Geochronology, petrogenesis and geodynamic significance of the Visean igneous rocks in the Central Sudetes, northeastern Bohemian Massif

Jastrzębski, Mirosław; Machowiak, Katarzyna; Krzemińska, Ewa; Farmer, G. Lang; Ларионов, А. Н.; Murtezi, Mentor; Majka, Jarosław; Сергеев, С. А.; Ripley, Edward M.; Whitehouse, Martin J.

doi:10.1016/j.lithos.2018.07.034

Cited by 13 publications

(11 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Sam ple GJ117 co mes from the vein which is par al lel to the old est fo li a tion and the age ob tained from this sam ple (351 ±1.3 Ma) cor re lates well with the Pb-Pb zir con evap o ra tion age of 353 ±1 Ma pro vided by Skrzypek et al (2014) from the same rock va ri ety. It is also in a good agreement with the U-Pb zir con age from sam ple OS399 re ported by Jastrzêbski et al (2018), which was dis carded by the au thors as be ing 12 My older than the ages from the rest of their sam ples.…”

Section: Discussionsupporting

confidence: 76%

“…The MG geo chem i cal fea tures sug gest that they are de rived from a more fel sic source. Low ini tial e Nd val ues, and high ini tial 87 Sr/ 86 Sr for the Jawornik granitoids shown by Jastrzêbski et al (2018) were in ter preted by these au thors as in di ca tors of their or i gin by par tial melt ing of the lower crust, which is con sis tent with the above ob ser va tions.…”

Section: Discussionsupporting

confidence: 53%

“…Pre vi ously pub lished geo chron ol ogi cal data al low dis tinction of three groups of Pb/Pb and U/Pb zir con ages for the Jawornik granitoids: ~351 ±3 -351 ±1 Ma for am phi bole-and bi o tite-bear ing granodiorites (HBG) (Bia³ek, 2014;Skrzypek et al, 2014), 342 ±4 Ma for bi o tite-and mus co vite-bear ing granodiorites (BMG) (Bia³ek, 2014) and 333 ±4 Ma for gran ite and granodiorite (Závada et al, 2017;Jastrzêbski et al, 2018). Monazite in the bi o tite-bear ing granodiorite (BG) pro vided a Th-U-to tal Pb age of 343 ±4 Ma (Budzyñ and Jastrzêbski, 2016).…”

Section: Previous Studies On the Jawornik Granitoidsmentioning

confidence: 99%

“…The larg est Sudetic plutons -the Karkonosze Pluton, Strzegom-Sobótka Mas sif, Žulowá Pluton, and small in tru sions that crop out in the Strzelin Mas sif, emplaced on the pe riph ery of the Variscan orogen, can be classi fied as late-to post-tec tonic (Oberc-Dziedzic and Kryza, 2012;Kryza et al, 2014;Laurent et al, 2014;Turniak et al, 2014). Older and smaller granitoids of the cen tral Sudetes are spa tially and tem po rally re lated to shear-or fault-zones (Parry et al, 1997;Pietranik et al, 2013;Oberc-Dziedzic et al, 2015;Jastrzêbski et al, 2018;Jokubauskas et al, 2018). These defor ma tion zones -like the Niemcza Shear Zone or the Staré Mìsto Belt -are the re sults of oblique col li sion of Teplá-Barrandian, Moldanubicum and Brunovistulicum dur ing the Early to Late Car bon if er ous (Matte et al, 1990;Schulmann and Gayer, 2000).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Geochemistry and geochronology of the Jawornik granitoids, Orlica-Śnieżnik Dome, Sudetes, Poland

Białek

2020

View full text Add to dashboard Cite

The Jawornik granitoids intrude, in vein-like form, a sequence of a polymetamorphic metavolcanic and metapelitic rocks of the Orlica-Śnieżnik Dome, Sudetes, Poland. This paper provides whole-rock geochemical data, sensitive high-resolution ion microprobe (SHRIMP) U-Pb zircon geochronological data as well as 40Ar-39Ar age determinations to constrain the genetic and temporal relationships of the different rock types forming these veins. Based on macroscopically visible features of the granitoids and their relationship with tectonic structures visible in the country rocks, four varieties of the Jawornik granitoids have been distinguished: amphibole- and biotite-bearing granites (HBG), biotite-bearing granites (BG), biotite- and muscovite-bearing granites (BMG) and muscovite-bearing granites (MG). The Jawornik granitoids as a whole show a limited but significant variation in major element chemical composition, with SiO2 ranging from 65 to 76 wt.% (average 69.16 wt.%, n = 24). They are subalkalic, peraluminous and calc-alkaline [average A/CNK = 1.07, average (Na2O + K2O) = 7.75, average (Fe2O3t/(Fe2O3t + MgO) = 0.59]. Close inspection of their geochemical parameters showed that the samples investigated can be subdivided into two groups. The first group, the HBG, BG, and BMG varieties, comprising most of the granitoids in the Złoty Stok-Skrzynka Tectonic Zone, were formed by melting of greywackes or/and amphibolites. The MG, belonging to the second group, were formed by partial melting of a more felsic source. The HBG yielded a zircon U-Pb age of 351 ±1.3 Ma and well-defined 40Ar-39Ar plateau ages for hornblende (351.1 ±3.9 Ma) and coexisting biotite (349.6 ±3.8 Ma), indicating probably the oldest magmatic event in this region. Zircons from the MG, the youngest rock variety on the basis of their relationship with the tectonic structures in the host rocks, yielded a U-Pb age of 336.3 ±2.4 Ma, though based on three points only. The biotites and muscovites from the BMG have 40Ar-39Ar plateau ages of 344.1 ±4.7 Ma and 344.6 ±3.8 Ma, respectively. These data, in combination with already published isotopic ages, suggest that the Jawornik granitoids intruded host rocks of the Orlica-Śnieżnik Dome in three stages, at ~350, ~344 and ~335 Ma.

show abstract

Section: Discussionsupporting

confidence: 76%

Section: Discussionsupporting

confidence: 53%

Section: Previous Studies On the Jawornik Granitoidsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Geochemistry and geochronology of the Jawornik granitoids, Orlica-Śnieżnik Dome, Sudetes, Poland

Białek

2020

View full text Add to dashboard Cite

show abstract

“…Proterozoic and late Archean peaks (i.e.,~1,500, 2,000, and 2,700 Ma) found in the eastern Moldavides nappes are characteristic for the foreland units of the Carpathian orogen: the East European platform basement (Figure 3h), the East European Neoproterozoic sedimentary cover (Figure 3i), the Moesian platform (Figure 3f), and North Dobrogea (Figure 3e). The igneous and metamorphic Carboniferous peaks of 320 -340 Ma (Figures 10a, 10b, 10c, 10d, 10e, and 10h) are rare among the studied basement of the Carpathians and foreland units of Romania (Ducea et al, 2018) but are characteristic for some other areas of the mobile Paleozoic Europe, such as the igneous rocks from the Bohemian Massif (Jastrzębski et al, 2018), among several others. This interval, broadly referred to as Variscan, is when major Barrovian collisional metamorphim took place in the Dacia mega-unit and contains only limited, low temperature leucogranitic magmatism (Balintoni et al, 2014).…”

Section: 1029/2019tc005780mentioning

confidence: 96%

Lower Cretaceous Provenance and Sedimentary Deposition in the Eastern Carpathians: Inferences for the Evolution of the Subducted Oceanic Domain and its European Passive Continental Margin

et al. 2020

View full text Add to dashboard Cite

Reconstructing orogenic systems made up dominantly by sediments accreted in trenches is challenging because of the incomplete lithological record of the subducted oceanic domain and its attached passive continental margin thrusted by collisional processes. In this respect, the remarkable ~600 km long continuity of sediments exposed in the Eastern Carpathian thin‐skinned thrust and fold belt and the availability of quantitative reconstructions for adjacent continental units provide excellent conditions for a paleogeographical study by provenance and sedimentological techniques constraining sediment routing and depositional systems. These sediments were deposited in the Ceahlău‐Severin branch of the Alpine Tethys Ocean and over its European passive continental margin. We report sedimentological, paleomagnetic, petrographic, and detrital zircon U‐Pb data of Lower Cretaceous sediments from several thin‐skinned tectonic units presumably deposited in the Moldavides domain of the Eastern Carpathians. Sedimentological observations in the innermost studied unit demonstrate that deposition took place in a deepwater basin floor sheets to sandy turbidite system. Detrital zircon age data demonstrate sourcing from internal Carpathian basement units. The sediment routing changes in more external units, where black shales basin floor sheets to sandy mud turbidites were sourced from an external, European continental area. Although some degree of mixing between sources located on both margins of the ocean occurred, constraining a relatively narrow width of the deep oceanic basin, these results demonstrate that the internal‐most studied unit was deposited near an Early Cretaceous accretionary wedge, located on the opposite internal side relative to the passive continental margin domain of other Moldavides units.

show abstract

Interpretation of wide zircon U–Pb age distributions in durbachite-type Variscan granitoid in the Mórágy Hills

et al. 2023

View full text Add to dashboard Cite

In situ U–Pb analyses were performed on SEM-BSE, SEM-CL and Raman mapped zircons from the Variscan granitoids exposed in the Mórágy pluton, Hungary. However, the routinely used LA-ICP-MS could result only in reliable age constraints if the system was not overprinted by multiple geological processes that affect the isotope system of zircons. To overcome the ambiguities the new zircon U–Pb age data were evaluated carefully, first using simple statistical models, then a zircon internal texture related complex approach was applied. This method demonstrates that the U–Pb age in overprinted systems correlates with the structural state; the worse structural state zones showing younger, but still concordant ages. Individual zircon internal texture and structural state based evaluation made it possible to select the least overprinted age components of the system and identify five steps in the evolution of the studied intrusive rock. The two melts (granitoid and mafic) passed the zircon U–Pb isotope closure temperature ~ 355 ± 3 Ma ago during their cooling. Crystallization of the two mingled magmas overarched the 350–340 Ma period, including two intense zircon crystallization peaks (~ 347 Ma, ~ 333 Ma). The cessation of melt crystallization (~ 650 °C) happened ~ 334 ± 4 Ma ago, as indicated by the age of the “normal and long prismatic” zircons. Further confirming this statement, they are embedding in their rims the eutectic mineral assemblage. A Cretaceous post-magmatic event was identified according to slightly discordant U–Pb ages for the Mórágy pluton.

show abstract

Geochronology, petrogenesis and geodynamic significance of the Visean igneous rocks in the Central Sudetes, northeastern Bohemian Massif

Cited by 13 publications

References 45 publications

Geochemistry and geochronology of the Jawornik granitoids, Orlica-Śnieżnik Dome, Sudetes, Poland

Geochemistry and geochronology of the Jawornik granitoids, Orlica-Śnieżnik Dome, Sudetes, Poland

Lower Cretaceous Provenance and Sedimentary Deposition in the Eastern Carpathians: Inferences for the Evolution of the Subducted Oceanic Domain and its European Passive Continental Margin

Interpretation of wide zircon U–Pb age distributions in durbachite-type Variscan granitoid in the Mórágy Hills

Contact Info

Product

Resources

About