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Thermomechanical Modeling of the Formation of Multi-Сhamber Intrusions for Identifying the Relationship of Plutonic Metamorphism with Gabbro-Diorite Massifs of Western Sangilen, Tuva, Russia

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Abstract

For the first time, a thermomechanical model of a system of multilevel magma chambers above a mantle heat source has been developed to explain the formation mechanisms of intrusive complexes and metamorphic aureoles in Western Sangilen. A model of “thermal blur” at the collision stage and a model of a local magma reservoir at the transtension stage are proposed. The magmatic process was studied using a numerical thermomechanical model of the system magma reservoir–magma transport–formation of intermediate chambers–formation of metamorphic zonal complexes around intrusions at different depth levels. Modeling explains the mosaic distribution of granulite metamorphism zones in the Sangilen block. Model estimates of the duration of intrusive processes were obtained. The change in tectonic regimes in the evolution of Western Sangilen affects the depth of emplacement of gabbro–monzodiorite massifs and surrounding metamorphic aureoles.

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ACKNOWLEDGMENTS

The authors thank the anonymous reviewers for useful comment. The authors are grateful to Dr. A.A. Shchipansky (Geological Institute, Russian Academy of Sciences, Moscow) for his attention to our research. We also thank PhD A.V. Babichev, PhD S.V. Zinov’ev, and S.A. Kargopolov (all at the Sobolev Institute of Geology and Mineralogy, Siberian Branch, the Russian Academy of Sciences, Novosibirsk) for their participation in field works, and M.N. Shoupletsova, editor of the journal Geotectonics, for her attentive handling our paper and editing.

Funding

The work was carried out under a state contract for the Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, and was supported by the Russian Foundation for Basic Research (project no. 17-05-00848).

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Authors and Affiliations

  1. Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, 630090, Novosibirsk, Russia

    O. P. Polyansky, A. E. Izokh, A. N. Semenov, A. Yu. Selyatitskii, R. A. Shelepaev & V. V. Egorova

  2. Novosibirsk State University, 630090, Novosibirsk, Russia

    A. E. Izokh

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  1. O. P. Polyansky
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  2. A. E. Izokh
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  3. A. N. Semenov
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  5. R. A. Shelepaev
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  6. V. V. Egorova
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Correspondence to O. P. Polyansky.

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Translated by N. Astafiev

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Polyansky, O.P., Izokh, A.E., Semenov, A.N. et al. Thermomechanical Modeling of the Formation of Multi-Сhamber Intrusions for Identifying the Relationship of Plutonic Metamorphism with Gabbro-Diorite Massifs of Western Sangilen, Tuva, Russia. Geotecton. 55, 1–19 (2021). https://doi.org/10.1134/S001685212101009X

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