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The First Finding of Sapphirine in Granulites of the Angara–Kan Block: Evidence of Ultra-High–Temperature Metamorphism in the SW Siberian Craton

Authors
  • Sukhorukov, V. P.1, 2
  • Gladkochub, D. P.3
  • Turkina, O. M.1, 2
  • 1 Russian Academy of Sciences, Sobolev Institute of Geology and Mineralogy, Siberian Branch, Novosibirsk, 630090, Russia , Novosibirsk (Russia)
  • 2 Novosibirsk State University, Novosibirsk, 630090, Russia , Novosibirsk (Russia)
  • 3 Russian Academy of Sciences, Institute of the Earth’s Crust, Siberian Branch, Irkutsk, 664033, Russia , Irkutsk (Russia)
Type
Published Article
Journal
Doklady Earth Sciences
Publisher
Pleiades Publishing
Publication Date
Apr 01, 2018
Volume
479
Issue
2
Pages
443–447
Identifiers
DOI: 10.1134/S1028334X18040190
Source
Springer Nature
License
Yellow

Abstract

This work reports the first discovery of sapphirine-bearing mineral parageneses in granulites of the Angara–Kan block, information on the mineral assemblage of rocks, and the mineral composition. Based on mineral geothermometers utilizing alumina content in orthopyroxene, reconstruction of the composition of ternary feldspar, and the titanium content in zircon, it was revealed that the peak temperatures of metamorphism reached 1100°C, after which the rocks underwent cooling under sub-isobaric conditions. It is assumed that the pulse of ultra-high-temperature metamorphism correlates with processes of extension and intraplate magmatism during the age interval of 1.78–1.75 Ga.

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