Calc-alkaline volcanic rocks and zircon ages of the late Tonian: early 
Cryogenian arc-related Big Naryn Complex in the Eastern Djetim-Too Range, 
Middle Tianshan block, Kyrgyzstan

Terbishalieva, Baiansuluu; Timmerman, Martin Jan; Mikolaichuk, Alexander; Altenberger, Uwe; Sláma, Jiří; Schleicher, Anja Maria; Sudo, Masafumi; Sobel, Edward R.; Cichy, Sarah Bettina

doi:10.1007/s00531-020-01956-z

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Calc-alkaline volcanic rocks and zircon ages of the late Tonian: early Cryogenian arc-related Big Naryn Complex in the Eastern Djetim-Too Range, Middle Tianshan block, Kyrgyzstan

Authors

Terbishalieva, Baiansuluu
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Timmerman, Martin Jan
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Mikolaichuk, Alexander
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Altenberger, Uwe
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Sláma, Jiří
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Schleicher, Anja Maria
3.1 Inorganic and Isotope Geochemistry, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Sudo, Masafumi
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Sobel, Edward R.
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Cichy, Sarah Bettina
3.6 Chemistry and Physics of Earth Materials, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

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Citation

Terbishalieva, B., Timmerman, M. J., Mikolaichuk, A., Altenberger, U., Sláma, J., Schleicher, A. M., Sudo, M., Sobel, E. R., Cichy, S. B. (2021): Calc-alkaline volcanic rocks and zircon ages of the late Tonian: early Cryogenian arc-related Big Naryn Complex in the Eastern Djetim-Too Range, Middle Tianshan block, Kyrgyzstan. - International Journal of Earth Sciences, 110, 353-375.
https://doi.org/10.1007/s00531-020-01956-z

Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5004125

Abstract

The Big Naryn Complex (BNC) in the East Djetim-Too Range of the Kyrgyz Middle Tianshan block is a tectonized, at least 2 km thick sequence of predominantly felsic to intermediate volcanic rocks intruded by porphyric rhyolite sills. It overlies a basement of metamorphic rocks and is overlain by late Neoproterozoic Djetim-Too Formation sediments; these also occur as tectonic intercalations in the BNC. The up to ca. 1100 m thick Lower Member is composed of predominantly rhyolites-to-dacites and minor basalts, while the at least 900 m thick pyroclastic Upper Member is dominated by rhyolitic-to-dacitic ignimbrites. Porphyric rhyolite sills are concentrated at the top of the Lower Member. A Lower Member rhyolite and a sill sample have LA-ICP-MS U–Pb zircon crystallization ages of 726.1 ± 2.2 Ma and 720.3 ± 6.5 Ma, respectively, showing that most of the magmatism occurred within a short time span in the late Tonian–early Cryogenian. Inherited zircons in the sill sample have Neoarchean (2.63, 2.64 Ga), Paleo- (2.33–1.81 Ga), Meso- (1.55 Ga), and Neoproterozoic (ca. 815 Ma) ages, and were derived from a heterogeneous Kuilyu Complex basement. A 1751 ± 7 Ma 40Ar/39Ar age for amphibole from metagabbro is the age of cooling subsequent to Paleoproterozoic metamorphism of the Kuilyu Complex. The large amount of pyroclastic rocks, and their major and trace element compositions, the presence of Neoarchean to Neoproterozoic inherited zircons and a depositional basement of metamorphic rocks point to formation of the BNC in a continental magmatic arc setting.