The Moldanubian Thrust Zone — A terrane boundary in the Central European Variscides refined based on lithostratigraphy and U–Pb zircon geochronology

Jastrzębski, Mirosław; Żelaźniewicz, Andrzej; Murtezi, Mentor; Ларионов, А. Н.; Сергеев, С. А.

doi:10.1016/j.lithos.2015.01.023

Cited by 16 publications

(16 citation statements)

References 64 publications

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“…Wojciechowska, 1972; Wojciechowska, Ziółkowska-Kozdrój & Gunia, 2001; Murtezi, 2006) with ~490–500 Ma protolith ages (e.g. Murtezi & Fanning, 2005; Jastrzębski et al 2015; Mazur et al 2015). A local input of felsic volcanogenic material into the light quartzites in the Stronie Basin (Fig.…”

Section: Discussionmentioning

confidence: 99%

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Cambro-Ordovician vs Devono-Carboniferous geodynamic evolution of the Bohemian Massif: evidence from P–T–t studies in the Orlica–Śnieżnik Dome, SW Poland

2017

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The pressure–temperature–deformation–time (P–T–d–t) record of metagranitic rocks and adjacent diverse rocks of the metavolcano-sedimentary group from the Orlica–Śnieżnik Dome (OSD) in SW Poland is examined. The study aims to better understand the course of the break-up of northern Gondwana and the overprinting Variscan tectonometamorphism in the NE Bohemian Massif. We test the existing hypotheses that explain the Cambro-Ordovician thermal event recorded in the meta-supracrustal group by (i) syn-deformational regional metamorphism or (ii) the contact metamorphism of the (meta)sedimentary rocks around the intruding ~490–500 Ma granitic magmas. In addition, we check the extent and timing of the Variscan prograde and retrograde medium-pressure metamorphism in the OSD. The results imply that Early Palaeozoic monazites, rarely preserved in both rock groups, document ~490–500 Ma volcanic and plutonic events related to the Gondwana's break-up and following disturbance of the Th–U–Pb system during younger, Variscan events. The monazite geochronology reveals no distinct Cambro-Ordovician thermal aureole around the post-granitic orthogneisses. However, no large-scale Variscan juxtaposition is evident between the two main OSD rock groups or within the meta-supracrustal rocks. Consistent P–T–d–t results for the meta-supracrustal rocks and the orthogneisses suggest that their precursors contacted before the Variscan tectonometamorphism. The directly contiguous ortho- and paragneisses together experienced tectonometamorphic processes at maximum depths that correspond to 7.5–8.0 kbar and maximum temperatures of ~600–620°C, as a result of the Variscan collision of Gondwana and Euramerica. The continental collision-related events intensified at ~360 Ma and ~330–340 Ma.

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Section: Discussionmentioning

confidence: 99%

“…to Early Ordovician (e.g. Gunia, 1990; Jastrzębski et al 2010; Mazur et al 2012), with precise U–Pb zircon constraints for Late Cambrian / Early Ordovician volcanic activity registered in the Stronie Formation (~500 Ma; Murtezi & Fanning, 2005; Jastrzębski et al 2015; Mazur et al 2015).…”

Section: Geological Setting and Previous Studiesmentioning

confidence: 99%

Cambro-Ordovician vs Devono-Carboniferous geodynamic evolution of the Bohemian Massif: evidence from P–T–t studies in the Orlica–Śnieżnik Dome, SW Poland

2017

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“…1A). In the east, the OSD bor ders the struc tur ally lower Staré Mìsto Belt and Brunovistulian (Brunia) Terrane (e.g., Schulmann and Gayer, 2000;Don et al, 2003;Mazur et al, 2006;Jastrzêbski et al, 2015b;Fig. 1B).…”

Section: Geological Setting and Previous Studiesmentioning

confidence: 99%

Monazite Th-U-total Pb geochronology and P-T thermodynamic modelling in a revision of the HP-HT metamorphic record in granulites from Stary Gierałtów (NE Orlica-Śnieżnik Dome, SW Poland)

Budzyń

Jastrzębski

Kozub‐Budzyń

et al. 2015

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1 In sti tute of Geo log i cal Sci ences, Pol ish Acad emy of Sci ences, Re search Cen tre in Kraków, Senacka 1, 31-002 Kraków, Po land 2 In sti tute of Geo log i cal Sci ences, Pol ish Acad emy of Sci ences, Re search Cen tre in Wroc³aw, Podwale 75, 50-449 Wroc³aw, Po land 3 AGH Uni ver sity of Sci ence and Tech nol ogy, Fac ulty of Ge ol ogy, Geo phys ics and En vi ron men tal Pro tec tion, al. A. Mickiewicza 30, 30-059 Krakow, Po land 4 Geo log i cal In sti tute of Dionýz Štúr, Mlynská dol ina 1, SK-81704 Bratislava, Slo vak Re pub lic Budzyñ, B., Jastrzêbski, M., Kozub-Budzyñ, G.A., Koneèný, P., 2015. Monazite Th-U-to tal Pb geo chron ol ogy and P-T thermo dy namic mod el ling in a re vi sion of the HP-HT meta mor phic re cord in granu lites from Stary Giera³tów (NE Orlica-OEnie¿nik Dome, SW Po land). Geo log i cal Quar terly, 59 (4): 700-717, doi: 10.7306/gq.1232Ther mo dy namic mod el ling, geothermometric cal cu la tions and monazite Th-U-to tal Pb dat ing via elec tron microprobe anal ysis were used to im prove the pres sure, tem per a ture and tim ing con straints of the HP-HT meta mor phic re cord in granu lites from Stary Giera³tów (NE Orlica-OEnie¿nik Dome, SW Po land). The new data con strained the P-T con di tions to 20-22 kbar and ca. 900-920°C, fol lowed by de com pres sion to ca. 16-18 kbar in the fel sic-to-in ter me di ate granu lites and 18-20 kbar and ca. 950-970°C in the mafic granulite. The lat ter con di tions are con sid ered to closely rep re sent the peak tem per a tures ex pe ri enced by these rocks. In the in ter me di ate granulite, the ma trix monazite and monazite in clu sions in gar net and al la nite yielded an age of 349 ± 2.5 Ma. A HP-HT meta mor phic event with tem per a ture con di tions ex ceed ing 900°C, which are greater than the clo sure tem per a tures of most geochronometers, must have dis turbed and com pletely re set the iso to pic systems, in clud ing the Th-U-Pb sys tem in the monazite. Con se quently, this re set ting pre vented us from con strain ing the age of po ten tial ear lier meta mor phic events or the ig ne ous protolith. The 349 ± 2.5 Ma age is in ter preted as the tim ing of the late-stage HP-HT event and cool ing be low 900°C re lated to the ini tial ex hu ma tion of the granu lites. A com par i son of the new P-T-t con straints with pre vi ous data from the NE Orlica-OEnie¿nik Dome in di cates that the ac ti va tion of the chan nels that exhumed the HP rocks to mid dle crustal depths most likely ini ti ated at ca. 349 Ma, and that all of the meta mor phic rocks in the Orlica-OEnie¿nik Dome likely shared a com mon Variscan evo lu tion af ter ca. 340 Ma.

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“…The metamorphic rocks of the Moldanubian Zone are intruded by numerous ultrapotassic melasyenitoids/melagranitoids (so-called durbachites) aged ~ 343-335 Ma and Moldanubian Batholith granitoid bodies dated to Serpukhovian (331-323 Ma) Friedl et al (1996) vide Franke (2000). Detailed descriptions of the geology of the Bohemian Massif can be found in articles by Dörr et al (2002), Finger et al (2007), Janoušek and Holub (2007), Pertoldová et al (2010), Žák et al (2014) and Jastrzębski et al (2015).…”

Section: Geological Settingmentioning

confidence: 99%

Detrital zircon provenance of Carboniferous sandstones of the Variscan Externides (SW Poland) – record of the eastern Variscides exhumation

Zagórska

Kowalska

Sláma

et al. 2020

Int J Earth Sci (Geol Rundsch)

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The Variscan Externides in the area of southwestern Poland (the basement of the Fore-Sudetic Monocline), are considered an extension of the Rheno-Hercynian Zone of the Variscan Orogen. The Externides are made of Carboniferous siliciclastic sediments, the exact stratigraphic age and provenance of which are not known in detail. To constrain the sedimentary evolution and detritus provenance of the Variscan external belt, eight sandstone samples from boreholes located in the area of SW Poland were selected for petrography, whole rock geochemistry and detrital zircon U-Pb dating. The results show abrupt change in detrital zircon U-Pb provenance, between strata that have been classified as Mississippian (L. Carboniferous) and Pennsylvanian (U. Carboniferous) based on previously published miospore zonation. The Pennsylvanian rocks (from the boreholes of Września-IG1 and Siciny IG1) bear a significant population of zircon grains with Lower Carboniferous ages (350-330 Ma), while such a zircon population is absent in Lower Carboniferous rocks (from the boreholes of Paproć-29 and Kobylin 1). The absence of Moscovian to Asselian zircons that are otherwise known from the adjacent areas with zirconbearing volcanic activity, suggests that the studied Pennsylvanian sediments represent the lower part of Upper Carboniferous. The presented data indicate abrupt provenance change that occurred in the source areas at the Mississippian-Pennsylvanian turn, and that was probably caused by changes in the tectonic architecture of the Variscan Orogen. This tectonic changeover resulted in exhumation and erosion of the Lower Carboniferous rock complexes and manifested itself by recycling of the Lower Carboniferous zircon into Upper Carboniferous strata.

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The Moldanubian Thrust Zone — A terrane boundary in the Central European Variscides refined based on lithostratigraphy and U–Pb zircon geochronology

Cited by 16 publications

References 64 publications

Cambro-Ordovician vs Devono-Carboniferous geodynamic evolution of the Bohemian Massif: evidence from P–T–t studies in the Orlica–Śnieżnik Dome, SW Poland

Cambro-Ordovician vs Devono-Carboniferous geodynamic evolution of the Bohemian Massif: evidence from P–T–t studies in the Orlica–Śnieżnik Dome, SW Poland

Monazite Th-U-total Pb geochronology and P-T thermodynamic modelling in a revision of the HP-HT metamorphic record in granulites from Stary Gierałtów (NE Orlica-Śnieżnik Dome, SW Poland)

Detrital zircon provenance of Carboniferous sandstones of the Variscan Externides (SW Poland) – record of the eastern Variscides exhumation

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