Geodynamic evolution of the western Tien Shan, Uzbekistan: Insights from U-Pb SHRIMP geochronology and Sr-Nd-Pb-Hf isotope mapping of granitoids

Dolgopolova, Alla; Seltmann, Reimar; Konopelko, Dmitry; Biske, Yu. S.; Shatov, V.; Armstrong, Robin; Белоусова, Е. А.; Pankhurst, R. J.; Koneev, Rustam I.; Диваев, Ф. К.

doi:10.1016/j.gr.2016.10.022

Cited by 88 publications

(71 citation statements)

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“…Some authors proposed that the opening of the South Tianshan Ocean was initiated by back‐arc rifting off the CTB from the northern Tarim Craton in the early Devonian (Han et al, , Han, Zhao, Cawood, et al, ). However, this is inconsistent with the closure of the Terskey Ocean at ~470 Ma (Konopelko et al, ; Lomize et al, ; Qian et al, ) and the >440 Ma Wuwamen ophiolite (this study) as well as the ~448–422 Ma ophiolitic mélanges with early Ordovician to early Silurian fossils in the Kyrgyz South Tianshan (Table S10 and Figure ; Alexeiev et al, ; Biske & Seltmann, ; Dolgopolova et al, ; Wang et al, ). In addition, Safonova et al () reported late Silurian to early Carboniferous elements consistent with an ocean plate stratigraphy in the Kyrgyz South Tianshan and thus suggested that the South Tianshan Ocean was a relatively large oceanic realm during this period.…”

Section: Discussioncontrasting

confidence: 65%

“…The SCTSZ roughly runs from east to west along the Baluntai fault, the south Nalati fault, and the Atbashi–Inylchek fault, and continues along the south Ferghana fault to the west of the Talas–Ferghana fault. The suture zone is marked by discrete late Neoproterozoic to Carboniferous ophiolitic mélanges, (U)HP metamorphic terranes (i.e., Akyazi, Atbashi, and Kassan), and ocean plate stratigraphical elements (e.g., Alexeiev et al, ; Dolgopolova et al, ; Gao et al, ; Hegner et al, ; Jiang et al, ; Mühlberg et al, ; Safonova et al, ; Sang et al, ). However, some authors dispute that the Kyrgyz Middle Tianshan is the westward extension of the Chinese Central Tianshan and, instead, interpret the STB as its westward extension bounded by the south Nalati–Atbashi–Inylchek fault (also SCTSZ) to the north (Charvet et al, ; Wang et al, ; Wang, Zhai, et al, ).…”

Section: Geological Settingmentioning

confidence: 99%

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Final Assembly of the Southwestern Central Asian Orogenic Belt as Constrained by the Evolution of the South Tianshan Orogen: Links With Gondwana and Pangea

et al. 2018

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The South Tianshan Orogen marks the final assembly of the southwestern Central Asian Orogenic Belt (CAOB) and the Karakum–Tarim cratons. Here we present an integrated mineralogical, geochemical, and geochronological study of the Wuwamen ophiolitic mélange in the South Tianshan to better understand the tectonic evolution of the western CAOB and its links to Gondwana and Pangea. Mantle peridotites with mineral compositions similar to those of abyssal peridotites and basalts with N‐MORB geochemical affinities suggest that the Wuwamen ophiolite was formed in a mid‐ocean ridge setting. Arc‐related gabbro and plagiogranite stocks intruding the mantle peridotites yielded zircon U–Pb ages of 441.1 ± 4.2 and 442.8 ± 2.4 Ma, indicating that the Wuwamen ophiolite got emplaced prior to ~440 Ma. Sericite‐quartz schist from the ophiolitic mélange matrix with abundant 481–319 Ma detrital zircon grains is crosscut by a two‐mica granite dike with a zircon U–Pb age of 321.3 ± 1.7 Ma, thereby constraining the formation of the Wuwamen ophiolitic mélange at ~320 Ma. In conjunction with published data, we propose that the South Tianshan Ocean opened in the late Neoproterozoic and promoted the subsequent separation of microcontinents in the western CAOB from the northeast Gondwana margin during Gondwana assembly. Furthermore, the closure of the South Tianshan Ocean led to the final assembly of the southwestern CAOB and the Karakum–Tarim cratons and their incorporation into Pangea at ~320 Ma.

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Section: Discussioncontrasting

confidence: 65%

Section: Geological Settingmentioning

confidence: 99%

Final Assembly of the Southwestern Central Asian Orogenic Belt as Constrained by the Evolution of the South Tianshan Orogen: Links With Gondwana and Pangea

et al. 2018

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“…To the west the Central Tien Shan Ocean closed completely in the latest Carboniferous, and closure was followed by a phase of Early Permian post-collisional exensional magmatism (e.g. Dolgopolova et al 2017;Konopelko et al 2017). The subsequent Mesozoic history of the Tien Shan is characterized by episodes of intracontinental tectonism, with the final phase in Cenozoic times related to far-field effects of the India-Asia collision (e.g.…”

mentioning

confidence: 99%

“…Post-collisional intrusions east and west of the Talas -Fergana Fault are dated as Early Permian (e.g. Konopelko et al 2007Konopelko et al , 2017Dolgopolova et al 2017). Seltmann et al (2011) have noted that the South Tien Shan region contains deformed forearc accretionary complexes as well as passive margin sediments.…”

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Geological evolution of Central Asian Basins and the western Tien Shan Range

Brunet

Sobel

McCann³

2017

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The geological evolution of Central Asia commenced with the evolution of a complex Precambrian–Palaeozoic orogen. Cimmerian blocks were then accreted to the southern margin during the Mesozoic, leading to tectonic reactivation of older structures and discrete episodes of basin formation. The Indian and Arabian blocks collided with Asia during the Cenozoic, leading to renewed structural reactivation, intracontinental deformation and basin development. This complex evolution resulted in the present-day setting of an elongated Tien Shan range flanked by large Mesozoic–Cenozoic sedimentary basins with smaller intramontane basins distributed within the range. The aim of this volume is to present multidisciplinary results and reviews from research groups in Europe and Central Asia that focus on the western part of the Tien Shan and some of the large sedimentary basins in that area. These works elucidate the Late Palaeozoic–Cenozoic tectono-sedimentary evolution of the area. Emphasis is placed on the collision of terranes and/or continents and the ensuing fault reactivation; the impact of changes in climate on the sedimentation is also examined.

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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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Geodynamic evolution of the western Tien Shan, Uzbekistan: Insights from U-Pb SHRIMP geochronology and Sr-Nd-Pb-Hf isotope mapping of granitoids

Cited by 88 publications

References 64 publications

Final Assembly of the Southwestern Central Asian Orogenic Belt as Constrained by the Evolution of the South Tianshan Orogen: Links With Gondwana and Pangea

Final Assembly of the Southwestern Central Asian Orogenic Belt as Constrained by the Evolution of the South Tianshan Orogen: Links With Gondwana and Pangea

Geological evolution of Central Asian Basins and the western Tien Shan Range

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

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