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Swiss Journal of Geosciences

, Volume 110, Issue 2, pp 699–719 | Cite as

Magmatic and tectonic history of Jurassic ophiolites and associated granitoids from the South Apuseni Mountains (Romania)

  • Daniela GallhoferEmail author
  • Albrecht von Quadt
  • Stefan M. Schmid
  • Marcel Guillong
  • Irena Peytcheva
  • Ioan Seghedi
Article

Abstract

The Jurassic ophiolites in the South Apuseni Mountains represent remnants of the Neotethys Ocean and belong to the East Vardar ophiolites that contain ophiolite fragments as well as granitoids and volcanics with island-arc affinity. New U–Pb zircon ages, and Sr and Nd isotope ratios give insights into their tectono-magmatic history. The ophiolite lithologies show tholeiitic MOR-type affinities, but are occasionally slightly enriched in Th and U, and depleted in Nb, which indicates that they probably formed in a marginal or back-arc basin. These ophiolites are associated with calc-alkaline granitoids and volcanics, which show trace element signatures characteristic for subduction-enrichment (high LILE, low HFSE). Low 87Sr/86Sr ratios (0.703836–0.704550) and high 143Nd/144Nd ratios (0.512599–0.512616) of the calc-alkaline series overlap with the ratios measured in the ophiolitic rocks (0.703863–0.704303 and 0.512496–0.512673), and hence show no contamination with continental crust. This excludes a collisional to post-collisional origin of the granitoids and is consistent with the previously proposed intra-oceanic island arc setting. The new U–Pb ages of the ophiolite lithologies (158.9–155.9 Ma, Oxfordian to Early Kimmeridgian) and granitoids (158.6–152.9 Ma, latest Oxfordian to Late Kimmeridgian) indicate that the two distinct magmatic series evolved within a narrow time range. It is proposed that the ophiolites and island arc granitoids formed above a long-lived NE-dipping subduction zone. A sudden flip in subduction polarity led to collision between island arc and continental margin, immediately followed by obduction of the ophiolites and granitoids on top of the continental margin of the Dacia Mega-Unit. Since the granitoids lack crustal input, they must have intruded the Apuseni ophiolites before both magmatic sequences were obducted onto the continental margin. The age of the youngest granitoid (~153 Ma, Late Kimmeridgian) yields an estimate for the maximum age of emplacement of the South Apuseni ophiolites and associated granitoids onto the Dacia Mega-Unit.

Keywords

East Vardar ophiolites U–Pb zircon dating LA-ICP-MS Radiogenic Sr–Nd isotopes Obduction onto Dacia Mega-Unit Island arc 

Notes

Acknowledgements

This study was supported by the Swiss National Science Foundation Grants 200020-146681 and 20021-146651 and SNF scopes projects JRP 7BUPJ062396 and IZ73ZO_128089. Douwe van Hinsbergen and Kamil Ustaszewski are thanked for sharing their ideas concerning plate tectonic reconstructions, influencing parts of our Fig. 10. We thank Ramon Aubert, Markus Wälle, Lydia Zehnder and Muhammed Usman for support in the laboratories. We thank Franz Neubauer and Dejan Prelević for careful and helpful reviews.

Supplementary material

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Supplementary material 1 (PDF 1420 kb)
15_2016_231_MOESM2_ESM.xlsx (122 kb)
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Copyright information

© Swiss Geological Society 2016

Authors and Affiliations

  1. 1.Institute of Geochemistry and PetrologyETH ZürichZurichSwitzerland
  2. 2.Institute of GeophysicsETH ZürichZurichSwitzerland
  3. 3.Department of Geochemistry and PetrologyBulgarian Academy of SciencesSofiaBulgaria
  4. 4.Institute of GeodynamicsRomanian AcademyBucharestRomania

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