Intraoceanic subduction of the northwestern Neotethys and geodynamic interaction with Serbo-Macedonian foreland: Descending vs. overriding near-trench dynamic constraints (East Vardar Zone, Jastrebac Mts., Serbia)
A composite paleogeographic and plate kinematic spatiotemporal reconstruction of the exhumed Neotethyan cross-lithospheric footwall amalgamation (Jastrebac dome) incorporates the two formerly underplating oceanic entities, West Vardar- and East Vardar Zone. These ophiolite-bearing agglom...
Main Authors: | , |
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Format: | Article |
Language: | English |
Published: |
Faculty of Mining and Geology, Belgrade
2019-01-01
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Series: | Geološki Anali Balkanskoga Poluostrva |
Subjects: | |
Online Access: | http://www.doiserbia.nb.rs/img/doi/0350-0608/2019/0350-06081902065S.pdf |
Summary: | A composite paleogeographic and plate kinematic spatiotemporal reconstruction
of the exhumed Neotethyan cross-lithospheric footwall amalgamation
(Jastrebac dome) incorporates the two formerly underplating oceanic
entities, West Vardar- and East Vardar Zone. These ophiolite-bearing
agglomerations are unroofed within the accretionary Paleogene to Miocene
core-complex, beneath the Serbo-Macedonian overriding plate. The exposed
Neotethyan crustal amalgamation is comprised of: an (i) folded trench
assemblage of uncertain Mesozoic? Paleogeographic affinity metamorphosed
under a greenschist-grade (West- vs. East Vardar Zone or Neotethyan crust-
vs. its back-arc system?) sandwiched beneath the overlying (ii) late
Cretaceous - Paleogene (meta)turbidites. To make matters more intricate, at
the closest proximity of the dome (Mali Jastrebac Mountain) there is a
similar (iii) greenschist-facies amalgamation comprised of the
Neoproterozoic - Lower Paleozoic ocean-floor assembly (Supragetic basement).
The interpretations of this rather controversial cross-lithospheric
structure include a reassessment of the obduction sequence, and are
underpinned by the restoration of the near-trench microplate motions. The
study addresses the (1) local finite configuration (Serbo-Macedonian hanging
wall vs. Neo - tethyan intraoceanic arc) and the (2) spatiotemporal geometry
of the principal (micro)plate boundaries (Serbo-Macedonian Unit vs.
Apulia/Adria). Unlike the earlier proposal of the ophiolite obduction onto
the Serbo-Macedonian Unit onto the Apulia/Adria hinterland (or external
segment of the “Dacia mega-terrane”), we here propose a west-vergent
obduction of the East Vardar Zone ophiolites onto the descending Neotethyan
lithosphere (West Vardar ophiolites) - a similar scenario to its
continuation in Greece (Peonias subzone). |
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ISSN: | 0350-0608 2406-0747 |