The Teya polymetamorphic complex in the Transangarian Yenisei Ridge: An example of metamorphic superimposed zoning of low- and medium-pressure facies series |
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| Authors: | I I Likhanov V V Reverdatto P S Kozlov and A E Vershinin |
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| Institution: | (1) Departamento de Qu?mica Inorg?nica, Cristalograf?a y Mineralog?a. Facultad de Ciencias, Universidad de M?laga, 29071 M?laga, Spain;(2) Instituto Andaluz de Ciencias de la Tierra. Facultad de Ciencias, CSIC-Universidad de Granada, 18071 Granada, Spain |
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| 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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