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Doklady Earth Sciences

, Volume 479, Issue 1, pp 295–299 | Cite as

Early Paleozoic UHT/LP Metamorphism in the Sangilen Block of the Tuvino-Mongolian Massif

  • P. Ya. Azimov
  • I. K. Kozakov
  • V. A. Glebovitsky
Geology
  • 17 Downloads

Abstract

The PT conditions of Early Paleozoic metamorphism in the Sangilen block of the Tuvino-Mongolian Massif (southeastern part of the Central Asian Mobile Belt) achieved a value of 910–950°C and 3–4 kbar, which corresponded to the conditions of ultrahigh temperature–low pressure (UHT/LP) metamorphism. During retrograde metamorphism, cooling down to 850°C was accompanied by compression (up to 5.5–7 kbar), and then cooling down to 580–650°C took place at nearly the same pressure (5.5–6.5 kbar). UHT metamorphism was related to the elevated heat flow from the mantle, leading also to an intensive basite magmatism. The “counter-clockwise” PT evolution was evoked by underthrusting of the hot tectonic slab (Erzin complex) beneath the colder one (Moren complex).

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Copyright information

© Pleiades Publishing, Ltd. 2018

Authors and Affiliations

  • P. Ya. Azimov
    • 1
  • I. K. Kozakov
    • 1
  • V. A. Glebovitsky
    • 1
    • 2
  1. 1.Institute of Precambrian Geology and GeochronologyRussian Academy of SciencesSt. PetersburgRussia
  2. 2.St. Petersburg State UniversitySt. PetersburgRussia

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