U-Pb age, geochemistry and Lu-Hf systematics of zircon from intrusive traps of the western Tunguska Syneclise, the Siberian Platform
Abstract
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.
About the Authors
N. I. Gusev
A. P. Karpinsky Russian Geological Research Institute (VSEGEI)
Russian Federation
Russian Federation
Head of Department
L. Yu. Sergeeva
A. P. Karpinsky Russian Geological Research Institute (VSEGEI)
Russian Federation
Russian Federation
Leading Engineer
T. S. Stroev
A. P. Karpinsky Russian Geological Research Institute (VSEGEI)
Russian Federation
Russian Federation
Leading Engineer
S. O. Savel’ev
A. P. Karpinsky Russian Geological Research Institute (VSEGEI)
Russian Federation
Russian Federation
Engineer,
A. G. Sharipov
A. P. Karpinsky Russian Geological Research Institute (VSEGEI)
Russian Federation
Russian Federation
Leading Engineer
A. N. Larionov
A. P. Karpinsky Russian Geological Research Institute (VSEGEI)
Russian Federation
Russian Federation
Candidate of Geological and Mineralogical Sciences, Lead Researcher
S. G. Skublov
RAS Institute of the Precambrian Geology and Geochronology (IPGG RAS); Saint-Petersburg Mining University (SPMU)
Russian Federation
Russian Federation
Doctor of Geological and Mineralogical Sciences, Chief Researcher; Professor
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Review
For citations:
Gusev N.I., Sergeeva L.Yu., Stroev T.S., Savel’ev S.O., Sharipov A.G., Larionov A.N., Skublov S.G. U-Pb age, geochemistry and Lu-Hf systematics of zircon from intrusive traps of the western Tunguska Syneclise, the Siberian Platform. Regional Geology and Metallogeny. 2019;(79):49–67. (In Russ.)
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