Preliminary results On the detection of mantle plumes by wavelet variances of the gravity field M. Klug, H. Schmeling, W. Freeden, O. Cadek Project 6.7 Mantle plumes and the geoid

Synthetic mantle convection models Solve equations of mass, momentum, energy Axisymmetric spherical Viscosity jump (x30) at 660 km Internally heated (chondr) T = 3000 K at bottom  Plume at pole Project 6.7 Mantle plumes and the geoid

Synthetic plume models  Plume time dependent 500 Ma 660 Ma 1 Ga 2.3 Ga 3 Ga 4 Ga 4.5 Ga1.5 Ga Project 6.7 Mantle plumes and the geoid

-  N thermal  N dyn-topo Dynamic topo +

-  N dyn-topo  N thermal  N total  Plume signal varies with time, depending on plume stage Project 6.7 Mantle plumes and the geoid

Plume signals for different viscosity structures Project 6.7 Mantle plumes and the geoid Next steps analyse plume signal at different stages systematically distinguish plume classes

To be seen in gravity field? Geoid Gravity anomalies Project 6.7 Mantle plumes and the geoid Stong plumes

Analyse synthetic and observed signals by wavelets  Second part of presentation Project 6.7 Mantle plumes and the geoid

Hotspots, plumes of the earth (Steinberger, 2000) Size: estimated buoyancy mass flux of plumes in kg/s. Total: > kg/s