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Post-Variscan metamorphism in the Apuseni and Rodna Mountains (Romania): evidence from Sm–Nd garnet and U–Th–Pb monazite dating

  • Martin Kaspar Reiser
  • Gavril Săbău
  • Elena Negulescu
  • Ralf Schuster
  • Peter Tropper
  • Bernhard Fügenschuh
Article
  • 49 Downloads

Abstract

The Tisza and Dacia mega-units constitute a central part of the Alps-Carpathians-Dinarides orogenic system. Polyphase medium-grade metamorphism observed in mineral assemblages from the crystalline basement is often correlated with Variscan and pre-Variscan events. However, a mid-Cretaceous Sm–Nd garnet age (103.6 ± 1.8 Ma) from the Apuseni Mountains is at odds with this interpretation. Electron-microprobe U-Th–Pb dating of monazite in samples from the Apuseni Mountains, the Rodna Mountains, as well as the Şimleu Silvaniei, Ticău and Preluca inselbergs revealed a complex pattern of Alpine and pre-Alpine age clusters. Pre-Variscan and Variscan ages were obtained from the core of zoned monazite grains and from samples that apparently escaped Alpine overprinting. Relic monazite in the latter is often replaced by rhabdophane and/or surrounded by allanite coronas. Permian to Early Triassic monazite ages correlate with the intrusion of granitic melts and pegmatites. Early Cretaceous ages from rims of chemically zoned grains and from monazite inclusions in garnet, biotite and staurolite represent newly formed metamorphic grains that crystallized on the prograde path during Alpine metamorphism. Petrographic observations of prograde allanite breakdown reactions, Sm–Nd garnet analyses and thermobaric estimates (500–550 °C/5–8 kbar) from parts of the Tisza and Dacia mega-units constrain medium-grade conditions during Early Cretaceous times. Exclusively mid-Cretaceous monazite ages from the inselbergs and the Rebra-Unit of the Rodna Mountains, allow extending the Alpine prograde overprint across the Transylvanian basin. Together with other studies from the basement of the Pannonian basin, this implies that the Dacia Mega-Unit and parts of the Tisza Mega-Unit experienced a medium-grade metamorphic overprint and synkinematic garnet-growth during late Early Cretaceous times. The Alpine prograde medium-grade overprint is pronounced in the contact zone between the Tisza and Dacia mega-units and forms a continuous belt with the Cretaceous metamorphic imprint in the Eastern Alps, when back-rotated to its original position during the Cretaceous.

Keywords

Medium-grade metamorphism Tisza Dacia Cretaceous Transylvania 

Notes

Acknowledgements

We thank Martina Tribus and Thomas Theye for helping with the microprobe analyses, Stanislaw Grabala and Andrea Eberhöfer for help with the mineral separation and Monika Horschinegg and Wencke Wegner for chemical preparation and isotope measurements. Financial support by the Austrian Science Fund (FWF) in the frame of project I138-N19, granted to Bernhard Fügenschuh and the Romanian Executive Unit for Financing Research and Higher Education (UEFISCDI), project PN-II-ID-PCE-2011-3-0030, granted to Gavril Săbău are gratefully acknowledged. We would like to thank Vladica Cvetković, S.M. Schmid, F. Finger and an anonymous reviewer for careful reading and constructive comments that significantly improved the manuscript.

Supplementary material

15_2018_322_MOESM1_ESM.pdf (208 kb)
Online Resource 1: Detailed description of samples and methodology for U-Th-Pb measurement of monazite, thermobarometry and sample preparation for Sm-Nd garnet analyses (PDF 207 kb)
15_2018_322_MOESM2_ESM.pdf (243 kb)
Online Resource 2: Sm-Nd isotopic data on whole rock and garnet analyses. Analytical techniques are described in Online Resource 1. Bold ages are calculated from two or three garnet fractions and whole rock data. Ages marked with an asterisk are calculated based on individual Grt-batches (two-point isochrons). Errors on the 147Sm/144Nd ratio are ±1% (PDF 242 kb)
15_2018_322_MOESM3_ESM.pdf (100 kb)
Online Resource 3: Representative microprobe analyses of a) garnet (basis of formula calculation 12 oxygens); b) feldspar (basis of formula calculation 8 oxygens); c) muscovite (basis of formula calculation 22 oxygens) and d) biotite (basis of formula calculation 22 oxygens) (PDF 99 kb)
15_2018_322_MOESM4_ESM.pdf (6.4 mb)
Online Resource 4: Mg, Mn, Ca and Fe element distribution in garnet from a) the Vidolm Nappe (MR103); b) the Baia de Arieş Nappe (MR142) and c) the Bihor Unit (MR113) (PDF 6541 kb)
15_2018_322_MOESM5_ESM.pdf (787 kb)
Online Resource 5: Summary of microprobe analyses of monazite. Data marked in red are outside of the 1.5% tolerance level and have to be considered with caution (PDF 786 kb)
15_2018_322_MOESM6_ESM.pdf (729 kb)
Online Resource 6: Probability distribution plots, pooled clusters and deconvolved components of the summed probability function, centred on the averages of the pooled clusters. Insets represent an enlargement of the lower part of the graph showing the deconvolution residuals of the probability distribution plot for the analysed sample. The overall probability distribution and its deconvolved components appear truncated in the upper part of the graph. Full deconvolution of the probability distribution plot starting from the probability distribution in the selected age clusters. Inset displays a vertically-enlarged view showing the residuals of the fit. Deconvolution was not attempted in case of few analytical data (e.g. samples 12BrBA and 16MR2) (PDF 729 kb)

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© Swiss Geological Society 2018

Authors and Affiliations

  1. 1.Institut für Geologie, Universität InnsbruckInnsbruckAustria
  2. 2.Geological Institute of RomaniaBucharestRomania
  3. 3.Geologische BundesanstaltViennaAustria
  4. 4.Institut für Mineralogie und PetrographieUniversität InnsbruckInnsbruckAustria

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