Calc-alkaline volcanic rocks and zircon ages of the late Tonian: early Cryogenian arc-related Big Naryn Complex in the E
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ORIGINAL PAPER
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 Baiansuluu Terbishalieva1,2,4 · Martin Jan Timmerman1 · Alexander Mikolaichuk2,4 · Uwe Altenberger1 · Jiří Sláma3 · Anja Maria Schleicher5 · Masafumi Sudo1 · Edward R. Sobel1 · Sarah B. Cichy1,5 Received: 1 April 2020 / Accepted: 28 October 2020 © The Author(s) 2020
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 rhyolitesto-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. Keywords Tianshan orogenic belt · Big Naryn complex · Tonian–Cryogenian · Magmatic arc · Calc-alkaline · Kuilyu complex
Introduction Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00531-020-01956-z) contains supplementary material, which is available to authorized users. * Baiansuluu Terbishalieva [email protected] 1
Institute of Geosciences, University of Potsdam, 14476 Potsdam, Germany
2
Institute of Geology, National Academy of Sciences, Erkindik Avenue‑30, Bishkek 720481, Kyrgyzstan
3
Institute of Geology, The Czech Academy of Sciences, Prague 16500, Czech Republic
4
Northern-Kyrgyz Geological Expedition, Chu Area, Ivanovka 725008, Kyrgyzstan
5
Helmholtz Centre Potsdam, GFZ German Research Centre for Geosciences, Telegrafenberg, 14473 Potsdam, Germany
Volcanic and plutonic rocks are widespread in the central part of the Kyrgyz Middle Tianshan block (MTS) and were long considered as part of a once-continuous continental arc related to
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