalaya (77 degrees-78 degrees E) to investigate segmentation in the Himalayan arc from a thermochronologic perspective. Together with previously published data from this part of the orogen, we document significant lateral changes in exhumation between the Dhauladar Range to the west, the Beas-Lahul region, and the Sutlej area to the east of the study area. In contrast to the Himalayan front farther east, exhumation in the far western sectors is focused at the frontal parts of the mountain range and associated with the hanging wall of the Main Boundary Thrust fault ramp. Our results allow us to spatially correlate the termination of the rapid exhumation belt with a midcrustal ramp to the west. We suggest that a plunging anticline at the northwestern edge of the Larji-Kullu-Rampur window represents the termination of the Central Himalayan segment, which is related to the evolution of the Lesser Himalayan duplex. Key Points
KW  - exhumation
KW  - Himalaya
KW  - duplex
KW  - fission track thermochronology
KW  - MHT
Y1  - 2018
U6  - https://doi.org/10.1029/2017TC004752
SN  - 0278-7407
SN  - 1944-9194
VL  - 37
IS  - 8
SP  - 2710
EP  - 2726
PB  - American Geophysical Union
CY  - Washington
ER  -