Abstract

The tectonomagmatic evolution of the Sangilen massif has been described in detail in numerous publications, but little attention was given to heat sources related to the HT/LP metamorphism. Modeling of the magma transport to the upper-crust levels in West Sangilen shows that the NT/LP metamorphism is related to gabbromonodiorite intrusions. This article is focused on the thermo-mechanical modeling of melting and lifting of melts in the crust, taking into account the density interfaces. The model of the Erzin granitoid massif shows that in case of fractional melting, the magma ascent mechanism is fundamentally different, as opposed to diapir upwelling – percolation take place along a magmatic channel or a system of channels. An estimated rate of diapiric rise in the crust amounts to 0.8 cm/yr, which is more than an order of magnitude lower than the rate of melt migration in case of fractional melting (25 cm/yr). In our models, a metamorphic thermal ‘anticline’ develops in stages that differ, probably, due to the modes of crust melting: batch melting occurs at the first stage, and fractional melting takes place at the second stage. It is probable that the change of melting modes from melting conditions in a ‘closed’ system to fractional melting conditions in ‘open’ systems is determined by tectonic factors. For the Sangilen massif, we have estimated the degrees of melting in the granulite, granite, and sedimentary-metamorphic layers of the crust (6, 15, and 5 vol. %, respectively).

Translated title of the contributionРоль магматических источников тепла при формировании регионального и контактовых метаморфических ареалов Западного Сангилена (Тува)
Original languageEnglish
Pages (from-to)309-323
Number of pages15
JournalGeodynamics and Tectonophysics
Volume10
Issue number2
DOIs
Publication statusPublished - Feb 2019

Keywords

  • Contact metamorphism
  • Crust
  • Heat transfer
  • Magmatic chamber
  • Melt
  • Melting
  • Modeling
  • Sangilen
  • Zoning
  • modeling
  • MELT
  • MINGLING DYKES
  • GEODYNAMICS
  • contact metamorphism
  • SIBERIA
  • melting
  • MANTLE
  • melt
  • zoning
  • LITHOSPHERE
  • DIAPIRISM
  • COMPLEX
  • EARTHS CRUST
  • crust
  • SOUTH-EAST TUVA
  • magmatic chamber
  • heat transfer

OECD FOS+WOS

  • 1.05 EARTH AND RELATED ENVIRONMENTAL SCIENCES

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