Central Asian Orogenic Belt (CAOB) is the largest world accretionary system consisting of a complex mosaic of crustal blocks of both continental and oceanic origin. It is proposed that the late Paleozoic and Mesozoic tectonic evolution of the Mongolian tract of the CAOB is related to the intense shortening of the whole belt between the continental jaws of Siberia and North China. Important part of the CAOB evolution is recorded in the Mongol-Altai. Here a crustal segment, represented by former Ordovician accretionary wedge, was first separated from Siberia by the opening Mongol-Okhotsk ocean and later reworked in a suprasubduction environment above the Paleo-Asian oceanic plate. The Devonian-Permian reworking led to several phases of compression and extension linked to the subducting slab advance and retreat. These events resulted into exposure of several high grade metamorphic core complexes/domes among which the selected Tsogt dome represents an outstanding example. The main aim of the PhD project is to constrain timing and character of tectono-metamorphic events leading to formation of the Tsogt dome. The emphasis will be given to characterization of internal and external parts of the dome separated by major detachment zone by means of detailed microstructural analysis combined with determination of metamorphic conditions and age.

Deadline for application: March 13, 2023

Research group

Lithospheric Deformation Research Group: website

Research group leader

Ondrej Lexa: lexa@natur.cuni.cz

Project supervisor

doc. Petr Jeřábek: jerabek.petr@natur.cuni.cz

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