Abstract
Two successive phases of metamorphism can be recognized based on mineralogical and petrological observations coupled with geothermobarometric estimates for chemical zoning in Fe- and Al-rich metapelites from the Teya crystalline rocks of the Transangarian Yenisei Ridge. The first phase is marked by the formation of low-pressure regional metamorphic complexes of the andalusite-sillimanite type (P = 3.9–5.1 kbar; T = 510–640°C), which were most likely related to the Middle Riphean Grenville events. In the second phase, metapelitic rocks underwent Late Riphean medium-pressure collisional metamorphism of the kyanite-sillimanite type (P = 5.7–7.2 kbar, T = 660–700°C), which resulted locally in an increase in pressure in the vicinity of thrusts. These results suggest that medium-pressure kyanite-bearing metapelitic rocks were formed as a result of collision-related metamorphism caused by thrusting of the Siberian cratonal blocks onto the Yenisei Ridge in the vicinity of the Tatarka deep fault.
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Original Russian Text © I.I. Likhanov, V.V. Reverdatto, P.S. Kozlov, A.E. Vershinin, 2011, published in Doklady Akademii Nauk, 2011, Vol. 436, No. 4, pp.509–514.
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Likhanov, I.I., Reverdatto, V.V., Kozlov, P.S. et al. The Teya polymetamorphic complex in the Transangarian Yenisei Ridge: An example of metamorphic superimposed zoning of low- and medium-pressure facies series. Dokl. Earth Sc. 436, 213–218 (2011). https://doi.org/10.1134/S1028334X11020048
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DOI: https://doi.org/10.1134/S1028334X11020048