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Russian Geological Research Institute (VSEGEI)
Regional Geology and Metallogeny
Journal Contents
2019
79

N.I. Gusev, L.Yu. Sergeeva, T.S. Stroev, S.O. Savel’ev, A.G. Sharipov, A.N. Larionov (VSEGEI), S.G. Skublov (IPGG RAS, SPMU)

U­-Pb age, geochemistry and Lu-­Hf systematics of zircon from intrusive traps of the western Tunguska Syneclise, the Siberian Platform

Following zircon ages (U­-Pb method, SHRIMP II) from four trap intrusions was obtained (Ma):
248 ± 2 for Vanga, 241 ± 2 for Yokche, 235 ± 1 for Degali, 230 ± 3 for Perelomnaya. Zircon geochemistry, morphology and structure confirms its magmatic origin. The duration of intrusive trap magmatism is about 20 Myr. The Lu-­Hf isotope system of zircon testifies to depleted mantle source (εHf(T) = +8…+15) and two groups of THf(DM) model ages: Riphean (0.57–0.59 Ga) and Permian (0.26–0.29 Ga). Melting of the Riphean depleted mantle of the Paleo-­Asian Ocean under the influence of the Permian plume is supposed to be a source of trap magmatism.
Keywords: Siberian Platform, trap, zircon, U­-Pb age, SHRIMP II, Lu-­Hf isotope system.

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