Naslov
Crustal structure and Moho depth in the area of Dinarides and SW Pannonian basin

Autori
Jasna Orešković, Franjo Šumanovac, Saša Kolar

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Abstracts Book - XXI International Congress of the CBGA / - , 2018

Skup
XXI International Congress of the Carpathian Balkan Geological Association

Mjesto i datum
Salzburg, Austrija, 10.09.2018. - 13.09.2018

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Crustal structure, Dinarides, Pannonian Basin

Sažetak
The research was performed in the area of Dinarides and southwestern Pannonian basin with the aim to determine the crustal structure and Moho depths in the entire area. The Dinarides are located at the contact of the Adriatic microplate and southern part of European plate. Collision zone between them encompasses several different tectonic units. Accordingly, the crustal structure in this area is very complex. Deeper, mantle relationships are determined through recent teleseismic tomography investigations and fast velocity anomaly beneath Dinarides has been discovered which points to the Adriatic lithosphere slab steeply sinking in the asthenosphere (Šumanovac et al., 2017). But crustal structure for entire area is not resolved yet, although there are some 2D-models. The crustal characteristics are defined by different sets of geophysical data. The basic data are results of receiver functions (RF) analysis and 1D forward modelling of RF at about 40 seismic stations located in the research area. Those results are compiled with available models from active source seismic project ALP2002 along several profiles extending across this area and with gravity models (Šumanovac, 2010). The receiver functions are mainly used to map the velocity discontinuities. The Moho can be usually easy identified, but forward modelling enabled also determination of discontinuities in the crust and sedimentary basement, namely the crustal structure. The Moho depths obtained by RF method are compared with the depths from other methods and existing Moho maps which partly cover the research area. Receiver functions analysis at the stations in the Dinarides shows thickening of the crust and Moho depths are 10-15% greater than obtained by other geophysical methods (gravity and active seismic prospecting). In the Pannonian basin the Moho depths are about 25 km, which are similar to results of other data. In the transitional zone from the Dinarides to Pannonian basin which is a suture zone between Eurasia and Africa the crustal thickness is like in the pannonian part but the structure is more complex. The reason for that are ophiolite zones (Dinaridic and Sava zones). Based on different datasets high- resolution Moho depth map and model of the crustal structure in this area is constructed. The final Moho topography is average of the Moho as result of gravity modelling and active seismic data and the one obtained by receiver functions analysis. REFERENCES Šumanovac, F. 2010. Lithosphere structure at the contact of the Adriatic microplate and the Pannonian segment based on the gravity modelling. Tectonophysics 485, 94-106. Šumanovac, F., Markušić, S., Engelsfeld, T., Jurković, K., Orešković, J. 2017. Shallow and deep lithosphere slabs beneath the Dinarides from teleseismic tomography as the result of the Adriatic lithosphere downwelling. Tectonophysics 712-713, 523-541.

Izvorni jezik
Engleski

Znanstvena područja
Geologija, Rudarstvo, nafta i geološko inženjerstvo

POVEZANOST RADA