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Mechanisms and time scales of formation of ribbon continents
Syahputra, Reza ; Žák, Jiří (advisor) ; Zulauf, Gernold (referee) ; Hrouda, František (referee)
Investigation into the ribbon continents has started since the 1980s; however, most studies focued on oceanic closure phase, involving the subduction, accretion, and collision. The formation of ribbon continents has received little attention, perhaps because it has less recent examples. This thesis is designed to address several possible scenarios for the formation of ribbon continent by investigating the tectonics, magmatism, and sedimentation of the former Avalonian-Cadomian belt during the break-up of the peri-Gondwana terranes and transition from the active- to passive-margin settings. The data originated from three different locations within the Bohemian Massif, the Czech Republic, which can also be viewed as a Cambro- Ordovician crustal evolution from the lower crust to the surface level: (1) intermediate to felsic of the Kdyně pluton in the Plzeň region, (2) the continental Příbram-Jince basin in the Central Bohemian region, and (3) metagranites and granitic orthogneisses of the Moldanubian zone in Pardubice and Vysočina regions. The methods used involve the integration of structural mapping, microstructural analysis, stratigraphic and sedimentological analysis, and in particular the anisotropy of magnetic susceptibility (AMS) accompanied by an examination of magnetic mineralogy using...
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