Precambrian and Early Palaeozoic metamorphic complexes in the SW part of the Central Asian Orogenic Belt: Ages, compositions, regional correlations and tectonic affinities

Skoblenko, Anfisa V.; Degtyarev, K. E.; Kanygina, N. A.; Tretyakov, А. А.; Skuzovatov, S. Yu.; Pang, Kwan‐Nang; Lee, Hao‐Yang

doi:10.1016/j.gr.2021.09.003

Cited by 10 publications

(9 citation statements)

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“…Based on the results of our study and the extant data in the literature, we propose a tectonic model explaining the geological evolution of the Precambrian metamorphic complexes in the Zheltau and Chu-Kendyktas terranes within the SW segment of the CAOB (Skoblenko et al 2022; this study). We recognize that the Precambrian evolutionary trend of the Issyk-Kul terrane differs from that of the Zheltau and Chu-Kendyktas terranes (Degtyarev et al 2017; Kanygina et al 2021).…”

Section: Discussionmentioning

confidence: 66%

“…925 Ma (Tretyakov et al 2015; Alexeiev et al 2021) (Figure 1(b)). Finally, the late Tonian age range of 840–770 Ma is widespread within the Zheltau and adjacent Chu-Kendyktas terranes and documents the timing of voluminous granitoid magmatism in the North Tien Shan and South Kazakhstan (Kröner et al 2012; Pilitsyna et al 2019; Tretyakov et al 2019; Skoblenko et al 2022, 2023). The youngest zircon age peaks of ca.…”

Section: Discussionmentioning

confidence: 69%

“…Metamorphic complexes of the Zheltau (South Kazakhstan) and Chu-Kendyktas terranes (North Tien Shan) bear a strong resemblance in terms of the development of their Precambrian meta-magmatic and metasedimentary formations, which show strong similarities in the ages and compositions of their protolith source (Paragraph 5.1; Skoblenko et al 2022). The HP rocks attributed to the Koyandy (Zheltau terrane) and Aktyuz complexes (Chu-Kendyktas terrane) are located at a distance of ∼100 km relative to each other (Figure 2) and are separated by an early Palaeozoic (531–520 Ma based on plutonic units) Dzhalair-Naiman ophiolite zone (Ryazantsev et al 2009; Kröner et al 2012).…”

Section: Discussionmentioning

confidence: 99%

“…

Figure 2. Geological map of the SE part of the Chu-Kendyktas (North Tien Shan) and Zheltau (South Kazakhstan) terranes. Age estimates for the principal rock types are after Kröner et al (2007, 2012), Ryazantsev et al (2009), Pilitsyna et al (2019) and Skoblenko et al (2022, 2023). …”

Section: Geological Backgroundmentioning

confidence: 99%

“…In the southwestern (SW) part of the CAOB, the Precambrian crust exposed in the Zheltau and Chu-Kendyktas terranes in South Kazakhstan and in the North Tien Shan and in the Issyk-Kul terrane in the North Tien Shan (Figure 1(b)) is composed of metamorphosed Palaeo-, Meso-and Neoproterozoic felsic rocks (Degtyarev et al 2011(Degtyarev et al , 2017Kröner et al 2007Kröner et al , 2012Kröner et al , 2013Pilitsyna et al 2019;Skoblenko et al 2022;Kushnareva et al 2022). HP-UHP rocks corresponding to variously retrograded eclogites and garnet-bearing quartz-feldspar gneisses (± coesite) are also common occurrences in these terranes and are interpreted to have originated from the subduction of Precambrian continental crust in the early Palaeozoic (509-474 Ma) during the closure stages of the Palaeo-Asian Ocean (e.g.…”

Section: Geological Backgroundmentioning

confidence: 99%

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High-pressure metamorphism of Precambrian continental crust in the southwestern part of the Central Asian Orogenic Belt (South Kazakhstan and North Tien Shan) and tectonic implications for the evolution of the Palaeo-Asian Ocean

Skoblenko (Pilitsyna),

Kanygina,

Dubenskiy

et al. 2023

Geol. Mag.

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In this study, we investigated the high-pressure (HP) metamorphism of the Precambrian continental crust exposed in the Zheltau terrane in South Kazakhstan (Koyandy complex) and the Chu-Kendyktas terrane in the North Tien Shan of Kyrgyzstan (Aktyuz, Kemin and Kokdzhon complexes) within the SW part of the Central Asian Orogenic Belt. HP quartz–feldspar lithologies of the Koyandy complex consist of migmatized kyanite-bearing garnet–mica paragneisses, garnet–kyanite paragneisses and their derivatives associated with eclogites. Paragneisses demonstrate prograde evolution involving mica dehydration melting and producing magnesium-rich garnet, kyanite and K-feldspar at the near-peak to retrograde stages at pressures of 15–18.5 kbar and temperatures of 800–870°C. The widespread growth of micas in these rocks reflects lower stages of retrogression at P = 10–12 kbar and T = 720–770°C. The age distributions of the cores of detrital zircon grains from the paragneisses indicate a predominance of Neoproterozoic and minor occurrence of Mesoproterozoic and Palaeoproterozoic sources of their protoliths. The ages of ∼487–485 Ma obtained from the zircon rims of the paragneisses reflect the timing of their HP metamorphic re-equilibration. These age clusters are consistent with the age estimates obtained from the rims of zircons in the eclogite-bearing garnet gneisses of the adjacent Aktyuz complex in the North Tien Shan. The P–T paths and zircon ages obtained from the high-grade quartz–feldspar gneisses of the Zheltau and Chu-Kendyktas terranes are thus interpreted to indicate involvement of the crustal material derived from the Precambrian basement (magmatic zircons aged ca. 844 Ma) and its Ediacaran–Cambrian sedimentary cover (detrital zircons with maxima at 1 Ga and 800–600 Ma) in the latest Cambrian subduction processes induced by the closure of the oceanic basins assigned to the Palaeo-Asian Ocean.

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Section: Discussionmentioning

confidence: 66%