ppt models

Initial condition Initial weak-zone (L*D*W km; default 10*50*10) L D W Initial geothermal gradient Stratification NS Stratification PS Stratification REF Rheology Rotation angle (θ) Simple shear boundary conditions Draw of the domain rotation boundary condition, for a shearing model where θ is the rotation applied on the domain (in green). Example of the domain rotation boundary condition on the left and right faces. Simple shear experiment : Did the orientation of the shear zone make a differences due to boundaries conditions ? Pitch 15° 30° 45° 60° REF X PS NS X Simple shear flat REF stratification θ=30°. Simple shear flat REF stratification θ=45°. Simple shear flat REF stratification θ=60°. Simple shear flat PS stratification θ=15°. Simple shear flat PS stratification θ=30°. Simple shear flat PS stratification θ=30°, weak-zone (5*50*5 km). X ZU αU Transtension Draw of the pitch velocity boundary condition, U is the amplitude and αU is the angle of obliquity . Example of the pitch boundary condition on the left and right faces for αU= 60°. Boundary Navier-slip condition U⋅ ^ n=0 Λ=[ ^ n ^ t1] U t n ^ t1 ^ n Modified from Jourdon et al., 2025 Legend : Boundary condition : Dirichlet Navier-slip weak zone Model boundary condition Transtension experiment : Comparison at the 2Ma Extension Shearing Pitch 75° 60° 45° 30° REF X PS NS X Transtension experiment : Comparison at the 20Ma Extension Shearing Pitch 75° 60° 45° 30° REF X PS NS X Transtension experiment : Comparison ~50 km of extension Extension Shearing Pitch 75° 60° 45° 30° REF X PS NS X 20Ma 10Ma 7Ma 6Ma Transtension experiment : Comparison ~100km of shearing Extension Shearing Pitch 75° 60° 45° 30° REF X PS NS X 10Ma 11Ma 13Ma 20Ma Mafic crust Mantle 15 Ma 20 Ma 2 Ma 10 Ma Transtension flat REF stratification, αU= 60° (link : TT 60°). Mafic crust Mantle 15 Ma 20 Ma 2 Ma 10 Ma Transtension flat REF stratification, αU= 45°. Transtension flat REF stratification, αU= 30°. Mafic crust Mantle 15 Ma 20 Ma 2 Ma 10 Ma Sediments Felsic crust Mafic crust Mantle 15 Ma 20 Ma 2 Ma 10 Ma Transtension flat PS stratification, αU= 75° (link : TT 75°). Impact of the weakzone amplitude and healing on 60° transtension PS It change the global dynamic by relocalizing a shear zone and change the shape of the dome Healing rate = 1.5e-15 Healing rate = 1e-15 A = 1 A = 0.2 X default Transtension flat PS stratification, αU= 30°, A = 1, healing rate 1e-15. Sediments Felsic crust Mafic crust Mantle 15 Ma 20 Ma 2 Ma 10 Ma Transtension flat PS stratification, αU= 60°, A = 0.2, healing rate 1e-15. Sediments Felsic crust Mafic crust Mantle 15 Ma 20 Ma 2 Ma 10 Ma