Detrital zircon U Pb geochronology of middle Paleozoic sandstones from the South Tianshan (Kyrgyzstan): Implications for provenance and tectonic evolution of the Turkestan Ocean

Biske, Yu. S.; Алексеев, Д. В.; Ershova, V. B.; Priyatkina, Nadezhda; DuFrane, S. Andrew; Khudoley, A. K.

doi:10.1016/j.gr.2019.04.010

Cited by 17 publications

(3 citation statements)

References 63 publications

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“…Voluminous early Middle Palaeozoic arc-related granitoids and volcanic rocks were recently recognized in this region and are considered to have been formed by subduction of the South Tianshan Ocean (Han et al, 2004;Xu et al, 2006;Zhu, Li, et al, 2008;Gao et al, 2012;Lin et al, 2013;Chen et al, 2014;Ge et al, 2014;Wang, Zhai, et al, 2018;Wang, Klemd, et al, 2018;Zhong et al, 2019). The whole-rock Nd and zircon Hf isotopic data of the Early Palaeozoic arc-type magmatic rocks indicate that a Precambrian crust exist in the South Tianshan (Biske et al, 2019;Zhong et al, 2019).…”

Section: Geological Backgroundmentioning

confidence: 98%

Age and tectonic setting of Neoproterozoic gneissic granites in the southern Yili Block (NW China) and implications for the origins of the continental blocks in SW Central Asian Orogenic Belt

et al. 2021

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Several ribbon-like continental fragments with Precambrian basement were wrapped within Palaeozoic accretionary complexes in the southwest Central Asian Orogenic Belt (CAOB). Their origins and tectonic evolution are essential for understanding the accretionary orogeny of the CAOB and crustal growth versus continental reworking in Phanerozoic. The southern Yili Block in NW of China is one of the major continental fragments in SW CAOB. In order to better constrain the tectonic settings of the Precambrian basement of the southern Yili Block, we present new data of field structures, whole-rock geochemical compositions, zircon U-Pb ages and Lu-Hf isotopic ratios of the Neoproterozoic gneissic granites. Ductile deformation characterized by mylonitic foliations and stretching/mineral lineation is commonly recognized in the gneissic granites, which were cross-cut by undeformed granitoids and mafic dykes. The gneissic granites yielded zircon U-Pb ages of 968 ± 5 Ma, 948 ± 8 Ma, and 873 ± 9 Ma. These gneissic granites show geochemical features of high potassium, peraluminous, calc-alkaline series, enrichment of Th, K, Rb and depletion of Ba, Nd, Sr. They show zircon ε Hf (t) values from À5.5 to 2.0 and two-stage zircon Hf model ages between 1.7 and 2.1 Ga. These new results indicate that the Neoproterozoic gneissic granites in the southern Yili Block derived from partial melting of metagreywackes that most likely had formed in a continental arc setting. A comparison of stratigraphy, magmatism and detrital zircon ages suggests that the southern Yili Block is similar with the northern Yili Block and Chinese Central Tianshan Block in term of Precambrian basement, and these continental fragments might have originated from Neoproterozoic orogenic belts. K E Y W O R D S crustal reworking, Kazakhstan microcontinent, microplate tectonics, Precambrian basement, tectonic evolution, Tianshan (Tien Shan) orogenic belt 1 | INTRODUCTION The Central Asian Orogenic Belt (CAOB) is situated between Baltic-Siberia cratons to the north and Tarim-North China cratons to the south (Figure 1a). It was built by welding of numerous Precambrian microcontinents and Palaeozoic arcs via a series of accretionary com-

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Section: Geological Backgroundmentioning

confidence: 98%

Age and tectonic setting of Neoproterozoic gneissic granites in the southern Yili Block (NW China) and implications for the origins of the continental blocks in SW Central Asian Orogenic Belt

et al. 2021

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“…This implies that the northern part of the South Tianshan contains a significant proportion of accretionary wedge materials. Recently, Biske et al [32] also identified a large number of Paleozoic accretionary complexes that are continuously exposed from the northern to central parts of the South Tianshan belt and suggested that these accretionary complexes belonged to the hanging-wall of the subduction system related to the northward subduction of the Turkestan Ocean. It should be noted that our studied dykelike mafic intrusions share similar latitude position with 14 Lithosphere these accretionary complexes including the ophiolitic mélanges and turbidites.…”

Section: Tectonic Implicationsmentioning

confidence: 99%

“…As compared with those in the eastern part of the Tianshan orogenic belt, the orogenesis in the western part of the Tianshan orogenic belt (especially that in the Uzbekistan and Tajikistan parts) is less understood. In recent years, some geochronological and geochemical researches have been conducted on the granitic, sedimentary, ophiolitic, and meta-morphic rocks in the western part of the Tianshan orogenic belt, and the Late Paleozoic tectonic evolution has been roughly constrained although some issues such as the closure time of the Turkestan Ocean (also termed the South Tianshan Ocean) neighboring the Karakum-Tarim cratons to the south are still debated [31][32][33][34][35][36][37][38][39][40][41]. However, the Early Paleozoic geodynamic evolution related to the subduction of the Turkestan Ocean was not yet well addressed, although Early Paleozoic arc magmatism has been identified by recent researches [31,33,36,41,42].…”

Section: Introductionmentioning

confidence: 99%

Age and Petrogenesis of the Gabbros from Tajik South Tianshan: Implications for Early Paleozoic Geodynamic Evolution of the Southwestern Central Asian Orogenic Belt

et al. 2020

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Identification of slab window process is important for understanding the nature of the accretionary orogenesis. In this study, we report detailed petrological, geochronological, geochemical, Sr–Nd isotopic, and mineral chemical data for two dyke-like gabbroic intrusions from the South Tianshan belt of Tajikistan, southwestern margin of the Central Asian Orogenic Belt. Both intrusions are composed of coarse- and fine-grained gabbros. U–Pb zircon dating shows that they were emplaced at 431±5 Ma. The gabbroic rocks show relatively large variation in elemental and isotopic compositions, with SiO2 of 40.62–53.97 wt.%, Sr of 333–1261 ppm, and εNdt of +2.5 to +5.8. Especially, the fine-grained gabbros show lower SiO2 and higher MgO but more evolved isotopes than the coarse-grained gabbros for each of the intrusions. All the rocks display OIB-like or transitional OIB-/E-MORB-like geochemical characteristics with no obvious Nb-Ta depletion, indicative of an intraplate affinity. Combined with their mineral chemical compositions, we suggest that these gabbroic rocks were generated by partial melting of asthenospheric mantle in the transitional spinel-garnet stability field, followed by different degrees of fractional crystallization of olivine, clinopyroxene, and plagioclase and mixing with carbonatitic melts. The available data indicate that roll-back of the subducting Turkestan oceanic slab occurred during the Late Ordovician to Early Silurian period. Asthenosphere upwelling due to the opening of slab window resulted from localized slab tearing during slab roll-back may have been responsible for the generation of the studied dyke-like gabbroic intrusions.

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Paleozoic collisional belt of the South Tien Shan: A review

Biske,

Konopelko,

Seltmann

2024

Earth-Science Reviews

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Detrital zircon U Pb geochronology of middle Paleozoic sandstones from the South Tianshan (Kyrgyzstan): Implications for provenance and tectonic evolution of the Turkestan Ocean

Cited by 17 publications

References 63 publications

Age and tectonic setting of Neoproterozoic gneissic granites in the southern Yili Block (NW China) and implications for the origins of the continental blocks in SW Central Asian Orogenic Belt

Age and tectonic setting of Neoproterozoic gneissic granites in the southern Yili Block (NW China) and implications for the origins of the continental blocks in SW Central Asian Orogenic Belt

Age and Petrogenesis of the Gabbros from Tajik South Tianshan: Implications for Early Paleozoic Geodynamic Evolution of the Southwestern Central Asian Orogenic Belt

Paleozoic collisional belt of the South Tien Shan: A review

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