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      Tectono-stratigraphic correlations between Northern Evvoia, Skopelos and Alonnisos, and the postulated collision of the Pelagonian carbonate platform with the Paikon forearc basin (Pelagonian-Vardar zones, Internal Hellenides)

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          Abstract

          The Pelagonian stratigraphy of the study area consists of a Permo-Triassic basement and an Upper Triassic and Jurassic carbonate platform formation that had been overthrust by the Eohellenic ophiolite sheet during the Early Cretaceous. Intensive erosion, during the Cretaceous, removed most of the ophiolite and partly the Jurassic formation. It is hypothesised that uplift and erosion of eastern Pelagonia had been triggered by the break-off of the subducted oceanic leading edge of the Pelagonian plate.

          An investigation of the rocks that succeed the erosional unconformity shows that they constitute a shear-zone-formation which is tectonically overlain by Cretaceous platform carbonates that characterise the Palouki series of Skopelos and Alonnisos. Geochemical analyses of the shear-zone rocks substantiate that they are of mid ocean ridge and island arc provenience.

          Eastern Pelagonia collided with a Cretaceous carbonate platform, probably the Paikon-Paeonian forearc basin, as the Almopias ocean subducted beneath that island-arc-complex. The Cretaceous platform, together with a substrate of sheared-off ocean floor mélange, overthrust eastern Pelagonia as subduction continued, and the substrate was dynamically metamorphosed to cataclastic rocks, mylonite, phyllonite and interpreted pseudotachylite. This complex of Cretaceous platform rocks and a brittle-ductile shear-zone-substrate constitute the here named Paikon-Palouki nappe which was emplaced during Early Palaeocene. The Paikon-Palouki nappe did not reach Evvoia.

          Seismic tomographic models of the Aegean region apparently depict images of two broken-off ocean-plate-slabs, interpreted as Almopias-lithosphere-slabs: the western Almopias slab began to sink during the Early Cretaceous, the eastern Almopias slab broke off and sank after the Paikon-Palouki nappe was emplaced in Early Palaeocene time.

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          Most cited references 4

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          HfNdSr isotopes and incompatible element abundances in island arcs: implications for magma origins and crust-mantle evolution

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            Stratigraphy and tectonics of a time-transgressive ophiolite obduction onto the eastern margin of the Pelagonian platform from Late Bathonian until Valanginian time, exemplified in northern Evvoia, Greece

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              Tectonics

              (2020)
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                Author and article information

                Journal
                UCL Open: Environment Preprint
                UCL Press
                20 October 2019
                Affiliations
                [1 ] Geologische Staatssammlung of the Bayerische Staatssammlung für Palaeontologie und Geologie, Munich, Germany
                [2 ] University College London Office of the Vice-Provost (Research), UCL, UK
                Article
                10.14324/111.444/000024.v1

                This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY) 4.0 https://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, distribution and reproduction in any medium, provided the original author and source are credited.

                All data generated or analysed during this study are included in this published article (and its supplementary information files).

                Geosciences

                Climate, The Environment, Eastern Pelagonia; Paikon collision; ocean floor mélange; shear zone formation; Slab break-off

                Comments

                Decision date: 11/11/2019

                Handling Editor: Dan Osborn

                This article is a preprint article and has not been peer-reviewed. It is under consideration following submission to UCL Open: Environment Preprint for open peer review.

                2020-09-23 15:17 UTC
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