GNGTS 2024 - Atti del 42° Convegno Nazionale

Session 1.3 GNGTS 2024 Fig. 1 – Temperature and velocity (arrows) felds for the three modeled tectonic setngs as predicted by macro-scale geodynamic modeling. (A, B) Rising plume model inital setup and afer 30 Myr. Only half of the computatonal domain ( = 80° - 90°) is shown. The thermal anomaly is delimited by a 2D gaussian surface containing material at 2143 K, resultng in a 200-250 K temperature anomaly over the mantle transiton zone. The 2D gaussian surface is centered at ( ) = (90°, 90°), and has a radial extent of 1°, a horizontal standard deviaton of 0.4° and a maximum amplitude of 100 km. (C) Oceanic spreading ridge model afer 1 Myr. The arrows length at the surface is proportonal to the imposed 2 cm/yr divergence rate. (D, E) Oceanic plate subducton model inital setup and afer 19 Myr. The opaque surfaces enclose material with viscosity ≥ 10 21 Pa s and are colored according to temperature. In (E) the white (dark grey) arrows indicate the poloidal (toroidal) component of the velocity feld. The arrows length in (B) and (E) is downscaled by 10 and 4 tmes with respect to that in (C). ϕ ϕ , θ