40Ar/39Ar dating of Usol'skii sill in the south-eastern Siberian Traps Large Igneous Province: evidence for long-lived magmatism |
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| Authors: | Alexei V Ivanov Sergei V Rasskazov Gennady D Feoktistov Huaiyu He Ariel Boven |
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| Institution: | Institute of the Earth's Crust, Siberian Branch, Russian Academy of Sciences, Lermontov st., 128, 664033 Irkutsk, Russia;;Institute of Geology and Geophysics, Chinese Academy of Sciences, PO Box 9825, 100029 Beijing, China;;Graystreet 133, B1050 Brussels, Belgium |
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| Abstract: | Main part of the Siberian Traps Large Igneous Province was formed in a short time-span at the Permo-Triassic boundary c. 250 Ma. New 40Ar/39Ar dating results for the Usol'skii dolerite sill in south-eastern part of the province indicate its probable emplacement c. 6 Myr after the main Permo-Triassic magmatic phase. Compilation of the published 40Ar/39Ar and U-Pb ages implies that basaltic and related magmatism lasted in total as long as 22–26 Myr. Therefore, similar to other large igneous provinces, magmatism of the Siberian Traps combined voluminous short-lived and less prominent long-lived events. |
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