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Publication Detail
Tectonic significance of changes in post-subduction Pliocene-Quaternary magmatism in the south east part of the Carpathian-Pannonian Region
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Journal Article
  • Authors:
    Seghedi I, Maţenco L, Downes H, Mason PRD, Szakács A, Pécskay Z
  • Publication date:
    13/04/2011
  • Pagination:
    146, 157
  • Journal:
    Tectonophysics
  • Volume:
    502
  • Issue:
    1-2
  • Status:
    Published
  • Print ISSN:
    0040-1951
Abstract
The south-eastern part of the Carpathian-Pannonian region records the cessation of convergence between the European platform/Moesia and the Tisza-Dacia microplate. Plio-Quaternary magmatic activity in this area, in close proximity to the 'Vrancea zone', shows a shift from normal calc-alkaline to much more diverse compositions (adakite-like calc-alkaline, K-alkalic, mafic Na-alkalic and ultrapotassic), suggesting a significant change in geodynamic processes at approximately 3. Ma. We review the tectonic setting, timing, petrology and geochemistry of the post-collisional volcanism to constrain the role of orogenic building processes such as subduction or collision on melt production and migration. The calc-alkaline volcanism (5.3-3.9. Ma) marks the end of normal subduction-related magmatism along the post-collisional Cǎlimani-Gurghiu-Harghita volcanic chain in front of the European convergent plate margin. At ca. 3. Ma in South Harghita magma compositions changed to adakite-like calc-alkaline and continued until recent times (< 0.03. Ma) interrupted at 1.6-1.2. Ma by generation of Na and K-alkalic magmas, signifying changes in the source and melting mechanism. We attribute the changes in magma composition in front of the Moesian platform to two main geodynamic events: (1) slab-pull and steepening with opening of a tear window (adakite-like calc-alkaline magmas) and (2) renewed contraction associated with deep mantle processes such as slab steepening during post-collisional times (Na and K-alkalic magmas). Contemporaneous post-collisional volcanism at the eastern edge of the Pannonian Basin at 2.6-1.3. Ma was dominated by Na-alkalic and ultrapotassic magmas, suggesting a close relationship with thermal asthenospheric doming and strain partitioning related to the Adriatic indentation. Similar timing, magma chamber processes and volume for K-alkalic (shoshonitic) magmas in the South Apuseni Mountains (1.6. Ma) and South Harghita area at a distance of ca. 200. km imply a regional connection with the inversion tectonics. © 2009 Elsevier B.V.
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