Multidimensional Geodynamic Modeling in the Southeast Carpathians: Upper Mantle Flow-Induced Surface Topography Anomalies


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Sengul-Uluocak E., Pysklywec R. N., Göğüş O. H., Ulugergerli E. U.

GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS, cilt.20, sa.7, ss.3134-3149, 2019 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 20 Sayı: 7
  • Basım Tarihi: 2019
  • Doi Numarası: 10.1029/2019gc008277
  • Dergi Adı: GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED)
  • Sayfa Sayıları: ss.3134-3149
  • Anahtar Kelimeler: Southeast Carpathians, three- and two-dimensional numerical modeling, gravity admittance, isostasy, GRAVITATIONAL-INSTABILITY, CONTINENTAL COLLISION, LITHOSPHERIC DEFORMATION, CRUSTAL STRUCTURE, THERMAL STRUCTURE, PANNONIAN REGION, SLAB DETACHMENT, BEND ZONE, HEAT-FLOW, EVOLUTION
  • Çanakkale Onsekiz Mart Üniversitesi Adresli: Evet

Özet

Spectral variations of gravity and topography data show nonisostatic compensation of elevation in the Southeast Carpathians that is consistent with our new residual topography calculations. Multidimensional thermomechanical models are created to consider a possible mantle flow component of the surface topography with varying temperature models and crustal configurations. The temperature anomalies derived from large-scale P wave velocity anomalies and combined temperature model are estimated as input for the parametric numerical modeling experiments. Model results show that a surface uplift (up to similar to 1 km) develops in the southeastern Carpathians due to the rising hot upper mantle beneath the region. The upwelling flow is also in concordance with observations such as volcanism and enhanced surface heat flow in the region. Subsidence in the eastern part (0.5-1 km over the Vrancea zone and the Focsani Basin) forms in relation to the downgoing Vrancea slab. The findings indicate the significant role of upper mantle structures on the present-day anomalous topography related to proposed postcollisional tectonics in the Southeast Carpathians.