Fig. 5: Thermal and isostatic states of the region.
a Average of Vp/Vs ratios for the crust (at 20 km and 40 km depths) and Vp/Vs ratios for the depth of 100 km (modified from refs. 49,50). Variations higher than the average continental crust (ref. 42 and references therein) are shown as a contour map (green lines). b Crustal thickness vs. topography variations. The selected area (dashed yellow line) in (a) indicates high-resolution crustal Vp/Vs observations42,78 also shown as rectangular symbols in (b). The letter A stands for the Armenian volcanic highland with relatively thin crustal thickness (gray dashed line) and is interpreted as concerning partially melted lower crustal features42. (See Fig. 1 further symbols and boundaries). CC Cratonic Continent, DUC Dynamically Uplifted Continent, ORB Old Rifted Basin, ORO Orogens, SRFB Subducted-Related Foreland/Forearc Basin, TEC Thermally Eroded Continent, YRF Young Rifted Basin51, TGA Turkish-Georgian-Armenian plateau.
