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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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          Author and article information

          Journal
          UCL Open: Environment Preprint
          UCL Press
          19 February 2020
          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.v2

          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: 12/3/2020

          Handling Editor: Dan Osborn

          The article has been accepted and it is suitable for publication in UCL Open: Environment.

          2020-09-23 15:18 UTC
          +1

          Date: 19/2/2020

          Handling Editor: Dan Osborn

          The Article has been revised, this article remains a preprint article and peer-review has not been completed.

          2020-09-23 15:18 UTC
          +1

          This paper has now been Editorially Accepted after review and revision.

          This paper has very much improved and the authors have responded to the reviewer comments in a reasonable way. Perhaps, a few minor points to consider:

           

          • Terminology: this paper covers many years work and it is viewed that the authors use terminology that they are familiar with as modified in light of comments from reviewers, as they have done.
          • Overall the paper is thought to contain important information about a complex area but remain content that the approach taken throughout the paper is familiar to the field.

           

          All previous versions and reviewer comments for this paper can be read openly online at https://dx.doi.org/10.14324/111.444/000024.v1

          2020-03-13 10:18 UTC
          +1

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