TY  - JOUR
A1  - Macaulay, Euan A.
A1  - Sobel, Edward
A1  - Mikolaichuk, Alexander
A1  - Landgraf, Angela
A1  - Kohn, Barry
A1  - Stuart, Finlay
T1  - Thermochronologic insight into late Cenozoic deformation in the basement-cored Terskey Range, Kyrgyz Tien Shan
T2  - Tectonics
N2  - Basement-cored ranges formed by reverse faulting within intracontinental mountain belts are often composed of poly-deformed lithologies. Geological data capable of constraining the timing, magnitude, and distribution of the most recent deformational phase are usually missing in such ranges. In this paper, we present new low temperature thermochronological and geological data from a transect through the basement-cored Terskey Range, located in the Kyrgyz Tien Shan. Using these data, we are able to investigate the range's late Cenozoic deformation for the first time. Displacements on reactivated faults are constrained and deformation of thermochronologically derived structural markers is assessed. These structural markers postdate the earlier deformational phases, providing the only record of Cenozoic deformation and of the reactivation of structures within the Terskey Range. Overall, these structural markers have a southern inclination, interpreted to reflect the decreasing inclination of the reverse fault bounding the Terskey Range. Our thermochronological data are also used to investigate spatial and temporal variations in the exhumation of the Terskey Range, identifying a three-stage Cenozoic exhumation history: (1) virtually no exhumation in the Paleogene, (2) increase to slightly higher exhumation rates at similar to 26-20Ma, and (3) significant increase in exhumation starting at similar to 10Ma.
KW  - Thermochronology
KW  - Basement-cored ranges
KW  - Tien Shan
KW  - Structural geology
Y1  - 2013
UR  - https://publishup.uni-potsdam.de/frontdoor/index/index/docId/34958
SN  - 0278-7407
VL  - 32
IS  - 3
SP  - 487
EP  - 500
PB  - American Geophysical Union
CY  - Washington
ER  -