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

Authors
  • Azimov, P. Ya.1
  • Kozakov, I. K.1
  • Glebovitsky, V. A.1, 2
  • 1 Russian Academy of Sciences, Institute of Precambrian Geology and Geochronology, St. Petersburg, Russia , St. Petersburg (Russia)
  • 2 St. Petersburg State University, St. Petersburg, Russia , St. Petersburg (Russia)
Type
Published Article
Journal
Doklady Earth Sciences
Publisher
Pleiades Publishing
Publication Date
Mar 01, 2018
Volume
479
Issue
1
Pages
295–299
Identifiers
DOI: 10.1134/S1028334X18030145
Source
Springer Nature
License
Yellow

Abstract

The P–T 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” P–T evolution was evoked by underthrusting of the hot tectonic slab (Erzin complex) beneath the colder one (Moren complex).

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