Tectonic significance of changes in post-subduction Pliocene-Quaternary magmatism in the south east part of the Carpathian-Pannonian Region

Ioan Seghedi, Liviu Maţenco, Hilary Downes, Paul R D Mason, Alexandru Szakács, Zoltán Pécskay

Research output: Contribution to journalArticle

57 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)146-157
Number of pages12
JournalTectonophysics
Volume502
Issue number1-2
DOIs
Publication statusPublished - Apr 13 2011

Fingerprint

adakite
magma
magmatism
tectonics
volcanism
Pliocene
subduction
geodynamics
slab
slabs
platforms
time measurement
mantle process
strain partitioning
inversion tectonics
petrology
indentation
microplate
geochemistry
magma chamber

Keywords

  • Adakite magmas
  • Alkalic magmas
  • Post-collisional magmatism
  • Slab mechanics

ASJC Scopus subject areas

  • Earth-Surface Processes
  • Geophysics

Cite this

Tectonic significance of changes in post-subduction Pliocene-Quaternary magmatism in the south east part of the Carpathian-Pannonian Region. / Seghedi, Ioan; Maţenco, Liviu; Downes, Hilary; Mason, Paul R D; Szakács, Alexandru; Pécskay, Zoltán.

In: Tectonophysics, Vol. 502, No. 1-2, 13.04.2011, p. 146-157.

Research output: Contribution to journalArticle

Seghedi, Ioan ; Maţenco, Liviu ; Downes, Hilary ; Mason, Paul R D ; Szakács, Alexandru ; Pécskay, Zoltán. / Tectonic significance of changes in post-subduction Pliocene-Quaternary magmatism in the south east part of the Carpathian-Pannonian Region. In: Tectonophysics. 2011 ; Vol. 502, No. 1-2. pp. 146-157.
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