Kinematics of deformation and structural evolution of the Paikon Massif (Central Macedonia, Greece): A Pelagonian tectonic window?
The Paikon Massif is part of the Axios Zone and consists of Triassic marbles intercalated with schists and phyllites, overlain by volcanoclastic and carbonate rocks of Jurassic to Early Cretaceous age, as well as ophiolites. Transgressive Upper Cretaceous limestone and flysch overlie discordantly all the above mentioned units of the Paikon Massif. Polyphase deformation and metamorphism affected all Paikon units. We distinguish six main deformational events (D1-D6). Deformation started in the Middle to Late Jurassic during subduction, but no structures were preserved from this stage (D0). Ophiolite obduction and the tectonic emplacement of the volcanoclastic series of the Paikon Massif took place during the Late Jurassic and D1 event. Top-W movement occurred mainly during D1. Syn-D1 metamorphism did not exceed greenschist facies conditions (M1). D1 affects the Triassic units of the Paikon Massif and the overlying volcanoclastic series. A HP-LT metamorphism (M0) recognized in the lower tectonic units of the Paikon Massif predates the D1 event and is possibly related to subduction and collision. Compressional tectonics and intense thrusting with a southwestward sense of movement continued in Lower Cretaceous time, affecting all pre-Upper Cretaceous units and the obducted ophiolites (D2). D2 is associated with a M2 metamorphism in low grade greenschist facies conditions. A possible extensional event before D2 may be related to the deposition of the Upper Jurassic-Lower Cretaceous carbonate sediments. During the Late Cretaceous, basin formation and sedimentation of the Upper Cretaceous shallow-water limestone and flysch are probably linked to extension (D3). During the Paleocene to Eocene, intense imbrication of all tectonic units towards SW takes place again (D4). In the western Paikon, during D4, the obducted ophiolites were thrust back towards NE over the Upper Cretaceous limestones and flysch. Extensional collapse and exhumation took place during Oligocene to Miocene, associated with brittle low-angle normal faults, with a main top-to-the-SW sense of movement (D5). Top-NE movement also occurred during D5. In Miocene to Recent times, brittle high-angle normal and strike-slip faults are formed in an extensional to transtensional strain regime (D6), associated with Neogene to Quaternary basin formation. The Paikon Massif is regarded as a multiple tectonic window, probably of Pelagonian origin.
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Document Type: Research Article
Publication date: 2013-08-01
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