Abstract
Geological and geophysical data on the structure of Mukachevo and Solotvyno sub-basins of Transcarpathian Basin (TB), located in the hinterland of Outer Carpathians, are integrated and adapted to modern ideas about the Carpathian realm geodynamics. Analysis of published data and newly compiled geological map and cross-sections suggests: the Mukachevo sub-basin substratum can be attributed to the Alcapa terrane, and a significant portion of the Solotvyno sub-basin basement may belong to the Pieniny Klippen Belt. A model of the lithospheric structure, supported by deep seismic (PANnonian-CArpathians-Cratonic Europe or DOBRE-3 transect) PANCAKE and P-17 profiles, and density modelling identify the crustal domain beneath the Mukachevo sub-basin as a rootless fragment of the Alcapa terrane. The substratum of the Solotvyno sub-basin is interpreted as thrust-sheets of the Pieniny Klippen Belt, Czorsztyn continental block, Monastyrets nappe and Tisza–Dacia terrane at their base. Paleostress reconstruction identified four evolutionary phases: (1) opening of the TB as dextral shear pull-apart (earliest Middle Miocene), (2) rapid subsidence of the TB (Badenian), (3) inversion of Solotvyno and slow subsidence in the Mukachevo sub-basins (Sarmatian–Pliocene) and (4) inversion of the TB (Quaternary). The lithosphere of the TB is significantly thermally reworked and is characterized by (1) a thinned crust with zones of reduced velocity and density, (2) astenospheric uplift, (3) absence of residual slab and (4) presence of a reflector in the upper mantle descending under the Carpathians.
Published Version
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