TY  - JOUR
A1  - Yang, Wei
A1  - Dupont-Nivet, Guillaume
A1  - Jolivet, Marc
A1  - Guo, Zhaojie
A1  - Bougeois, Laurie
A1  - Bosboom, Roderic
A1  - Zhang, Ziya
A1  - Zhu, Bei
A1  - Heilbronn, Gloria
T1  - Magnetostratigraphic record of the early evolution of the southwestern Tian Shan foreland basin (Ulugqat area), interactions with Pamir indentation and India-Asia collision
JF  - Tectonophysics : international journal of geotectonics and the geology and physics of the interior of the earth
N2  - The Tian Shan range is an inherited intracontinental structure reactivated by the far-field effects of the India-Asia collision. A growing body of thermochronology and magnetostratigraphy datasets shows that the range grew through several tectonic pulses since similar to 25 Ma, however the early Cenozoic history remains poorly constrained. The time-lag between the Eocene India-Asia collision and the Miocene onset of Tian Shan exhumation is particularly enigmatic. This peculiar period is potentially recorded along the southwestern Tian Shan piedmont. There, late Eocene marine deposits of the proto-Paratethys epicontinental sea transition to continental foreland basin sediments of unknown age were recently dated. We provide magnetostratigraphic dating of these continental sediments from the 1700-m-thick Mine section integrated with previously published detrital apatite fission track and U/Pb zircon ages. The most likely correlation to the geomagnetic polarity time scale indicates an age span from 20.8 to 13.3 Ma with a marked increase in accumulation rates at 19-18 Ma. This implies that the entire Oligocene period is missing between the last marine and first continental sediments, as suggested by previous southwestern Tian Shan results. This differs from the southwestern Tarim basin where Eocene marine deposits are continuously overlain by late Eocene-Oligocene continental sediments. This supports a simple evolution model of the western Tarim basin with Eocene-Oligocene foreland basin activation to the south related to northward thrusting of the Kunlun Shan, followed by early Miocene activation of northern foreland basin related to overthrusting of the south Tian Shan. Our data also support southward propagation of the Tian Shan piedmont from 20 to 18 Ma that may relate to motion on the Talas Fergana Fault. The coeval activation of a major right-lateral strike-slip system allowing indentation of the Pamir Salient into the Tarim basin, suggests far-field deformation from the India-Asia collision zone affected the Tian Shan and the Talas Fergana fault by early Miocene. (C) 2015 Elsevier B.V. All rights reserved.
KW  - Magnetostratigraphy
KW  - Cenozoic
KW  - Tian Shan
KW  - Pamir
KW  - Tarim Basin
KW  - Tectonics
Y1  - 2015
U6  - https://doi.org/10.1016/j.tecto.2015.01.003
SN  - 0040-1951
SN  - 1879-3266
VL  - 644
SP  - 122
EP  - 137
PB  - Elsevier
CY  - Amsterdam
ER  -