Abstract
Studies of volcanic rocks in orogenic troughs of Eastern Kazakhstan were carried out. The troughs were formed at late-orogenic stages of evolution of Hercynian Altai collision system. Volcanic rocks are represented by basalts, andesites, dacites and rhyolites. Based on geochemical and isotopic data, the basalts and andesites derived from mafic magmas that formed as a result of partial melting of garnet peridotites in the upper mantle under the orogen. U–Pb zircon data prove two volcanic stages: more-scaled Middle Carboniferous (~311 Ma) and less-scaled Early Permian (297–290 Ma). Basalts and andesites in lower parts of the orogenic troughs and independent dacite-rhyolite structures were formed at the Middle Carboniferous stage. Parental mafic magmas were formed as a result of partial melting of mantle substrates in local transtensional zones along large shear faults. The formation of dacites and rhyolites could have been caused by partial melting of crustal substrates under effect of mafic magmas. Transtensional movements in the lithosphere of orogenic belts may indicate the beginning of collapse of orogens. A smaller volume of basalts and andesites formed at the Early Permian stage. Geochemical data prove the independent episode of partial melting in upper mantle. Synchronous basalts and andesites also appeared at wide territory in Tian Shan, Central Kazakhstan, and Central and Southern Mongolia. Early Permian volcanism indicates general extension of the lithosphere at the postorogenic stages. Large-scaled Early Permian mafic and granitoid magmatism in Central Asia has been interpreted in recent years as the Tarim Large Igneous Province caused by Tarim mantle plume activity. Thus, the extension of the lithosphere and associated volcanism in the Early Permian can be an indicator of the onset of the plume–lithosphere interaction process.
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ACKNOWLEDGMENTS
The authors are grateful to E.M. Sapargaliev (Altai Geological and Ecological Institute, Ust-Kamenogorsk, Kazakhstan) for assistance in the field works; N.G. Karmanova and I.V. Nikolaeva (both at the IGM SB RAS, Novosibirsk, Russia) for analytical rock composition studies; T.B. Bayanova (GI KSC RAS, Apatity, Russia) for Sm‒Nd isotope studies; and V.Yu. Kiseleva (IGM SB RAS) for Rb–Sr isotope studies. The authors are also grateful to the reviewers, V.V. Yarmolyuk and T.N. Kheraskova, whose comments helped to significantly improve the manuscript.
Funding
The study was carried out according to the state task of IGM SB RAS (Novosibirsk, Russia), with the support of the Russian Foundation for Basic Research (project nos. 17-05-00825, 20-05-00346, 20-35-70 076).
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Reviewers: T.N. Kheraskova, V.V. Yarmolyuk
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Khromykh, S.V., Semenova, D.V., Kotler, P.D. et al. Orogenic Volcanism in Eastern Kazakhstan: Composition, Age, and Geodynamic Position. Geotecton. 54, 510–528 (2020). https://doi.org/10.1134/S0016852120040044
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DOI: https://doi.org/10.1134/S0016852120040044