TY  - JOUR
A1  - Dey, Saptarshi
A1  - Thiede, Rasmus Christoph
A1  - Schildgen, Taylor F.
A1  - Wittmann, Hella
A1  - Bookhagen, Bodo
A1  - Scherler, Dirk
A1  - Strecker, Manfred
T1  - Holocene internal shortening within the northwest Sub-Himalaya: Out-of-sequence faulting of the Jwalamukhi Thrust, India
JF  - Tectonics
N2  - The southernmost thrust of the Himalayan orogenic wedge that separates the foreland from the orogen, the Main Frontal Thrust, is thought to accommodate most of the ongoing crustal shortening in the Sub-Himalaya. Steepened longitudinal river profile segments, terrace offsets, and back-tilted fluvial terraces within the Kangra reentrant of the NW Sub-Himalaya suggest Holocene activity of the Jwalamukhi Thrust (JMT) and other thrust faults that may be associated with strain partitioning along the toe of the Himalayan wedge. To assess the shortening accommodated by the JMT, we combine morphometric terrain analyses with in situ Be-10-based surface-exposure dating of the deformed terraces. Incision into upper Pleistocene sediments within the Kangra Basin created two late Pleistocene terrace levels (T1 and T2). Subsequent early Holocene aggradation shortly before similar to 10ka was followed by episodic reincision, which created four cut-and-fill terrace levels, the oldest of which (T3) was formed at 10.10.9ka. A vertical offset of 445m of terrace T3 across the JMT indicates a shortening rate of 5.60.8 to 7.51.1mma(-1) over the last similar to 10ka. This result suggests that thrusting along the JMT accommodates 40-60% of the total Sub-Himalayan shortening in the Kangra reentrant over the Holocene. We speculate that this out-of-sequence shortening may have been triggered or at least enhanced by late Pleistocene and Holocene erosion of sediments from the Kangra Basin.
KW  - fluvial terrace
KW  - cosmogenic nuclides
KW  - steepness index
KW  - Jwalamukhi Thrust
KW  - shortening
KW  - orogenic wedge
Y1  - 2016
U6  - https://doi.org/10.1002/2015TC004002
SN  - 0278-7407
SN  - 1944-9194
VL  - 35
SP  - 2677
EP  - 2697
PB  - American Geophysical Union
CY  - Washington
ER  -