A geotraverse across two paleo-subduction zones in Tien Shan, Tajikistan

Konopelko, Dmitry; Seltmann, Reimar; Mamadjanov, Yunus; Romer, Rolf L.; Rojas‐Agramonte, Yamirka; Jeffries, Teresa; Fidaev, D. T.; Niyozov, A.

doi:10.1016/j.gr.2016.09.010

Cited by 57 publications

(64 citation statements)

References 63 publications

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“…Widespread Neoproterozoic (~970–650 Ma) igneous rocks were presumably associated with the assembly and breakup of Rodinia (Gao et al, ; Konopelko et al, , ). Intensive Paleozoic magmatism throughout the CTB is represented by Cambrian to Permian volcanic and intrusive rocks and interpreted to have formed during subduction‐related, collisional, or postcollisional stages (e.g., Gao et al, ; Glorie et al, ; Konopelko et al, ; Long et al, ; Ma et al, ; Seltmann et al, ).…”

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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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: 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.…”

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confidence: 99%

“…Xiao et al 2013); the Middle and North Tien Shan are not always present. In its western part, the South Tien Shan can be subdivided into several units from west to east (Konopelko et al 2007(Konopelko et al , 2017: the Kyzylkum, Gissar, and Alai (¼Alay) segments west of the Talas -Fergana Fault; and the Kokshal segment to the east. Lithologically they are all similar, comprising Ordovician -mid-Carboniferous pelagic sediments, partly associated with intraplate volcanics, and thick carbonate platforms (mainly Late Devonian -Early Carboniferous in age) which are best developed in the latter two segments (Biske & Seltmann 2010;Seltmann et al 2011).…”

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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.…”

mentioning

confidence: 99%

“…It subsequently closed in the latest Carboniferous, forming the Gissar Suture (e.g. Burtman 2010; Dolgopolova et al 2017;Konopelko et al 2017).…”

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confidence: 99%

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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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A geotraverse across two paleo-subduction zones in Tien Shan, Tajikistan

Cited by 57 publications

References 63 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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