Buslov, Mikhail

De Grave, Johan

Elburg, Marlina

Glorie, Stijn

Izmer, Andrei

Ryabinin, Alexander

Van den haute, Peter

Vandoorne, Willem

Zhimulev, Fedor

English

Ghent University Academic Bibliography

Tectonic formation and Palaeozoic evolution of the Gorny-Altai – Altai-Mongolia suture zones, revealed by zircon LA-ICP-MS U/Pb geochronology  Glorie, S.a*, De Grave, J.a, Zhimulev, F.b, Buslov, M.M.b., Izmer, A.c, Vandoorne, W.a, Ryabinin, A.b, Elburg, M.A.a, Van den haute, P.a  a MINPET Group, Dept. Geology & Soil Science, Ghent University, 281-S8, Krijgslaan, B-9000, Ghent, Belgium b Institute of Geology & Mineralogy, SBRAS, 3 prosp. Akad. Koptyuga, Novosibirsk, 630090, Russia c Dept. of Analytical Chemistry, Ghent University, Krijgslaan 281-S12, 9000 Ghent, Belgium * Corresponding author: E-mail: Stijn.Glorie@Ugent.be Tel: +32 9 264 4568 Fax: +32 9 264 4984  The Altai Mountain Belt (AMB) is located between Siberia and Kazakhstan and forms a complex collage of tectonic units, bounded by suture zones. During the Palaeozoic, Gondwana-derived terranes and subduction-accretion complexes collided progressively with the Siberian Craton. The Late-Palaeozoic final closure of the Ob-Zaisan and Ural-Mongolian branches of the Palaeo-Asian Ocean led to the collision of amalgamated Siberia with Kazakhstan and the final formation of Palaeo-Eurasia (Dobretsov et al., 1995; Buslov et al., 2001, 2004). This introduced Late-Palaeozoic reactivation (strike-slip) of pre-existing sutures and contributed to the complexity of the AMB (Buslov et al., 2004).  In order to understand the multi-stage evolution of the Siberian AMB, we performed a detailed geochronological study on these suture zones. More specifically, we focussed on the Charysh-Terekta (CT) and Kurai-Ulagan (KU) ophiolitic suture zones, which are subduction-accretion-collision zones that stitch the Gorny Altai terrane (GA) to the Altai-Mongolia block (AM) (figure). GA forms an accretionary complex, composed of fragments of Caledonian and Hercynian mobile belts. AM is a Gondwana-derived microcontinent, dominated by passive margin, shelf and continental slope sediments (Buslov et al., 2001, 2004; Safonova et al., 2004; Ota et al., 2007). Zircons were analyzed from several tectonic units, situated along both sutures (figure). Syn- and post-collisional granitoid intrusives were targetted, together with the gabbroid and associated plagiogranitic sequences of the ophiolite units themselves. More than 50 zircon U/Pb ages were obtained and preliminary results point towards a Late Ediacarian – Early Cambrian formation age (550-510 Ma) of the sutures and a Late Silurian – Late Devonian age (420-360 Ma) for the syn- and post-collisional granitoids. These results corroborate well with previously reported tectonic models, which are mainly based on stratigraphy and K/Ar chronology (Buslov et al., 2001, 2004; Safonova et al., 2004; Ota et al., 2007).    Simplified tectonic map of the AMB, showing its major (Pre)-Palaeozoic tectonic units: A = Maralikha-Zasurin, B = Uymon, C = Teletsk, D = Chagan-Uzun, E = Ulagan, F = Erekta; and bounding sutures / faults: 1 = Irtysh, 2 = North-Eastern, 3 = Charysh-Terekta, 4 = Kurai-Ulagan, 5 = Teletsk-Bashkauss, 6 = Shapshal, 7 = West-Sayan. Meso-Cenozoic basins: I = Teletskoye, II = Kurai, III = Chuya, IV = Dzhulukul. Continental blocks (inset): SB = Siberia, KZ = Kazakhstan, T = Tarim, NC = North-China (after Buslov et al., 2004; Ota et al., 2007).  References:  Buslov, M.M., Safonova, I.Yu., Watanabe, T., Obut, O.T., Fujiwara, Y., Iwata, K., Semakov, N.N., Sugai, Y., Smirnova, L.V., Kazansky, A.Yu. 2001. Evolution of the Palaeo-Asian Ocean (Altai-Sayan region, Central Asia) and collision of possible Gondwana-derived terranes with the southern marginal part of the Siberian continent. Geosciences Journal, 5 (3), 203-224.  Buslov, M.M., Watanabe, T., Fujiwara, Y., Iwata, K., Smirnova, L.V., Safonova, I. Yu., Semakov, N.N., Kiryanova, A.P. 2004. Late Paleozoic faults of the Altai region, Central Asia: tectonic pattern and model of formation. Journal of Asian Earth Sciences, 23, 655-671.  Dobretsov, N.L., Berzin, N.A., Buslov, M.M. 1995. Opening and tectonic evolution of the Paleo-Asian Ocean. International Geology Review, 37, 335-360.  Ota, T., Utsunomiya, A., Uchio, Y., Isozaki, Y., Buslov, M.M., Ishikawa, A., Maruyama, .S, Kitajima, K., Kaneko, Y., Yamamoto, H., Katayama, I. 2007. Geology of the Gorny Altai  subduction-accretion complex, southern Siberia: Tectonic evolution of an Ediacarian-Cambrian intra-oceanic arc-trench system. Journal of Asian Earth Sciences, 30, 666-695. Safonova, I.Yu., Buslov, M.M., Iwata, K., Kokh, D.A. 2004. Fragments of Vendian-Early Carboniferous Oceanic Crust of the Paleo-Asian Ocean in Foldbelts of the Altai-Sayan Region of Central Asia: Geochemistry, Biostratigraphy and Structural setting. Gondwana Research, 7 (3), 771-790.  

Tectonic formation and Palaeozoic evolution of the Gorny-Altai - Altai-Mongolia suture zones, revealed by zircon LA-ICP-MS U/Pb geochronology

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Tectonic formation and Palaeozoic evolution of the Gorny-Altai - Altai-Mongolia suture zones, revealed by zircon LA-ICP-MS U/Pb geochronology

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