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Migmatization and large-scale folding in the Orlica-Śnieżnik Dome, NE Bohemian Massif : pressure, temperature, time, deformation constraints on Variscan terrane assembly

Migmatization and large-scale folding in the ...

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dc.contributor.author Jastrzębski, Mirosław pl
dc.contributor.author Stawikowski, Wojciech pl
dc.contributor.author Budzyń, Bartosz [SAP13037090] pl
dc.contributor.author Orłowski, Ryszard pl
dc.date.accessioned 2015-04-20T13:40:53Z
dc.date.available 2015-04-20T13:40:53Z
dc.date.issued 2014 pl
dc.identifier.issn 0040-1951 pl
dc.identifier.uri http://ruj.uj.edu.pl/xmlui/handle/item/5313
dc.language eng pl
dc.rights Dodaję tylko opis bibliograficzny *
dc.rights.uri *
dc.title Migmatization and large-scale folding in the Orlica-Śnieżnik Dome, NE Bohemian Massif : pressure, temperature, time, deformation constraints on Variscan terrane assembly pl
dc.type JournalArticle pl
dc.description.physical 54-74 pl
dc.abstract.en New research indicates that there is stratigraphic and structural continuity between the Młynowiec and Stronie Formations of the Orlica-Śnieżnik Dome (OSD), Bohemian Massif, and reveals the primary importance of the collision of Armorican Terrane Assemblage and Brunovistulian terrane in Variscan development of the OSD. The Młynowiec Formation is a locally migmatized metasedimentary unit and understanding its tectonometamorphic history is crucial for making regional-scale Variscan reconstructions. Structural studies, pseudosection modelling in MnNCKFMASH system and microprobe monazite dating revealed that this Variscan collision led to crustal thickening of the OSD, tectonic burial of the Młynowiec Formation to depths corresponding to 10-11 kbar and progression of regional metamorphism at 361 ± 5 Ma. Continuous underthrusting of the Brunovistulian terrane led to exhumation of the OSD metasediments and the formation of subhorizontal, N-S-trending tight folds and a peak-metamorphic axial planar foliation. This episode took place at 650 °C and 6-7 kbar in the non-migmatized rocks of structurally upper parts of the Młynowiec Formation, and at 700 °C and 6-7 kbar in its structurally lower parts, where metamorphism was accompanied by localised in-situ migmatisation. During final consolidation of a mosaic of terranes, top-to-the-NE tectonic movements reactivated former fabrics, produced further uplift and cooled the rocks to greenschist facies. This pervasive shearing could be also responsible for the metasomatic event at ~ 330 Ma. The continuation of the NE-transpression of the OSD involved its interactions with adjacent crustal units in the east and in the north, which led to large-scale folding represented now by synforms and associated antiforms. The metamorphic structure of the rocks subjected to the Barrovian-type metamorphism was rebuilt so that the migmatitic rocks outcrop in the cores of large-scale antiforms, and the lithological contacts, penetrative foliation and metamorphic isograds dip locally at different angles (shallow, moderate to high) and at different azimuths (E-, NE-, N, NW and W). pl
dc.subject.en Variscan belt pl
dc.subject.en Bohemian Massif pl
dc.subject.en Orlica–Śnieżnik Dome pl
dc.subject.en monazite geochronology pl
dc.subject.en migmatization pl
dc.subject.en pseudosection modelling pl
dc.description.volume 630 pl
dc.identifier.doi 10.1016/j.tecto.2014.05.011 pl
dc.identifier.eissn 1879-3266 pl
dc.title.journal Tectonophysics pl
dc.language.container eng pl
dc.affiliation Wydział Biologii i Nauk o Ziemi : Instytut Nauk Geologicznych pl
dc.subtype Article pl
dc.rights.original bez licencji pl
.pointsMNiSW [2014 A]: 35

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