PALEOARCHEAN MAFIC ROCKS OF THE SOUTHWESTERN SIBERIAN CRATON: PRELIMINARY GEOCHRONOLOGY AND GEOCHEMICAL CHARACTERIZATION
https://doi.org/10.5800/GT-2017-8-3-0267
Аннотация
The Siberian craton consists of Archean blocks, which were welded up into the same large unit by ca 1.9 Ga [Gladkochub et al., 2006; Rojas-Agramonte et al., 2011]. The history of the constituent Archean blocks is mosaic because of limited number of outcrops, insufficient sampling coverage because of their location in remote regions and deep forest and difficulties with analytical studies of ancient rocks, which commonly underwent metamorphic modifications and secondary alterations. In this short note, we report data on discovery of unusual for Archean mafic rocks of ultimate fresh appearance. These rocks were discovered within southwestern Siberian craton in a region near a boundary between Kitoy granulites of the Sharyzhalgai highgrade metamorphic complex and Onot green-schist belt (Fig. 1). Here we present preliminary data on geochronology of these rocks and provide their geochemical characterization.
Об авторах
A. V. Ivanov
Institute of the Earth’s Crust, Siberian Branch of RAS
Россия
Irkutsk
Россия
Irkutsk
I. V. Levitsky
A.P. Vinogradov Institute of Geochemistry, Siberian Branch of RAS
Россия
Irkutsk
Россия
Irkutsk
V. I. Levitsky
A.P. Vinogradov Institute of Geochemistry, Siberian Branch of RAS
Россия
Irkutsk
Россия
Irkutsk
E. I. Demonterova
Institute of the Earth’s Crust, Siberian Branch of RAS
Россия
Irkutsk
Россия
Irkutsk
L. Z. Reznitsky
Institute of the Earth’s Crust, Siberian Branch of RAS
Россия
Irkutsk
Россия
Irkutsk
Список литературы
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2. Gladkochub D.P., Pisarevsky S.A., Donskaya T.V., Natapov L.M., Mazukabzov A.M., Stanevich A.M., Sklyarov E.V., 2006. The Siberian craton and its evolution in terms of the Rodinia hypothesis. Episodes 29 (3), 169–174.
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4. Rojas-Agramonte Y., Kröner A., Demoux A., Xia X., Wang W., Donskaya T., Liu D., Sun M., 2011. Detrital and xenocrystic zircon ages from Neoproterozoic to Palaeozoic arc terranes of Mongolia: Significance for the origin of crustal fragments in the Central Asian Orogenic Belt. Gondwana Research 19 (3), 751–763. https://doi.org/10.1016/j.gr. 2010.10.004.
5. Sun S.-S., McDonough W.F., 1989. Chemical and isotopic systematics of oceanic basalts: Implications for mantle composition and process. In: A.D. Saunders, M.J. Norry (Eds.), Magmatism in the oceanic basins. Geological Society, London, Special Publications, vol. 42, p. 313–345. https://doi.org/10.1144/GSL.SP.1989.042.01.19.
6. Turkina O.M., Berezhnaya N.G., Lepekhina E.N., Kapitonov I.N., 2012. U-Pb (SHRIMP II), Lu-Hf isotope and trace element geochemistry of zircons from high-grade metamorphic rocks of the Irkut terrane, Sharyzhalgay uplift: Implication for the NeoArchaean evolution of the Siberian craton. Gondwana Research 21 (4), 801–817. https://doi.org/ 10.1016/j.gr.2011.09.012.
Рецензия
При поддержке: Russian Science Foundation
Для цитирования:
Ivanov A.V., Levitsky I.V., Levitsky V.I., Demonterova E.I., Reznitsky L.Z. PALEOARCHEAN MAFIC ROCKS OF THE SOUTHWESTERN SIBERIAN CRATON: PRELIMINARY GEOCHRONOLOGY AND GEOCHEMICAL CHARACTERIZATION. Геодинамика и тектонофизика. 2017;8(3):477-480. https://doi.org/10.5800/GT-2017-8-3-0267
For citation:
Ivanov A.V., Levitsky I.V., Levitsky V.I., Demonterova E.I., Reznitsky L.Z. PALEOARCHEAN MAFIC ROCKS OF THE SOUTHWESTERN SIBERIAN CRATON: PRELIMINARY GEOCHRONOLOGY AND GEOCHEMICAL CHARACTERIZATION. Geodynamics & Tectonophysics. 2017;8(3):477-480. https://doi.org/10.5800/GT-2017-8-3-0267
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