Extended Data Fig. 2: Geodynamic model.
From: Contemporaneous mobile- and stagnant-lid tectonics on the Hadean Earth
Geodynamic model of early Earth evolution37. 2a. Mobility, i.e., the ratio of root mean square (RMS) of surface velocity and RMS of velocity of the entire mantle over time with a moving average (thick line) over 11 mobility values (thin lines). A value of mobility above one indicates subduction activity. 2b,c. The rate and mass of granitic continental crust (TTG) generated over time, respectively, the latter scaled with the present-day continental crust mass (CCM). 2d,e,f and g. Snapshots of Earth’s cross-section showing the modeled evolution with time, where the two quadrants represent different fields (left: composition, right: viscosity). The color scales for each field are shown in d. Figures d and f show periods of active subduction, while Figures e and g show lulls in subduction activity where large mantle plumes (dark blue in the viscosity field) are trapped beneath cold recycled material (yellow in the viscosity field). The magnified inset from d shows subduction beneath proto-continental crust in the Early Hadean.
