Proterozoic mafic magmatism in Siberian craton: An overview and implications for paleocontinental reconstruction |
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| Authors: | Dmitry P Gladkochub Sergei A Pisarevsky Tatiana V Donskaya Richard E Ernst Michael TD Wingate Ulf Söderlund Anatoliy M Mazukabzov Eugene V Sklyarov Michael A Hamilton John A Hanes |
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| Institution: | 1. Institute of the Earth''s Crust, Siberian Branch of the Russian Academy of Sciences, 128 Lermontov Str., Irkutsk 664033, Russia;2. School of GeoSciences, The University of Edinburgh, Grant Institute, The King''s Buildings, West Mains Road, Edinburg EH9 3JW, UK;3. Ernst Geosciences, 43 Margrave Avenue, Ottawa, Canada K1T 3Y2;4. Geological Survey of Western Australia, East Perth, WA 6004, Australia;5. GeoBiosphere Science Centre, Department of Geology, University of Lund, SE-22362 Lund, Sweden;6. Department of Geology, University of Toronto, Toronto, Canada M5S 3B1;g Department of Geological Sciences and Geological Engineering, Queen''s University, Kingston, Canada K7L 3N6 |
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| Abstract: | We present a summary of late Paleoproterozoic to Neoproterozoic mafic magmatism in the Siberian craton, including recently published U–Pb and 40Ar–39Ar dates. These new precise ages suggest that at least some of the previously published K–Ar ages of Siberian mafic bodies should be ignored. The time–space geochronological chart, or the ‘barcode’ of mafic magmatic events shows significant differences between northern and southern Siberia. Both are characterized by ∼1900–1700 Ma magmatic events, but then there was an almost 1 Ga mafic magmatic ‘pause’ in south Siberia until ∼800 Ma. Meanwhile there are indications of multiple mafic magmatic events in North Siberia (Anabar shield and Olenek uplift) between ∼1600 and 1000 Ma. A series of magmatic events probably related to the breakup of Rodinia occurred in southern Siberia after ∼800 Ma. So far, there are no indications of late Neoproterozoic mafic magmatism in North Siberia. Ca. 1000–950 Ma mafic sills were reported from Meso- to Neo-Proterozoic sedimentary successions in the Sette-Daban area on the east side of the Siberian craton, but their tectonic setting is debated. Recent Ar–Ar dates of ∼1750 Ma for NW-trending dykes in the Aldan and Anabar shields, together with similar-age NNE-trending Baikal uplift dykes in south-eastern Siberia suggest the existence of a giant radial dyke swarm possibly related to a mantle plume centred in the Vilyui River area. |
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| Keywords: | Proterozoic Siberian craton Mafic magmatism Dykes Geochronology |
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