Extended Data Fig. 8: High-resolution geodynamic modeling results.
From: Internal structure of ultralow-velocity zones consistent with origin from a basal magma ocean
Snapshots of the temperature field (left column) and the residual buoyancy field (right column) for the case 1 (A, B), case 2 (C, D) and case 3 (E, F) after 1.4 Gyr. Case 1 is the reference case in which the initial density anomaly of the ULVZ layer ranges from 1.5 to 15%. Case 2 is the same as Case 1, expect that the initial density anomaly of the ULVZ layer ranges from 1.5 to 10%. Case 3 is the same as case 1 except that the ULVZ materials are intrinsically 100 times less viscous than the surrounding mantle. In the residual buoyancy panels, the inserted figures are zoomed in from the locations marked by the black box near the bottom of the model domain. Note that the density anomalies (represented by the residual buoyancy) with the ULVZ patches (zoomed in by the rectangle boxes) are more homogenized in case 2 (D) and case 3 (F) than in case 1 (B), whereas the large-scale structure are more similar in all cases.
