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Partial melting

Partial melting. 3. Migmatites and melt extraction. Partially molten rocks. MELANOSOME = Residue. LEUCOSOME = Liquid = granitic magma. MESOSOME = Not melted. Qz. KF. Biot. Plg. Qz. KF. Biot. Plg. Metatexites Diatexites « Dirty » granites.

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Partial melting

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  1. Partial melting 3. Migmatites and melt extraction

  2. Partially molten rocks

  3. MELANOSOME = Residue LEUCOSOME = Liquid = granitic magma MESOSOME = Not melted

  4. Qz KF Biot Plg Qz KF Biot Plg

  5. Metatexites Diatexites « Dirty » granites

  6. Rhéologie des roches partiellement fondues

  7. Melt extraction

  8. Brown, 1994

  9. Melt depletion

  10. An experimental study of melt extraction J. Barraud, PhD 2000

  11. (Films)

  12. Films 2

  13. Evolution de la déformation 1) 5% de raccourcissement 2) 22% de raccourcissement

  14. 3) 30% de raccourcissement Zone de cisaillement Le pli devient asymétrique et un des flancs évolue en zone de cisaillement. 4) 36% de raccourcissement Bande de cisaillement La distribution hétérogène du liquide permet de localiser la déformation.

  15. Melt extraction: role of deformation

  16. Melting and migmatitic domes – migmatites in orogenic belts The Velay dome Burg et al., 1994

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