CLR person interests, research and publications
Researcher
I joined this team as the administration manager on a part-time basis in October 2017, but I am also a trained geologist. I received a bachelor's degree in geology from Charles University in Prague – Institute of Petrology and Structural Geology in June 2017 for thesis entitled: “Paleomagnetic study of Paleozoic rocks from SW Mongolia” under supervision of Doc. Lexa. I continue in this topic also in my master's studies.
Research projects
The growth of eastern Pangea involves three contrasting orogenic cycles: 1) Baikalian cycle (570-540 Ma) consists of accretion of peri-Rodinian continental, Mirovoi and Panthalassan oceanic fragments to the Siberian margin followed by extensional HT reworking, the growth of magmatic arc, giant accretionary wedge and intraoceanic basin. 2) Altai cycle is typified by crustal thickening followed by syn-extensional melting of the accretionary wedge (420-380 Ma) and the opening of Mongol-Okhotsk ocean.
We aim to study and compare various aspects that are related to exhumation of deeply buried felsic rocks that form now Devonian and Carboniferous granulite-migmatite domes in the Variscan belt and contributed thus to large-scale crustal differentiation. The role of melting on the rheological weakening of the rocks is known for a long time, but differences of the melting processes of metasedimentary rocks and granitoid rocks, with respect to fluid-present, dehydration and fluid-fluxed melting and relation to the P-T path of the rocks are rarely studied simultaneously.
Since the late Proterozoic to Permian times accretionary systems developed at periphery of a palaeo-Pacific ocean. At the same time formed giant Central Asian Orogenic Belt (CAOB) being located inside the NE part of the Pangea supercontinent. This orogen thus reveals features of both peripheral and interior orogens. In this project it is proposed that the CAOB precursor evolved at the periphery of paleo-Pacific, was later transferred into the interior of the Pangean continental realm and finally bended and shortened between Siberian and North China cratonic jaws.
It is well known that the inherited architecture of extended continental margins controls the collisional processes and deformation structure of ensuing orogens. However, the classical hyperextended margins of the Atlantic type differ substantially from the extended continental margins above the west-Pacific subduction systems, which are characterized by massive crustal melting, intrusion of large portions of mafic magmas and HT-LP metamorphism.
Melting processes in metagranitoids will be investigated by answering following questions: 1. Is the pervasive melt flow on grain boundaries the major melt transport mechanism in metagranitoids, instead of interconnected leucosome network known from metasediments? 2. Do the large melt quantities in metagranitoids result from fluid-fluxed melting and how the fluids entre the migmatites? Are dehydration melting and fluid-fluxed domains contemporaneous or superimposed? 3.