Middle Paleozoic basaltic and kimberlitic magmatism in the northwestern shoulder of the Vilyui Rift,Siberia: relations in space and time |
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| Institution: | 1. Institute of Earth’s Crust, Siberian Branch of the Russian Academy of Science, ul. Lermontova 128, Irkutsk, 664033, Russia;2. Institute of Mineral Geology, Petrography, Mineralology, and Geochemistry, Russian Academy of Sciences, Staromonetnyi per. 35, Moscow, 190017, Russia;1. V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia;2. Almazy Anabar Open Joint-Stock Company, ul. Chernyshevskogo 6, Yakutsk, 677000, Russia;3. Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090, Russia;1. Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry, Russian Academy of Sciences, Staromonetnyi per. 35, Moscow, 119017, Russia;2. A.N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninskii pr. 31, korp. 4, Moscow, 119071, Russia;3. Russian State Geological Prospecting University, ul. Miklukho-Maklaya 23, Moscow, 117937, Russia;4. Rony Kerob Ltd, Leningradskii pr. 69, bld.1, Moscow, 125315, Russia;1. Discipline of Earth Sciences, School of Environmental and Life Sciences, University of Newcastle, NSW 2308, Australia;2. School of BEES, UNSW, Sydney 2052, Australia;3. Geological Survey of NSW, PO Box 344, Hunter Region Mail Centre, 2310, Australia |
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| Abstract: | A Middle Paleozoic tectonothermal event in the eastern Siberian craton was especially active in the area of the Vilyui rift, where it produced a system of rift basins filled with Devonian–Early Carboniferous volcanics and sediments, as well as long swarms of mafic dikes on the rift shoulders. Basalts occur mostly among Middle Devonian sediments and are much less spread in Early Carboniferous formations. The dolerite dikes of the Vilyui–Markha swarm in the northwestern rift border coexist with the Mirnyi and Nakyn fields of diamond-bearing kimberlites. The voluminous dikes and sills intruded before the emplacement of kimberlites. The Mir kimberlite crosscuts a dolerite sill and a dike in the Mirnyi field, while a complex dolerite dike (monzonite porphyry) cuts through the Nyurba kimberlite in the Nakyn field. Thus, the kimberlites correspond to a longer span of Middle Paleozoic basaltic magmatism. The basalts in Middle Paleozoic sediments have faunal age constraints, but the age of dolerite dikes remains uncertain. The monzonite porphyry dike in the Nyurba kimberlite has been dated by the 40Ar/39Ar method, and the obtained age must be the upper bound of the dike emplacement. The space and time relations between basaltic and kimberlitic magmatism were controlled by Devonian plume–lithosphere interaction. |
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