Crustal roots | M@TE

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Fast modeling results (1.8 cm.y-1 extension speed) at an average strain rate of 3e-15 s-1 and 25 % extension. Colors are the same as in Fig 2. Model a. Only partial melting is allowed (garnet-pyroxene isograde and retrogression into amphibolite are removed). Model b. Partial melting, crystallization of garnet-pyroxene assemblages and retrogression are allowed. The temperature for the transformation of the continental crust into garnet-pyroxene rich rocks is 777 °C (see text for explanation). The reference temperatures for the solidus of the continental crust and the garnet-pyroxene rich crust are 650 °C and 790 °C, respectively. Model c. Same as model b but the temperature for the continental crust solidus is increased to 720 °C. Model d. Zoom on model b illustrating the velocity field (black arrows) when the boundary condition mimicking extension is removed (after 2 Myr of gravity forces operating) showing that the partially molten crust flows while garnet-pyroxene rich rocks do not.

Fast modeling results (1.8 cm.y-1 extension speed) at an average strain rate of 3e-15 s-1 and 25 % extension. Colors are the same as in Fig 2. Model a. Only partial melting is allowed (garnet-pyroxene isograde and retrogression into amphibolite are removed). Model b. Partial melting, crystallization of garnet-pyroxene assemblages and retrogression are allowed. The temperature for the transformation of the continental crust into garnet-pyroxene rich rocks is 777 °C (see text for explanation). The reference temperatures for the solidus of the continental crust and the garnet-pyroxene rich crust are 650 °C and 790 °C, respectively. Model c. Same as model b but the temperature for the continental crust solidus is increased to 720 °C. Model d. Zoom on model b illustrating the velocity field (black arrows) when the boundary condition mimicking extension is removed (after 2 Myr of gravity forces operating) showing that the partially molten crust flows while garnet-pyroxene rich rocks do not.

Strain and retrogression partitioning explain long-term stability of crustal roots in stable continents

Uploaded by: Bénédicte Cenki-Tok or Cenki

Uploaded: October 28, 2024

Software: Underworld 2

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Finite Element Python crustal roots retrogression stability

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