TY  - JOUR
A1  - Mueller, Megan A.
A1  - Licht, Alexis
A1  - Campbell, C.
A1  - Ocakoglu, F.
A1  - Taylor, Marc Hollis
A1  - Burch, L.
A1  - Ugrai, Tamas
A1  - Kaya, M.
A1  - Kurtoglu, B.
A1  - Coster, P. M. C.
A1  - Metais, Mustafa Yücel
A1  - Beard, Kenneth Christopher
T1  - Collision Chronology Along the Izmir-Ankara-Erzincan Suture Zone: Insights From the Saricakaya Basin, Western Anatolia
JF  - Tectonics
N2  - Debate persists concerning the timing and geodynamics of intercontinental collision, style of syncollisional deformation, and development of topography and fold-and-thrust belts along the >1,700-km-long Izmir-Ankara-Erzincan suture zone (IAESZ) in Turkey. Resolving this debate is a necessary precursor to evaluating the integrity of convergent margin models and kinematic, topographic, and biogeographic reconstructions of the Mediterranean domain. Geodynamic models argue either for a synchronous or diachronous collision during either the Late Cretaceous and/or Eocene, followed by Eocene slab breakoff and postcollisional magmatism. We investigate the collision chronology in western Anatolia as recorded in the sedimentary archives of the 90-km-long Saricakaya Basin perched at shallow structural levels along the IAESZ. Based on new zircon U-Pb geochronology and depositional environment and sedimentary provenance results, we demonstrate that the Saricakaya Basin is an Eocene sedimentary basin with sediment sourced from both the IAESZ and Sogut Thrust fault to the south and north, respectively, and formed primarily by flexural loading from north-south shortening along the syncollisional Sogut Thrust. Our results refine the timing of collision between the Anatolides and Pontide terranes in western Anatolia to Maastrichtian-Middle Paleocene and Early Eocene crustal shortening and basin formation. Furthermore, we demonstrate contemporaneous collision, deformation, and magmatism across the IAESZ, supporting synchronous collision models. We show that regional postcollisional magmatism can be explained by renewed underthrusting instead of slab breakoff. This new IAESZ chronology provides additional constraints for kinematic, geodynamic, and biogeographic reconstructions of the Mediterranean domain.
KW  - Anatolia
KW  - geochronology
KW  - collision
KW  - Eocene
KW  - detrital zircons
Y1  - 2019
U6  - https://doi.org/10.1029/2019TC005683
SN  - 0278-7407
SN  - 1944-9194
VL  - 38
IS  - 10
SP  - 3652
EP  - 3674
PB  - American Geophysical Union
CY  - Washington
ER  - 
TY  - JOUR
A1  - Thiede, Rasmus Christoph
A1  - Sobel, Edward
A1  - Chen, Jie
A1  - Schoenbohm, Lindsay M.
A1  - Stockli, Daniel F.
A1  - Sudo, Masafumi
A1  - Strecker, Manfred
T1  - Late Cenozoic extension and crustal doming in the India-Eurasia collision zone new thermochronologic constraints from the NE Chinese Pamir
JF  - Tectonics
N2  - The northward motion of the Pamir indenter with respect to Eurasia has resulted in coeval thrusting, strike-slip faulting, and normal faulting. The eastern Pamir is currently deformed by east-west oriented extension, accompanied by uplift and exhumation of the Kongur Shan (7719m) and Muztagh Ata (7546m) gneiss domes. Both domes are an integral part of the footwall of the Kongur Shan extensional fault system (KES), a 250 km long, north-south oriented graben. Why active normal faulting within the Pamir is primarily localized along the KES and not distributed more widely throughout the orogen has remained unclear. In addition, relatively little is known about how deformation has evolved throughout the Cenozoic, despite refined estimates on present-day crustal deformation rates and microseismicity, which indicate where crustal deformation is presently being accommodated. To better constrain the spatiotemporal evolution of faulting along the KES, we present 39 new apatite fission track, zircon U-Th-Sm/He, and Ar-40/Ar-39 cooling ages from a series of footwall transects along the KES graben shoulder. Combining these data with present-day topographic relief, 1-D thermokinematic and exhumational modeling documents successive stages, rather than synchronous deformation and gneiss dome exhumation. While the exhumation of the Kongur Shan commenced during the late Miocene, extensional processes in the Muztagh Ata massif began earlier and have slowed down since the late Miocene. We present a new model of synorogenic extension suggesting that thermal and density effects associated with a lithospheric tear fault along the eastern margin of the subducting Alai slab localize extensional upper plate deformation along the KES and decouple crustal motion between the central/western Pamir and eastern Pamir/Tarim basin.
KW  - Pamir
KW  - gneiss domes
KW  - collision
KW  - extension
KW  - thermochronology
KW  - exhumation
Y1  - 2013
U6  - https://doi.org/10.1002/tect.20050
SN  - 0278-7407
VL  - 32
IS  - 3
SP  - 763
EP  - 779
PB  - American Geophysical Union
CY  - Washington
ER  -