Predictions of our multi-zone chemical evolution model presented in Section 2.1 as a function of the evolutionary time t and the Galacto-centric distance. Left panel: evolution of the total (CC+Type Ia) SN rates. The red and green dashed horizontal lines indicate <R_{S N, ⊙}> (case 1) and 2 × <R_SN,⊙> (case 2) values, respectively, representing the minimum SN rate thresholds tested for SN explosion-induced destruction effects in this study. Right panel : predicted age-metallicity relation. The red-shaded region marks [Fe/H] < -1 dex where, as suggested by Johnson & Li (2012), conditions are considered unfavourable for the formation of terrestrial planets.