Abstract
The occurrence of ultra high pressure (UHP) and high pressure (HP) relicts associated with oceanic material suggests the presence of a suture zone within the Rhodope Massif. Characterisation of the accreted igneous terranes and their relationship with the UHP/eclogite occurrences provide new constraints on the location of this suture. Single-zircon evaporation and sensitive high-resolution ion microprobe dating of orthogneiss protoliths define two groups of intrusion ages: Permo-Carboniferous and Late Jurassic–Early Cretaceous. Structurally, the Late Jurassic gneissic complex overthrust a unit with Permo-Carboniferous orthogneisses. A “melange zone” marked by mylonites, eclogites, amphibolites, and UHP micaschists separates these two units. We interpret these observations in terms of two distinct igneous terranes, the Thracia (Permo-Carboniferous) and Rhodope (Late Jurassic) terranes, separated by the Nestos suture, and assembled during the closure of an oceanic basin of the Tethys. Geochemically, the Late-Jurassic rocks are akin to subduction magmatism, possibly the same subduction that caused the UHP metamorphism of metasediments within the “melange zone”. Observed UHP–HP relicts are restricted to the tectonic contact zone, suggesting that a single subduction/collison event can explain the occurrences of UHP relicts and eclogites in the Central Rhodope, and that subducted rocks are exhumed only within the Nestos suture.
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Acknowledgments
We thank D. Kostopoulos for sharing valuable information on the geology of the Rhodope massif and for showing us the UHP rocks of northern Greece. A.W. Hofmann is thanked for giving access to the facilities of the Geochemistry Department in the Max-Planck-Institut für Chemie, Mainz. We express gratitude to G. Peressini for the numerous discussions and to A. Kühn and J.E. Quick for their valuable comments. J.P. Burg and M. Bröcker are warmly acknowledged for their thorough reviews. P. Turpaud acknowledges P. Gautier for communicating his experience and enthusiasm along a joint field trip. This work was supported by a grant from the Graduiertenkolleg 392 “Stoffbestand und Entwicklung von Kruste und Mantel” funded by the State of Rheinland-Pfalz and the Deutsche Forschungsgemeinschaft.
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Turpaud, P., Reischmann, T. Characterisation of igneous terranes by zircon dating: implications for UHP occurrences and suture identification in the Central Rhodope, northern Greece. Int J Earth Sci (Geol Rundsch) 99, 567–591 (2010). https://doi.org/10.1007/s00531-008-0409-x
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DOI: https://doi.org/10.1007/s00531-008-0409-x