Automatic 1D integrated geophysical modelling of lithospheric discontinuities: a case study from Carpathian-Pannonian Basin region

Abstract

Using a very fast 1D method of integrated geophysical modelling, we calculated models of the Moho discontinuity and the lithosphere-asthenosphere boundary in the Carpathian-Pannonian Basin region and its surrounding tectonic units. This method is capable to constrain complicated lithospheric structures by using joint interpretation of different geophysical data sets (geoid and topography) at the same time. The Moho depth map shows significant crustal thickness variations. The thickest crust is found underneath the Carpathian arc and its immediate Foredeep. High values are found in the Eastern Carpathians and Vrancea area (44 km). The thickest crust modelled in the Southern Carpathians is 42 km. The Dinarides crust is characterized by thicknesses more than 40 km. In the East European Platform, crust has a thickness of about 34 km. In the Apuseni Mountains, the depth of the Moho is about 36 km. The Pannonian Basin and the Moesian Platform have thinner crust than the surrounding areas. Here the crustal thicknesses are less than 30 km on average. The thinnest crust can be found in the SE part of the Pannonian Basin near the contact with the Southern Carpathians where it is only 26 km. The thickest lithosphere is placed in the East European Platform, Eastern Carpathians and Southern Carpathians. The East European Platform lithosphere thickness is on average more than 120 km. A strip of thicker lithosphere follows the Eastern Carpathians and its Foredeep, where the values reach in average 160 km. A lithosphere thickness minimum can be observed at the southern border of the Southern Carpathians and in the SE part of the Pannonian Basin. Here, it is only 60 km. The extremely low values of lithospheric thickness in this area were not shown before. The Moesian Platform is characterized by an E-W trend of lithospheric thickness decrease. In the East, Grinč M. et al.: Automatic 1D integrated geophysical modelling . . . (115)(116)(117)(118)(119)(120)(121)(122)(123)(124)(125)(126)(127)(128)(129)(130)(131) the thickness is about 110 km and in the west it is only 80 km. The Pannonian Basin lithospheric thickness ranges from 80 to 100 km.

Mantle Flow and Determining Position of LAB Assuming Isostasy

“…where q w = 0 is used for the land (i.e., if E [ 0). For the simplified model of the lithosphere presented above, the geoid anomaly N (m) is given by (Fullea et al 2006;Grinc et al 2014)…”

“…However, verification of this assumption is often not possible (see Fig. 2a and Fullea et al 2006;Grinc et al 2014;Krysinski et al 2013Krysinski et al , 2015Czechowski 2018). 2.…”

“…(2), gravitational anomalies resulting from the mass below the asthenosphere should be removed. It is often assumed that all long- wavelength components of gravity variations result from deep sources (see Grinc et al 2014). However, this assumption may not be correct in some regions (as the wavelength of gravitational anomalies depend on the shape of the source mass in addition to its depth; see Fig.…”

Deep geothermal sources for electricity production in Slovakia: thermal conditions

“…We constructed the starting geothermal models using these methods. Similarly to the paper (Majcin et al, 2016) these models were supplemented by existing results of the geothermal modelling made for the studied region both for steady state (Čermák and Bodri, 1986;Bielik et al, 1991;Majcin, 1993) and transient thermal regimes (Kutas et al, 1989;Majcin and Tsvyashchenko, 1994;Majcin et al, 1998;Tarasov et al, 2005;Majcin et al, 2014;Kutas, 2014;Majcin et al, 2015) approaches and by so-called integrated modelling approaches (Zeyen et al, 2002;Dérerová et al, 2006Dérerová et al, , 2012Dérerová et al, , 2014Bielik et al, 2010;Grinč et al, 2014;Hlavňová et al, 2015).…”

Determination of the Lithosphere-Asthenosphere Boundary using program LABWA2015

“…It uses the 'classical' method of determination of LAB based on isostasy -e.g. Krysiński et al (2013Krysiński et al ( , 2015, Grinc et al. (2014).…”