Structural evolution of metamorphic rocks in the Talas Alatau, Tien Shan, Central Asia: Implication for early stages of the Talas-Ferghana Fault

Voytenko, Viacheslav; Khudoley, A. K.

doi:10.1016/j.crte.2011.11.004

Cited by 15 publications

(6 citation statements)

References 21 publications

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“…The primary phase of dextral movement along the Talas‐Fergana from ~300–270 Ma [ Alexeiev et al , ; Voytenko and Khudoley , ; Konopelko et al , ; Rolland et al , ; Konopelko et al , ], by which time the Karakum‐Tarim‐Kazakh‐Kyrgyz collision had commenced and/or was complete (Figure ), indicates that the Talas‐Fergana fault accommodated syn‐collisional‐post‐collisional kinematic reorganization at a regional scale, from convergent to strike‐slip tectonics. Whereas the ~323–306 Ma, Andean phase of the Gissar arc overlapped with a proposed early, ~315–300 Ma phase of low‐slip, top‐to‐the‐south, dextral‐transpressional deformation along the Talas‐Fergana fault [ Rolland et al , ], the ~304–288 Ma, syn‐collisional phase of the Gissar arc coincided with the early component of primary dextral slip along the fault.…”

Section: Discussionmentioning

confidence: 99%

Birth, life, and demise of the Andean–syn‐collisional Gissar arc: Late Paleozoic tectono‐magmatic‐metamorphic evolution of the southwestern Tian Shan, Tajikistan

et al. 2017

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The amalgamation of the Central Asian Orogenic Belt in the southwestern Tian Shan in Tajikistan is represented by tectono‐magmatic‐metamorphic processes that accompanied late Paleozoic ocean closure and collision between the Karakum‐Tarim and Kazakh‐Kyrgyz terranes. Integrated U‐Pb geochronology, thermobarometry, pseudosection modeling, and Hf geochemistry constrain the timing and petro‐tectonic nature of these processes. The Gissar batholith and the Garm massif represent an eastward, along‐strike increase in paleodepth from upper‐batholith (~21–7 km) to arc‐root (~36–19 km) levels of the Andean–syn‐collisional Gissar arc, which developed from ~323–288 Ma in two stages: (i) Andean, I‐type granitoid magmatism from ~323–306 Ma due to northward subduction of the Gissar back‐arc ocean basin under the Gissar microcontinent, which was immediately followed by (ii) syn‐collisional, I‐S‐type granitoid magmatism in the Gissar batholith and the Garm massif from ~304–288 Ma due to northward subduction/underthrusting of Karakum marginal‐continental crust under the Gissar microcontinent. A rapid isotopic pull‐up from ~288–286 Ma signals the onset of juvenile, alkaline‐syenitic, post‐collisional magmatism by ~280 Ma, which was driven by delamination of the Gissar arclogite root and consequent convective asthenospheric upwelling. Whereas M–HT/LP prograde metamorphism in the Garm massif (650–750°C/6–7 kbar) from ~310–288 Ma was associated with subduction‐magma inundation and crustal thickening, HT/LP heating and decompression to peak‐metamorphic temperatures (~800–820°C/6–4 kbar) at ~288 ± 6 Ma was driven by the transmission of a post‐collisional, mantle‐derived heat wave through the Garm‐massif crust.

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Section: Discussionmentioning

confidence: 99%

Birth, life, and demise of the Andean–syn‐collisional Gissar arc: Late Paleozoic tectono‐magmatic‐metamorphic evolution of the southwestern Tian Shan, Tajikistan

et al. 2017

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“…The northern Tien Shan (NTS), consisting predominantly of Precambrian and early Paleozoic metamorphosed sedimentary rocks [ Voytenko and Khudoley , ], lies to the east of the TFF. On the west side of the TFF, the middle Tien Shan (MTS) presently has a NE‐SW orientation.…”

Section: Tectonic Settingmentioning

confidence: 99%

Exhumation history of the western Kyrgyz Tien Shan: Implications for intramontane basin formation

et al. 2017

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The dextral Talas‐Fergana Fault separates the western from the central Tien Shan. Recent work has shed light on the Cenozoic evolution of the eastern and central Tien Shan; much less attention has been paid to the western Tien Shan. In this contribution we present new thermochronological ages for the Fergana and Alai ranges that, combined with the available data set, constrain the Cenozoic exhumation history of the western Tien Shan. Following a tectonically quiet early Cenozoic period, we suggest an onset of exhumation at ~25 Ma. This early onset was followed by a period of slower exhumation and in some areas minor reheating. A final, strong late Miocene rapid cooling event is well represented in the western Tien Shan as in other sectors of the range. The early onset of uplift of the western Tien Shan dissected the previously continuous westernmost Parathethyan Sea, progressively isolating basins (e.g., Fergana, Tarim, and Alai basins) in the central Asian hinterland. Moreover, the coeval timing of late Miocene uplift along the length of entire Tien Shan implies that neither the Pamir nor Tarim can be the sole driver for exhumation of the entire range.

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“…The western termination of the North Tien Shan is formed by the Talas Mountains. This range consists predominantly of Precambrian and early Palaeozoic metamorphosed sedimentary rocks (Voytenko & Khudoley 2012). The Middle Tien Shan is represented by the Chatkal Ranges and lies in the northern and northwestern part of our study area.…”

Section: Western Tien Shanmentioning

confidence: 99%

Talas–Fergana Fault Cenozoic timing of deformation and its relation to Pamir indentation

Bande

Sobel

Mikolaichuk

et al. 2015

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Regional strike-slip faults are widely distributed in continental interiors and play a major role in the distribution of far-field deformation due to continental collisions. Constraining the deformation history of the Talas-Fergana Fault (TFF), one of the largest of such faults in the Himalayan deformed interior, is vital to comprehend the hinterland kinematics of the India -Asia collision. New apatite fission track results from the NW Tien Shan define a rapid exhumation event at c. 25 Ma. This event is correlated with a synchronous pulse in the South Tien Shan, implying that both ranges experienced a simultaneous onset of rapid exhumation. We suggest that strike-slip motion along the TFF commenced at c. 25 Ma, facilitating counter-clockwise rotation of the Fergana Basin and enabling exhumation of the linked horsetail splays. Pamir indentation, located south of the Western Tien Shan, is postulated to be underway by c. 20 Ma. Recently published results suggest synchronous strike-slip deformation in the western Tarim Basin and eastern flank of the Pamir. Based on our results and published data, we are able to connect Tarim and Pamir deformation to the onset of TFF slip. We suggest that this pre-existing regional structure was responsible for transferring Pamir-induced shortening to the NW Tien Shan.

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Structural evolution of metamorphic rocks in the Talas Alatau, Tien Shan, Central Asia: Implication for early stages of the Talas-Ferghana Fault

Cited by 15 publications

References 21 publications

Birth, life, and demise of the Andean–syn‐collisional Gissar arc: Late Paleozoic tectono‐magmatic‐metamorphic evolution of the southwestern Tian Shan, Tajikistan

Birth, life, and demise of the Andean–syn‐collisional Gissar arc: Late Paleozoic tectono‐magmatic‐metamorphic evolution of the southwestern Tian Shan, Tajikistan

Exhumation history of the western Kyrgyz Tien Shan: Implications for intramontane basin formation

Talas–Fergana Fault Cenozoic timing of deformation and its relation to Pamir indentation

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